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Hadrian - Manufacturing the Future Hadrian is building autonomous factories that help aerospace and defense companies manufacture rockets, satellites, jets, and ships up to 10x faster and up to 2x cheaper. By combining advanced software, robotics, and full-stack manufacturing, we are reinventing how America produces its most critical parts. We're accelerating our mission with the launch of Factory 3 in Mesa, Arizona, a 290,000-square-foot facility creating 350 new jobs. We are expanding rapidly to support thousands of future hires, launching Hadrian Maritime to expand into naval production, and introducing a Factory-as-a-Service model that delivers complete systems instead of individual parts. Hadrian is backed by leading investors including T. Rowe Price, Lux Capital, Founders Fund, and Andreessen Horowitz, our fast-growing team is united around reindustrializing American manufacturing for the 21st century and beyond. The Role We are hiring an Automation Engineer, NDT to design and deploy automation for advanced NDT inspection cells across UT, VT, RT, and CT. This is an end-to-end automation role for someone who has direct experience building inspection capability in the real world. You will own robot / motion paths, sensor integration, acquisition timing, station sequencing, operator UX, data traceability, safety, and production commissioning. You will partner with certified NDT personnel and Quality on method validation, acceptance criteria, and audit evidence. This is not an NDT technician role and not a generic controls role. We are looking for someone who has personally designed, deployed, or commissioned automated inspection / NDT systems and knows what breaks when those systems hit production. What You'll Do \n • Design and deploy automated inspection cells for advanced NDT methods including ultrasonic testing (UT), visual testing / visual inspection (VT), radiographic testing (RT), and computed tomography (CT).\n, • Own the cell automation stack: robot / motion path, sensor integration, deterministic triggering, acquisition PC, sequencer, HMI / operator UX, data logging, and production handoff.\n, • Plan scan / inspection paths that balance coverage, probability of detection, cycle time, kinematics, collision risk, and operator workflow.\n, • Integrate modality-specific hardware: phased-array UT probes, cameras / lighting / optics, digital radiography sources and detectors, CT turntables / reconstruction flows, and related acquisition systems.\n, • Partner with certified NDT personnel and Quality to validate methods against applicable standards and customer requirements.\n, • Build structured inspection data pipelines for SPC, traceability, customer handoff, and archival.\n, • Own station safety with EHS: radiation for RT / CT, laser / lighting for VT, couplant / water / ergonomics for UT, collision and LOTO for all modalities.\n, • Commission on the floor, debug drift / escapes / false calls / timing issues, and hold the line when inspection blocks production.\n, • Qualify vendors and integrators; write acceptance tests, red-line designs, and keep suppliers honest.\n, • Codify reusable inspection automation patterns so the next station inherits a platform instead of a one-off science project.\n\n What We're Looking For \n • 3+ years designing, deploying, or commissioning automated inspection / NDT systems in production or high-reliability environments.\n, • Direct ownership of at least one automated inspection station involving robot / motion, sensor acquisition, station sequencing, data logging, and acceptance / production handoff.\n, • Deep practical experience in at least one advanced NDT modality: \n • UT: phased-array, TFM / FMC, encoded scanning, robotic scan paths, couplant handling.\n, • VT: 2D / 3D / multispectral vision, lighting, optics, calibration, dimensional / cosmetic inspection, gauge R&R.\n, • RT: digital radiography, source / detector integration, shielding, interlocks, radiation safety.\n, • CT: turntable / positioning, reconstruction pipeline, volumetric analysis, large-data workflow.\n\n\n, • Measurement rigor: MSA / gauge R&R, POD / ROC where applicable, uncertainty, acceptance criteria, and audit-ready evidence.\n, • Working knowledge of robot / motion systems and industrial controls such as Fanuc, ABB, Kuka, Yaskawa, Beckhoff TwinCAT, or Siemens TIA.\n, • Comfort debugging across mechanical, controls, acquisition, software, data, Quality, and operator workflows.\n, • Bachelor's degree in EE, ME, Mechatronics, Robotics, Physics, Materials, or related STEM, or equivalent direct experience.\n, • ITAR eligible.\n\n What Will Set You Apart \n • Radiation safety officer / state radiation safety training for RT / CT.\n, • GD&T, CMM, metrology, or dimensional inspection background.\n, • Python or C# for acquisition glue, vendor SDK wrappers, data processing, or inspection automation tooling.\n, • Experience with inspecting to industry standards such as NAS 410, SNT-TC-1A, ASTM, AWS D1.x, MIL-STD, NAVSEA, or customer-specific aerospace / defense inspection requirements.\n, • Experience designing and deploying automation into production.\n, • Offline robot programming and simulation experience with RoboDK, Process Simulate, Visual Components, or native robot tools.\n, • Production experience in aerospace, defense, medical, power generation, nuclear, or shipbuilding environments where customers audit inspection methods.\n, • Experience turning one-off inspection stations into reusable platforms: calibration workflows, scan-path templates, fixture standards, data schemas, and acceptance tests.\n\n Compensation $145,000 - $230,000 (actual range may vary based on experience) This range reflects what we reasonably expect to pay at the time of posting. Compensation depends on education, experience, skills, location, performance, and business needs. Benefits for Full-time Employees \n • Medical, dental, vision, and life insurance plans for employees\n, • 401k\n, • Relocation support may be provided for certain situations, based on business need.\n, • Flexible vacation policy\n\n ITAR Requirements To conform to U.S. Government space technology export regulations, including the International Traffic in Arms Regulations (ITAR) you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State. Learn more about the ITAR here . Hadrian Is An Equal Opportunity Employer It is the Company's policy to provide equal employment opportunity for all applicants and employees. The Company does not unlawfully discriminate on the basis of race inclusive of traits historically associated with race (including, but not limited to, hair texture and protective hairstyles, such as braids, locks and twists), color, religion, sex (including pregnancy, childbirth, or related medical conditions), gender identity, gender expression, transgender status, national origin (including, in California, possession of a drivers license), ancestry, citizenship, age, physical or mental disability, height or weight, medical condition, family care status, military or veteran status, marital status, domestic partner status, sexual orientation, genetic information, exercise of reproductive rights, any other basis protected by local, state, or federal laws, or any combination of the above characteristics. When necessary, the Company also makes reasonable accommodations for disabled candidates and employees, including for candidates or employees who are disabled by pregnancy, childbirth, or related medical conditions.

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Our Chief Financial Officer is looking for a dynamic and expert Executive Assistant to join us on an exciting journey. This is a high-exposure role that demands a high-performing and radically optimistic individual. You will be managing relationships with our investors, advisors, government partners, allies and more. You’ll work closely with our C-suite daily, owning their calendars, internal/external relationships and meetings, briefings, travel, and various other responsibilities. You'll get intimately familiar with what it means to be a founder and executive of a growing clean energy technology startup. This role offers expansive responsibility, ownership, and growth opportunities, optimizing our executives' impact as we scale to mass-production of Kaleidos. Responsibilities & Duties: Build trust and rapport with the C-suite, their senior leadership, and Board of Directors, with the ability to influence and negotiate when necessary. Anticipate C-suite needs and potential conflicts and handle independently or pull together the right stakeholders to resolve quickly. Manage daily schedules, coordinate logistics for all meetings, both internal and external, being proactive about conflicts and understanding priorities for the C-suite. Draft and edit emails, memos, and other communications on behalf of the C-suite. Triage and prioritize asks from internal team members and external partners. Schedule and coordinate logistics for speaking engagements, conferences, or other special events, onsite and offsite. Work cross-functionally to ensure communication is efficient and clear between teams. Ensure the C-suite is equipped with the necessary technology and support, coordinating with IT for any technical needs or issues. Create, scale and own processes for the executive office. Exercise strong judgment and discretion with highly confidential information. Handle administrative tasks such as ordering lunch, planning business travel, processing expenses, time checks for meetings, note-taking at meetings, etc. Provide occasional executive assistant support to VP-level leaders Required Qualifications & Skills: Bachelor’s degree in business administration, communications, or a related field preferred. 5+ years of experience supporting one or more C-level executives in a high-growth, fast-paced environment. Ability to anticipate the needs of C-level executives and address them proactively. Laser-focused organizational skills, with a strong ability to juggle multiple tasks and priorities seamlessly without sacrificing quality. Exceptional written and verbal communication skills, including the ability to tailor succinct communication for various audiences, respond promptly across multiple platforms (Slack, Outlook, text/phone), and digest large amounts of information to take action. Expert at building relationships across all levels of the organization and external partners, providing excellent service to internal and external stakeholders, ensuring positive interactions. Strategic thinking with a keen eye for detail and problem-solving. Advanced proficiency in office software (e.g., Microsoft Office Suite, Google Workspace) and collaboration tools (e.g., Slack, Zoom, Smartsheet) and adept at adopting new technologies. Discretion and confidentiality. Desired Qualifications & Skills: Prior Executive Assistant experience in a hardware or software engineering startup, finance, or goods and services distribution is strongly preferred. Autonomous, entrepreneurial, and self-motivated – you don’t wait for someone to tell you what to do because you’ve already done it. Intellectually curious and ambitious – excited to learn about our technology, grow our business, and advance your career at Radiant. High level of professionalism, integrity, and reliability, with a commitment to upholding the company’s values and reputation. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $115K - $162K

The Opportunity: Glumac, a Tetra Tech company, is seeking a Commissioning Authority to join our world-class Data Center Commissioning Team. This is a unique opportunity to be part of a global leader in the construction space and get hands-on experience with Data Center projects in addition to exposure across all project types. Position Summary: Commissioning is a quality assurance process that is invaluable to building and infrastructure owners, ensuring that systems and components are installed and operate as intended. This role will give you a chance to experience work both in the office and in the field with hands-on testing of a range of systems improving building performance, energy efficiency, reliability, and occupant comfort. The Glumac Commissioning Team is a dedicated team of professionals focused exclusively on providing the highest quality commissioning services. Currently, we have over 30 full-time commissioning staff working on world-class projects, including LEED Cx, Title 24 Cx, retro-commissioning, energy studies, measurement and verification, ongoing commissioning, etc. We work with our clients from design to move-in and beyond, bringing together the owner, design team, contractors, and building operators to support and achieve the project goals. As a Data Center Commissioning Authority, you will lead and manage the commissioning process for assigned projects, including conducting field functional testing, creating checklists, documenting test results, and maintaining issue logs and reports. You will also participate in meetings, support project management tasks, follow internal procedures and industry standards, ensure safe work practices, and stay current through ongoing professional development. Essential Job Functions: The following duties are considered essential to the role. Reasonable accommodations may be made to enable individuals with disabilities to perform these essential functions: Conduct field functional testing. Create pre-functional and functional checklists. Lead commissioning meetings and manage the commissioning process for assigned projects. Perform field observations and document test results. Maintain issue resolution logs and compile commissioning reports. Assist with project management duties as needed. Conduct activities in line with internal procedures, legislation, and industry standards. Pursue continuous professional development and maintain a high degree of discipline knowledge and awareness. Work in a safe manner at all times and report all health and safety incidents and concerns. Additional duties as required. Required Qualifications: A Bachelor's or advanced degree in engineering or a related field, or industry commensurate experience. 8+ years of related industry experience and 2+ years of experience in datacenter commissioning, operations, or construction. ANSI/ISO Accreditation Cx Certification (BCxA CCP, ACG CxA, ASHRAE BCxP). Strong technical knowledge of datacenter MEP system design and operation, controls, and instrumentation. Project management expertise, including scheduling, budgeting, and resource planning. Exceptional client-facing, client relationship, and client management skills. Ability to work autonomously and in team environments. Outstanding written and verbal communication abilities. Proficiency in MS Office. Safety first mindset. Ability to climb ladders/stairs and lift/carry loads above 20 lbs. Ability to be on a job site for extended periods (8-10 hours). Willingness and ability to travel as needed, approximately 50%. Valid driver's license and insurance. Preferred Qualifications: Professional licensure (PE license, Energy Management, or TAB certifications) is a plus. Ability to manage QA/QC processes. Electrical systems commissioning experience. Experience with commissioning software or ongoing commissioning tools. Candidates with commensurate experience gained from military service will be considered and are highly encouraged to apply. Experience gained from military service maintaining, operating and/or testing nuclear power or other power systems. This includes power systems, battery systems, steam generation, hydroelectric plants, medium voltage distribution, and more. Experience gained in commissioning, testing, or quality assurance of medium voltage power systems that include power plants, solar, electric vehicle charging, critical power systems, and more. Work Environment and Location: This position requires regular travel to data center project sites, with 50-70% travel expected. Our hybrid work environment requires two in-office and/or on-site days per week. All candidates must be located in and eligible to work in the U.S. Compensation: Salary Range: $110,000 - $180,000 (depending on experience) The base salary range represents the low and high end of the compensation scale for this role. Actual salaries will be determined based on location, experience, responsibilities, and qualifications. This salary range is just one component of Glumac's total compensation package, which includes benefits, professional development opportunities, and additional incentives. Why Glumac, a Tetra Tech Company: Glumac has been a leader in the sustainable building design industry for over 50 years. In 2017 we joined Tetra Tech, enabling us to combine our expertise with the reach and resources of a prestigious global organization. At Tetra Tech, we are Leading with Science to solve the world's most complex challenges. Our industry-leading experts in engineering and consulting are committed to driving positive change in communities around the world. For nearly 60 years, we have been at the forefront of innovation and sustainability. Today we stand as a market leader, offering cutting-edge solutions in water, environment, energy, and international development. Our work has improved more than 625 million lives around the world. Your Impact: Join Glumac, a Tetra Tech company, to make a real difference. Our work leverages cutting-edge technologies, advanced analytics, and the expertise of world-class scientists and engineers to create meaningful change around the world. Discover your full potential - join us to advance your career while leaving a lasting legacy. Life at Glumac, a Tetra Tech Company: The perks of working at Glumac, a Tetra Tech company, include: Comprehensive and market-competitive benefits. Merit-based financial rewards. Flexibility and company-wide commitment to work/life balance. Collaborative team atmosphere that values the contributions of all employees. Learning and development opportunities for ongoing professional growth. About Tetra Tech: Tetra Tech is the leader in water, environment, and sustainable infrastructure, providing high-end consulting and engineering services for projects worldwide. Our 25,000 employees work together to provide clear solutions to complex problems by Leading with Science to address the entire water cycle, protect and restore the environment, design sustainable and resilient infrastructure, and support the clean energy transition. Tetra Tech is proud to be an Equal Opportunity Employer. All qualified candidates will be considered without regard to race, color, religion, national origin, age, disability, sex, marital or familial status, status as a protected veteran, or any other characteristic protected by law. Tetra Tech is a VEVRAA federal contractor and we request priority referral of veterans. We invite applications from all interested parties. Additional Information Organization: 150 GTT

Job DescriptionAbout Terawatt Infrastructure The once in a century transition to autonomous and electric vehicles is underway and will require a multi-trillion-dollar investment in energy and charging infrastructure, and the real estate to site it on. Terawatt is the leader in delivering large scale, turnkey charging solutions for companies rapidly deploying AV and EV fleets. Whether it’s an urban mobility hub, or a carefully located multi-fleet hub for semi-trucks, Terawatt brings the talent, capabilities, and capital to create reliable, cost-effective solutions for customers on the leading edge of the transition to the next generation of transport. With a growing portfolio of sites across the US in urban hubs and along key logistics and transportation corridors and logistics hubs, Terawatt is building the permanent transportation and logistics infrastructure of tomorrow through a robust combination of capital, real estate, development, and site operations solutions. The company develops, finances, owns, and operates charging solutions that take the cost and complexity out of electrifying fleets. At Terawatt, we execute humbly and with urgency to provide tailored solutions for fleets that delight our clients and support the transition of transportation. Role Description:One of Terawatt’s Core Values is “Electrify the Customer.” Terawatt is seeking an Electrical Engineer to help design and deliver reliable, high-performance EV charging solutions across North America. This role plays a key part in shaping the electrical strategy for Terawatt’s charging stations and ensuring efficient, scalable site design. In this role, you will contribute to strategic electrical system analysis, submittal reviews, preliminary single-line diagram development, and utility coordination. You will collaborate with utility partners and vendors to deliver power efficiency solutions using both established and emerging technologies. You will work closely with the Head of Hardware & Electrical Systems, the SVP of Technology, EVSE Validation Engineers, and a Senior Electrical Engineer, while partnering cross-functionally with software, data, development, construction, energy, and operations teams. This position is central to delivering a high-quality charging experience for fleet customers. The team ensures that Terawatt’s selected charging systems achieve high uptime while providing a seamless customer experience. If you bring experience in EVSEs and high-powered electrical systems, this role offers an opportunity to contribute meaningfully to transportation electrification and the reduction of greenhouse gas emissions.Core Responsibilities • Work with the Development, Construction, Energy teams to implement electrical hardware and utility partner requirements closely, • Work with Technology team to help determine hardware partners for Terawatt’s charging sites, • Execute strategies for interoperability for our different EVSE partners and the vehicles that will use our charging infrastructure, • Work with Field Service to help resolve hardware and electrical-related problems for Terawatt's fleet customers, • Work on existing and upcoming standards engagements and compliance, • Assist Sr. team members identify new solutions to improve the efficiency of our sites, • Manage engineering outputs for multiple projects with competing deadlines and resources, • Report to management regularly on engineering progress and setbacks, • Research, obtain, and apply critical design information including building and electrical code requirements to site design, • Be an advocate for the electrification of transport, and the Company’s role in making it happenMinimum Qualifications, • Background in electrical engineering, power electronics, or comparable practical experience, • 4+ years experience in dense electrical infrastructure, such as: DC fast EV charging infrastructure, Clean energy electrification (BESS, solar, wind, geothermal, nuclear, etc.), Data center power distribution, Power grid development, Substations and Microgrids, Solid state power transformation, • Demonstrated initiative and a collaborative approach to solving complex challenges in an evolving industry with the ability to manage technical deliverables for multiple simultaneous projects, maintaining high quality under aggressive "speed-to-market" timelines, • Proficiency in developing and reviewing Single-Line Diagrams (SLDs) and Three-Line Diagrams using AutoCAD, Bluebeam, or similar engineering software, • Deep familiarity with the National Electrical Code (NEC) and local building codes relevant to EV infrastructure, • Demonstrated experience managing utility interconnection applications and navigating the technical requirements of utility service providersPreferred Qualifications, • 2+ years experience in the EV ecosystem, vehicle electrification, EV charging infrastructure, or related fields, • Hands-on experience in construction oversight, commissioning, or field engineering, specifically troubleshooting hardware to vehicle interoperability, • Familiarity with understanding of dispatchable on-site power generation, solid state transformers, substation relay and control and other aspects of power distribution systems, • Understanding of industry standards such as OCPP (Open Charge Point Protocol) and ISO 15118 (Plug & Charge), • Knowledge of construction and electrical safety practices and procedures, • EIT (Engineer-in-Training) status or a Professional Engineer (PE) licenseCompensation for this role is determined by several factors, including the cost of labor in specific geographic markets, and these ranges are intended to provide a helpful reference. The actual compensation offer will be based on the candidate’s location, skills, level of expertise and experience, and internal equity considerations. In addition to base salary, we offer a comprehensive benefits package and, where applicable, performance-based incentives.We are building a team that represents a variety of backgrounds, perspectives, and skills. At Terawatt, we continuously strive to foster inclusion, humility, energizing relationships, and belonging, and welcome new ideas. We're growing and want you to grow with us. We encourage people from all backgrounds to apply.If a reasonable accommodation is required to fully participate in the job application or interview process, or to perform the essential functions of the position, please contact people@terawattinfrastructure.com. Terawatt Infrastructure is an equal-opportunity employer. We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role As a Technical Program Manager in Radiant’s Commercial organization, your job is to deliver reactors to our contracted customers. You will own the end-to-end process, serving as the single point of accountability from contract award through reactor delivery. You will work with the customer’s site team, ensure compliance with contract requirements, and manage the project from local permitting through electrical interconnection. Within Radiant, your key points of contact will be the licensing, state engagement, engineering, and manufacturing teams. The projects you manage will be successful if they are delivered on time and on budget. Responsibilities & Duties: Ensure the successful delivery of projects under contract for deployment at government and commercial customer sites. Manage the timely execution of regulatory, engineering, and siting deliverables. Drive contract milestones to completion. Own deliverable creation and partner across the team where support is necessary. When working with our government customers, act as the primary interface with contracting officers, program offices, installation personnel, and end users. When working with our commercial customers, act as the primary interface with project sponsors, site leads, and operations personnel. Architect and maintain integrated master schedules and cost baselines, ensuring internal teams and subcontractors are aligned to contract obligations. Manage contract compliance including reporting requirements and milestone billing; support negotiation of contract modifications and change orders. Independently identify, assess, and drive resolution of programmatic risks and cross-functional dependencies. Stand up and refine the project management processes, tools, and reporting cadence needed to provide clear visibility to company leadership and consistent milestone updates to customer partners. Required Qualifications & Skills: 3-5+ years of experience in energy project development, project management, or a related field. Experience managing programs requiring the delivery of complex capital equipment or large scale industrial systems. Strong command of integrated master scheduling. Proven ability to manage programs with significant technical complexity, multiple parallel work streams, and cross-functional dependencies. Demonstrated experience managing and reporting project financial performance, budgets, scopes, and schedules. U.S. citizenship required (absolutely no exceptions); ability to obtain and maintain a security clearance. Ability to travel ~10-20%. Desired Qualifications & Skills: Familiarity with electric power infrastructure projects and knowledge of business issues associated with power delivery services. Experience supporting U.S. government contracts. Direct working knowledge of FAR/DFARS compliance, government contract types (cost-plus, firm-fixed-price, time and materials), and federal reporting and audit requirements. Active DoD security clearance. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $115K - $168K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a proactive and strategic Supply Chain Manager to manage the sourcing, negotiation, and acquisition of components, materials, and services necessary for our innovative micro-reactor systems. This role is crucial in building and maintaining a resilient, cost-effective, and reliable supply base. You will work closely alongside our Supplier Development Engineers (SDEs), Engineering, Quality Assurance, and Operations teams to ensure suppliers meet not only stringent quality and technical requirements but also commercial and delivery expectations. The ideal candidate thrives in a fast-paced environment, possesses strong negotiation skills, and understands the complexities of sourcing within regulated industries. Responsibilities & Duties: Strategic Sourcing: Identify, evaluate, and select potential suppliers based on cost, quality, reliability, capacity, and strategic fit, in collaboration with SDE and Engineering teams. Negotiation: Lead commercial negotiation ns for pricing, payment terms, lead times, and other key contract terms to achieve optimal value for Radiant. Contract Management: Develop, review, and manage supplier agreements, including Master Supply Agreements (MSAs), Non-Disclosure Agreements (NDAs), and Purchase Order terms and conditions. Purchase Order Management: Oversee the complete purchase order lifecycle, from requisition review and PO placement to tracking, expediting, and closure, ensuring timely delivery of goods and services. Supplier Relationship Management: Build and maintain strong commercial relationships with key suppliers, acting as a primary point of contact for contractual and commercial matters. Cost Analysis & Optimization: Analyze market trends, supplier quotations, and total cost of ownership to identify cost-saving opportunities and drive cost reduction initiatives. Risk Management: Assess and mitigate commercial and supply chain risks, including supplier financial health, capacity constraints, and geopolitical factors. Performance Monitoring: Track and report on key procurement metrics, such as on-time delivery, cost savings, purchase price variance, and supplier responsiveness. Collaborate with SDEs on holistic supplier performance scorecards. Cross-functional Collaboration: Work seamlessly with SDEs to integrate technical and quality requirements into the sourcing and procurement process. Liaise with Engineering, Quality, and Project Management to understand needs, resolve supply issues, and support program timelines. Process Improvement: Contribute to the development and refinement of procurement policies, procedures, and systems to enhance efficiency and compliance. Deliverables: Successfully negotiated contracts and favorable terms with critical suppliers. Managed portfolio of purchase orders ensuring on-time delivery aligned with project schedules. Demonstrated cost savings and avoidance through effective negotiation and sourcing strategies. Comprehensive supplier performance reports focusing on commercial and delivery metrics. Effective mitigation plans for identified supply chain risks. Streamlined procurement processes supporting Radiant's operational needs. Strong collaborative relationships established internally (SDE, Eng, QA, Operations) and externally (suppliers). Required Qualifications & Skills: Bachelor’s degree in Supply Chain Management, Business Administration, Engineering, or a related field. 3–8 years of relevant experience in procurement, strategic sourcing, or supply chain management, preferably within manufacturing or technology sectors. Proven track record of successful negotiation and contract management. Strong understanding of procurement processes (e.g., RFQ/RFP, PO management, supplier evaluation). Excellent analytical, organizational, and problem-solving skills. Strong interpersonal and communication skills (written and verbal). Proficiency with ERP/MRP systems and standard office software Ability and willingness to travel occasionally to supplier locations (up to 30%). Desired Qualifications & Skills: Experience in the nuclear energy industry or working with nuclear codes, standards, and regulations. Familiarity with NQA-1, 10 CFR 50 Appendix B, 10 CFR 21, ASME BPVC Section III & VIII. Experience conducting supplier audits, product and process inspections, and investigations. Familiarity with quality management systems (e.g., ISO 9001, AS9100) and their implications for procurement. Understanding of supply chain dynamics within the energy or nuclear sector. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $85.5K - $168K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a highly motivated Mechanical Engineer, Fluids Systems to help own critical Kaleidos fluid systems from preliminary design through build and production. These systems include the primary loop subsystems and power conversion loop, serving to convert heat from the reactor core into electrical power. You will be responsible for the following: trade studies, component selection, thermal hydraulic analysis, piping design, vendor selection, assembly, and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026. Responsibilities & Duties: Help own end-to-end engineering of fluid systems and components, including compressors, valves, and heat exchangers. Perform thermal and fluids analysis to drive design decisions, verify system performance, and ensure structural integrity using first-principle hand calculations and finite element tools. Perform trade studies to optimize system and meet program requirements. Develop and execute manufacturing/assembly instructions and test plans. Create and manage a Bill-Of-Materials (BOM). Find and develop suppliers for all components. Own subassembly design, manufacturing, and test schedules. Own risk analysis (FMEA) for subsystems. Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication. Required Qualifications & Skills: Bachelor’s degree from an accredited institution in Mechanical, Materials, Aeronautical, Civil or Structural Engineering. Experience with fluid system architecture design. Experience in designing, building, and testing fluids systems. Proficient knowledge in fluid dynamics and thermodynamics. Proficient knowledge of heat exchanger design and analysis methods. Desired Qualifications & Skills: Knowledge of thermodynamic power cycles. Prior experience with fluid system modeling via Matlab/Python. Experienced in design for manufacturability and ramping up hardware build in a production environment. Experienced in designing and operating test stands. Takes extreme ownership of work and a high degree of responsibility. Excellent communication across multidisciplinary teams. Prior nuclear experience in not required for this role. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $105K - $125K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a highly motivated Senior Mechanical Engineer to own critical Kaleidos fluid systems from preliminary design through build and production. These systems include the primary loop subsystems and power conversion loop, serving to convert heat from the reactor core into electrical power. You will be responsible for the following: trade studies, component selection, thermal hydraulic analysis, piping design, vendor selection, assembly, and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026. Responsibilities & Duties: Own end-to-end engineering of fluid systems and components, including compressors, valves, and heat exchangers. Perform complex thermal and fluids analysis to drive design decisions, verify system performance, and ensure structural integrity using first-principle hand calculations and finite element tools. Perform trade studies to optimize system and meet program requirements. Develop and execute manufacturing/assembly instructions and test plans. Create and manage a Bill-Of-Materials (BOM). Find and develop suppliers for all components. Own subassembly design, manufacturing, and test schedules. Own risk analysis (FMEA) for subsystems. Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication. Required Qualifications & Skills : Bachelor’s degree from an accredited institution in Mechanical, Materials, Aeronautical, Civil or Structural Engineering. Experience with fluid system architecture design. 4+ years of experience in designing, building, and testing fluids systems. Proficient knowledge in fluid dynamics and thermodynamics. Proficient knowledge of heat exchanger design and analysis methods. Desired Qualifications & Skills : Knowledge of thermodynamic power cycles. Prior experience with designing piping system for thermal growth using hand calculations and FEA tools. Experience with process piping design and testing codes, such as ASME B31.3 and ASME PCC-2. Prior experience with fluid system modeling via Matlab/Python. Experienced in design for manufacturability and ramping up hardware build in a production environment. Experienced in designing and operating test stands. Takes extreme ownership of work and a high degree of responsibility. Excellent communication across multidisciplinary teams. Prior nuclear experience in not required for this role. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $158,000 - $219,450

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a highly motivated Senior Manufacturing Engineer who will be working closely with design engineers to innovate on the production of complex mechanisms and structures critical to our microreactor technology. You will ensure reliable, safe, quality, and delivery of the Kaleidos demonstration unit that will test in 2026 at the Idaho National Lab and be instrumental to testing the first new reactor design in over 50 years. Responsibilities & Duties: Responsible for the manufacturing and inspection process for critical components and assemblies within the Kaleidos microreactor. Partner with design engineers to develop innovative production methods for complex mechanisms and structures. Develop, qualify, and refine manufacturing processes to meet all design and business requirements including safety, quality, efficiency, and delivery. Develop and execute manufacturing specifications and fabrication instructions. Manage manufacturing bill-of-materials (mBOM) for components and assemblies. Identify and develop appropriate suppliers for component sourcing and fabrication. Identify, plan, and execute capital equipment, machine, and layout upgrades to meet evolving production requirements. Drive initiatives for continuous improvement in manufacturing processes and product quality. Required Qualifications & Skills: Bachelor’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline. 4+ years of experience with manufacturing of mechanical products in a production environment, preferably in high-tech or energy sectors. Desired Qualifications & Skills: Master’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline. Experience with machining and ancillary operations such as milling, turning, grinding, EDM of materials. Experience with interpreting engineering drawings and models, Geometric Dimensioning & Tolerancing (GD&T). Experience with inspection systems including manual gauges and coordinate-measuring machine (CMM). Experience with non-destructive testing/non-destructive evaluation (e.g. fluorescent penetrant inspection, radiography, eddy current). Experience with custom machine design; electromechanical systems, motors, actuators, linear rails, bearings, lifting/rigging, etc. Experience with design of multi-component assemblies in CAD (NX or similar). Strong problem-solving skills and attention to detail. Self-motivated with strong organizational, written, and oral communication skills. Demonstrated ability to work collaboratively with design and operations teams. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $133.5K - $184.8K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Systems Engineer to develop, maintain, and govern engineering design standards, requirements, and verification methodologies for the mass production of nuclear reactors. This role bridges systems engineering, design, analysis, manufacturing, and operations. As a Systems Engineer, you will be responsible for ensuring that hardware and concepts of operation meet requirements and are designed in accordance with Radiant standards. In short, you’ll be the glue between our analysis, test, certification, and design teams, helping to connect the technical dots and solve problems across our reactor designs. Responsibilities & Duties: Develop, own, and continuously improve design criteria, standards, and requirements for reactor core, structures, fluid systems, electronics, and shielding. Provide critical peer review and approval of hardware designs during design reviews; confirm acceptance and qualification test campaigns. Engage with Engineering to drive optimized designs while shepherding them through the design review process, verification testing, and part release. Guide engineers through the Radiant design process and ensure design criteria/requirements are being followed for reactor design, manufacturing, and test activities. Collaborate with responsible engineers throughout the entire design process, ensuring design criteria are properly considered in the development of hardware. Required Qualifications & Skills: Bachelor’s degree in engineering (mechanical, aerospace, systems, or related). 2+ years of experience in engineering design, analysis, or systems engineering. Experience in manufacturing or production environments. Excellent communication and documentation skills. Desired Qualifications & Skills: Advanced degree in an engineering discipline. Experience with requirements management tools (e.g., DOORS, Jama, Flow). Strong understanding of the system design process including interface control and tradeoffs. Familiarity with structural, thermal, and fluid systems. 5+ years professional experience in an engineering role (design, analysis, test, or manufacturing. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $133,500 - $190,050

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Mechanical Engineer to support the design and integration of electrical components and subsystems in a fast-paced startup environment. You’ll work alongside experienced mechanical and electrical engineers to solve challenging problems in packaging, thermal management, structural design, and system integration for advanced hardware. This role offers hands-on exposure to end-to-end hardware development from CAD and analysis through build, test, and validation. While contributing directly to Radiant’s mission to deploy the first successfully fueled commercial reactor in over 50 years by 2026. Responsibilities & Duties: Support the mechanical design and ownership of electrical components and subsystems, including: Mechanical design of electrical assemblies such as control panels, enclosures, brackets, mounts, and supports. Cable and wiring harness routing, retention, strain relief, bend radius compliance, and serviceability considerations. Packaging of sensors, actuators, connectors, and electrical hardware within constrained assemblies. 3D CAD modeling and 2D drawing creation using Siemens NX, including tolerance stack-ups and GD&T basics. Perform first-order load calculations (static, shock, vibration) to support structural design decisions. Conduct thermal analysis and heat-transfer assessments for electrical components, enclosures, and assemblies. Support selection of materials, fasteners, and finishes appropriate for electrical, thermal, and environmental requirements. Assist in the design and setup of test fixtures and test stands for acceptance and qualification testing. Participate in system integration, troubleshooting, and validation activities alongside electrical and systems engineers. Collect and interpret technical requirements and provide clear, constructive feedback across mechanical, electrical, software, and systems disciplines. Develop, document, and execute basic test plans and procedures to verify mechanical and thermal performance. Perform trade studies and first-order analyses to evaluate design options and constraints. Generate and maintain design documentation to support Design for Manufacturing (DFM), assembly, and serviceability. Support subassembly design, coordinate with manufacturing, and assist with build and test schedules. Required Qualifications & Skills: Bachelor’s degree in Mechanical Engineering or a closely related field from an accredited institution. 2+ Years of professional hands on mechanical design working experience. Experience using Siemens NX or similar 3D CAD tools. Familiarity with mechanical design of electrical assemblies, including enclosures, brackets, and harness routing principles. Basic understanding of structural mechanics, load paths, and first-order stress calculations. Introductory knowledge of thermal analysis, heat transfer, and thermal management concepts. Ability to read and create mechanical drawings, including dimensions and tolerances. Strong communication skills and ability to collaborate in a multidisciplinary engineering environment. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $1 - $130,000

Job DescriptionOverview First Resonance builds the ION Factory OS — the operating system powering next-generation manufacturing for companies building rockets, satellites, eVTOLs, clean energy systems, robotics, and autonomous vehicles. We’ve invested heavily in forward-deployed engineers at the customer edge. Now we’re strengthening the hub. We’re hiring a Principal Platform Engineer to serve as a platform leader: someone with deep expertise in software infrastructure and architecture who has built and operated scaled, high-uptime systems. This person will help us scale our backend, raise our reliability and performance bar, and provide sharp technical judgment on infrastructure changes. What you’ll do Own platform architecture at scale: Evaluate and evolve our backend architecture to support growth in customers, data volume, and product surface area. Drive reliability and uptime: Establish and improve reliability practices (SLOs/SLIs, incident response, postmortems, on-call effectiveness, capacity planning). Performance leadership: Identify systemic performance bottlenecks; lead initiatives across databases, APIs, caching, async processing, and observability. Review and de-risk change: Provide fast, high-quality technical assessment of infrastructure proposals and incoming changes (internal and vendor-driven). Build leverage for the team: Create scalable primitives (libraries, patterns, tooling, platform services) that enable product and forward-deployed teams to ship faster with less risk. Operational excellence: Improve monitoring, alerting, dashboards, deployment safety, and rollback strategies. Mentor and set the technical bar: Coach engineers on architecture, operational maturity, and high-quality execution; lead by example through hands-on delivery. Partner cross-functionally: Work closely with Product, Security, and field-deployed engineers to balance edge/customer urgency with platform durability. What success looks like (first 90 days) Produce a clear, prioritized platform assessment: current-state risks, near-term hardening plan, and a 6–12 month scaling roadmap. Reduce risk on critical paths by improving observability (service health, latency/error budgets, key dashboards) and deployment safety. Lead at least one high-impact initiative that materially improves uptime, performance, or developer velocity. Minimum qualifications 8+ years of professional software engineering experience, with significant time owning backend/platform systems in production. Demonstrated experience building and operating high-availability, high-uptime services (including incident response and postmortem culture). Strong systems thinking across distributed systems, databases, caching, queues, APIs, and cloud infrastructure. Track record of leading large technical initiatives across teams or across a complex codebase. Excellent written and verbal communication; able to explain tradeoffs clearly and drive alignment. Preferred qualifications Prior experience as a Staff/Principal Engineer (or equivalent scope) at a high-scale infrastructure org. Depth in one or more of: SRE / reliability engineering, performance engineering, database scalability, multi-tenant architectures, zero-downtime migrations. Experience building internal platforms that enable other engineers (tooling, CI/CD, shared services, paved roads). Experience in or affinity for manufacturing, industrial software, or hard-tech customer environments. Benefits & Perks Health Insurance; medical, vision, dental, & life insurance. Paid Parental Leave. Employee Stock Option Plan. Team outings, group lunches, open office, happy hours. Paid holidays, sick days. Flexible Friday and PTO. 401K. First Resonance is an equal opportunity employer dedicated to building an inclusive and diverse workforce. First Resonance participates in E-Verify. As part of our onboarding process, a new hire's Form I-9 information will be shared with the federal government to confirm they are authorized to work in the U.S. Pay is based on factors such as (but not limited to) scope and responsibilities of the position, candidate's work experience and skillset, and location. First Resonance accelerates the speed and reliability of hardware development for companies manufacturing the next generation of hardware products. This includes space exploration, electric airplanes, autonomous vehicles, nuclear reactors, robotics, and more. We are a group of software, hardware, and manufacturing engineers that are bringing the best of modern UX and data science to an industry that has been overly rigid in its innovation. We are removing the barriers preventing radical advancement by providing tools to manufacturing engineers and operators to move information more freely, collaborate with their teams more easily, and use the power of data to predict problems and provide insights that result in better hardware quality and delivery. Compensation Range: $170K - $190K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About this Role Radiant is seeking a mission-obsessed and hands-on Senior People Business Partner to support an industry-leading People Operations function. This operator will help shape Radiant’s critical asset: our team. The ideal candidate thrives in high-growth, high-ambiguity environments and brings expertise across human resources and program operations to scale technical teams. You should be energized by tough challenges and committed to building the people practices and programs to develop a high-performing and highly engaged team. This is a rare opportunity to shape the future of nuclear energy and the team that will make it happen. Responsibilities & Duties: Strategic HR Business Partnership Act as a trusted advisor and embedded partner to engineering leaders across all levels, helping them build, develop, and retain high-performing teams. Translate business objectives into people strategies in partnership with Talent Acquisition, including workforce planning, organizational design, and headcount forecasting and succession planning aligned to company milestones. Coach and develop managers and senior leaders on performance management, team dynamics, and leadership effectiveness. Equip them with frameworks and tools that make them better operators. Lead and facilitate talent reviews and calibration sessions. Ensure the right people are in the right roles at the right time. Build and maintain dashboards tracking key people metrics and present actionable insights to leadership on a regular cadence. Drive accountability for goals. Partner with leadership to set measurable team and individual performance expectations, and ensure consistent, rigorous performance review cycles are executed on time and with quality. Identify organizational risks and workforce gaps before they become problems. Proactively surface trends and recommend interventions. Employee Relations & Culture Serve as the primary point of contact for employee relations matters in your business unit(s). Conduct thorough, impartial investigations and drive timely, well-documented resolution. Build and protect a culture of high standards. Radiant's culture is not accidental; it is built deliberately and defended actively. Maintain strict confidentiality across all employee matters without exception. Change Management & Communications Partner with leadership to develop internal communications that are clear, direct, and consistent with Radiant's voice and values. At a company moving this fast, how we communicate change is as important as the change itself. Lead the people-side of organizational change. Develop and execute structured change management plans with clear owners, timelines, and success metrics. Anticipate how organizational decisions will land across different teams and functions. Identify potential points of friction early and build strategies to address them. Serve as a steady, credible voice during periods of ambiguity. Model the calm, high-trust communication culture Radiant expects from its leaders. Compliance & Operations Support operational readiness as Radiant scales: onboarding infrastructure, HRIS integrity, policy development, and cross-functional coordination with Finance and Operations. Ensure Radiant remains compliant with federal, state, and local employment law. Continuously improve systems, processes, and procedures, with an eye toward scalability, auditability, and a frictionless employee experience. Required Qualifications & Skills: Bachelor's degree in Business Administration, Human Resources, Psychology, Economics, or a related field. 8+ years of progressive HR business partner experience in fast-paced or startup environments. Prior experience supporting engineering, manufacturing, or production teams strongly preferred. Deep expertise in California labor law and compliance. Proven track record of partnering with technical leaders to drive measurable people outcomes. Strong analytical skills. Comfortable building reports, interpreting workforce data, and translating metrics into leadership recommendations. Excellent interpersonal, verbal, and written communication skills. Desired Qualifications & Skills: Multi-state labor compliance expertise across exempt and non-exempt workforces. Experience in hard tech, aerospace, defense, energy, or similar industries where precision and accountability are non-negotiable. Mission-obsessed. Able to articulate why this work matters and inspire others to perform at their best. Highly autonomous with strong judgment; knows when to escalate and when to execute. Demonstrated ability to build trust quickly at all levels of an organization. Track record of delivering consistent, high-quality outcomes under tight timelines with a focus on growth over comfort. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $115K - $168K

Job Description Hadrian - Manufacturing the Future Hadrian is building autonomous factories that help aerospace and defense companies manufacture rockets, satellites, jets, and ships up to 10x faster and up to 2x cheaper. By combining advanced software, robotics, and full-stack manufacturing, we are reinventing how America produces its most critical parts. We’re accelerating our mission with the launch of Factory 3 in Mesa, Arizona, a 290,000-square-foot facility creating 350 new jobs. We are expanding rapidly to support thousands of future hires, launching Hadrian Maritime to expand into naval production, and introducing a Factory-as-a-Service model that delivers complete systems instead of individual parts. Hadrian is backed by leading investors including T. Rowe Price, Lux Capital, Founders Fund, and Andreessen Horowitz, our fast-growing team is united around reindustrializing American manufacturing for the 21st century and beyond. The Role We are hiring an Automation Engineer, NDT to design and deploy automation for advanced NDT inspection cells across UT, VT, RT, and CT. This is an end-to-end automation role for someone who has direct experience building inspection capability in the real world. You will own robot / motion paths, sensor integration, acquisition timing, station sequencing, operator UX, data traceability, safety, and production commissioning. You will partner with certified NDT personnel and Quality on method validation, acceptance criteria, and audit evidence. This is not an NDT technician role and not a generic controls role. We are looking for someone who has personally designed, deployed, or commissioned automated inspection / NDT systems and knows what breaks when those systems hit production. What You'll Do Design and deploy automated inspection cells for advanced NDT methods including ultrasonic testing (UT), visual testing / visual inspection (VT), radiographic testing (RT), and computed tomography (CT). Own the cell automation stack: robot / motion path, sensor integration, deterministic triggering, acquisition PC, sequencer, HMI / operator UX, data logging, and production handoff. Plan scan / inspection paths that balance coverage, probability of detection, cycle time, kinematics, collision risk, and operator workflow. Integrate modality-specific hardware: phased-array UT probes, cameras / lighting / optics, digital radiography sources and detectors, CT turntables / reconstruction flows, and related acquisition systems. Partner with certified NDT personnel and Quality to validate methods against applicable standards and customer requirements. Build structured inspection data pipelines for SPC, traceability, customer handoff, and archival. Own station safety with EHS: radiation for RT / CT, laser / lighting for VT, couplant / water / ergonomics for UT, collision and LOTO for all modalities. Commission on the floor, debug drift / escapes / false calls / timing issues, and hold the line when inspection blocks production. Qualify vendors and integrators; write acceptance tests, red-line designs, and keep suppliers honest. Codify reusable inspection automation patterns so the next station inherits a platform instead of a one-off science project. What We're Looking For 3+ years designing, deploying, or commissioning automated inspection / NDT systems in production or high-reliability environments. Direct ownership of at least one automated inspection station involving robot / motion, sensor acquisition, station sequencing, data logging, and acceptance / production handoff. Deep practical experience in at least one advanced NDT modality: UT: phased-array, TFM / FMC, encoded scanning, robotic scan paths, couplant handling. VT: 2D / 3D / multispectral vision, lighting, optics, calibration, dimensional / cosmetic inspection, gauge R&R. RT: digital radiography, source / detector integration, shielding, interlocks, radiation safety. CT: turntable / positioning, reconstruction pipeline, volumetric analysis, large-data workflow. Measurement rigor: MSA / gauge R&R, POD / ROC where applicable, uncertainty, acceptance criteria, and audit-ready evidence. Working knowledge of robot / motion systems and industrial controls such as Fanuc, ABB, Kuka, Yaskawa, Beckhoff TwinCAT, or Siemens TIA. Comfort debugging across mechanical, controls, acquisition, software, data, Quality, and operator workflows. Bachelor's degree in EE, ME, Mechatronics, Robotics, Physics, Materials, or related STEM, or equivalent direct experience. ITAR eligible. What Will Set You Apart Radiation safety officer / state radiation safety training for RT / CT. GD&T, CMM, metrology, or dimensional inspection background. Python or C# for acquisition glue, vendor SDK wrappers, data processing, or inspection automation tooling. Experience with inspecting to industry standards such as NAS 410, SNT-TC-1A, ASTM, AWS D1.x, MIL-STD, NAVSEA, or customer-specific aerospace / defense inspection requirements. Experience designing and deploying automation into production. Offline robot programming and simulation experience with RoboDK, Process Simulate, Visual Components, or native robot tools. Production experience in aerospace, defense, medical, power generation, nuclear, or shipbuilding environments where customers audit inspection methods. Experience turning one-off inspection stations into reusable platforms: calibration workflows, scan-path templates, fixture standards, data schemas, and acceptance tests. Compensation $145,000 - $230,000 (actual range may vary based on experience) This range reflects what we reasonably expect to pay at the time of posting. Compensation depends on education, experience, skills, location, performance, and business needs. Benefits for Full-time Employees Medical, dental, vision, and life insurance plans for employees 401k Relocation support may be provided for certain situations, based on business need. Flexible vacation policy ITAR Requirements To conform to U.S. Government space technology export regulations, including the International Traffic in Arms Regulations (ITAR) you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State. Learn more about the ITAR here. Hadrian Is An Equal Opportunity Employer It is the Company’s policy to provide equal employment opportunity for all applicants and employees. The Company does not unlawfully discriminate on the basis of race inclusive of traits historically associated with race (including, but not limited to, hair texture and protective hairstyles, such as braids, locks and twists), color, religion, sex (including pregnancy, childbirth, or related medical conditions), gender identity, gender expression, transgender status, national origin (including, in California, possession of a drivers license), ancestry, citizenship, age, physical or mental disability, height or weight, medical condition, family care status, military or veteran status, marital status, domestic partner status, sexual orientation, genetic information, exercise of reproductive rights, any other basis protected by local, state, or federal laws, or any combination of the above characteristics. When necessary, the Company also makes reasonable accommodations for disabled candidates and employees, including for candidates or employees who are disabled by pregnancy, childbirth, or related medical conditions.

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the role Radiant is seeking a Principal Embedded Software Engineer to set the technical direction for embedded software across instrumentation and control (I&C) systems. You will define architecture, establish engineering standards, and personally drive the development of mission-critical, highly performant embedded systems that interface with sensors and actuators at the heart of a first-of-its-kind reactor design. The ideal candidate thrives in ambiguous early-stage environments, can make high-consequence technical decisions with incomplete information, and leaves a lasting organizational imprint through the systems and culture they build. You will have the opportunity to shape the embedded software foundation of the first commercialized portable nuclear microreactor, technology that will redefine how the world accesses clean, reliable power. Responsibilities and Duties Define and own the embedded software architecture for I&C systems, establishing patterns and standards that scale across the full program lifecycle. Lead design and development of reliable, fault-tolerant embedded software for production hardware operating in demanding environments. Develop and bring up new drivers for I&C hardware across a range of sensing and actuation subsystems. Serve as the senior technical voice in design reviews, setting the bar for rigor, surfacing systemic risks, and driving decisions that span multiple subsystems and teams. Own the full engineering lifecycle, from architecture through test, build, and field implementation, and set expectations for how the team executes that lifecycle. Establish robust hardware and software testing frameworks, validation methodology, and documentation standards that meet rigorous safety requirements. Mentor and grow embedded engineers across the team; model technical excellence and engineering judgment. Partner with electrical, controls, and hardware engineering leadership to align on cross-disciplinary interfaces and constraints. Required Qualifications and Skills Bachelor's degree in computer engineering, computer science, electrical engineering, or a related field. 8+ years of industry experience in embedded software, including significant ownership of system-level architecture decisions. Demonstrated experience driving architecture across complex, multi-subsystem embedded programs, not just feature ownership. Hands-on experience with an RTOS (Zephyr, NuttX, ThreadX, etc.), including low-level bring-up and porting. Deep proficiency in embedded C/C++. Track record of influencing technical direction beyond your immediate team, through documentation, standards, or cross-functional alignment. Strong communicator capable of driving consensus across engineering, program, and leadership stakeholders. Desired Qualifications and Skills Experience with Zephyr RTOS at an architectural or maintainer level. Experience working with Simulink Autocode C++ export in a production context. Experience with CMake in large, multi-target embedded builds. Proficiency in reading and interpreting hardware schematics; ability to debug at the hardware/software boundary. Experience in safety-critical or high-reliability domains (aerospace, defense, medical, nuclear, or industrial). Additional Requirements Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $200,500 - $314,475

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking an Engineering Manager to lead the Electronics team. This team owns the electronics architecture for terrestrial reactor controls, with a long-term path toward space reactor applications. You will be the technical authority for custom hardware—low-noise analog front ends, high-speed data conversion, DSP, and PCB design—from requirements capture through field operation. Responsibilities & Duties: Build and manage a team of electrical engineers to develop and test the next generation of reactor control systems. Own the electronic architecture for terrestrial and, in the future, space reactors. Collaborate with other teams to define requirements for all electronic designs, environmental, noise, accuracy, input range, and reliability. Own acceptance and qual testing of all in-house PCB designs to verify design and build to requirements. Required Qualifications & Skills: Bachelor’s degree in electrical engineering, or a related field. 5+ years managing electrical engineers. 5+ years designing mixed signals, analog, or RF hardware. Proven track record of PCB design. With considerations for low noise, matched impedance signal routing, conduction cooling, robust internal and external connectors. Preferably in Altium. Strong experience with industrial signal types, 4-20mA, RTD, Thermocouples, and Resolvers. Experience with high-speed, sensitive signals. Experience with digital communication interfaces such as SPI, I2C, CAN, Ethernet, and RS422. Experience with EMI/EMC best practices for design and strategies to mitigate exceeding levels. Desired Qualifications & Skills: Master’s degree in electrical engineering, physics, aerospace, mechanical, nuclear engineering, or a related field. Experience with rad hardened circuit design. Experience with control system design for nuclear applications. Experience with nuclear instrumentation and signals. Experience with applying IEEE-603 in electrical designs. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $208,500 - $284,025

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Lead Test Engineer, Power Generation to own the strategy, execution, and team leadership for testing the power generation system including turbomachinery, heat exchangers, controls, and primary cooling systems. This role is ideal for a hands-on technical leader who enjoys building test infrastructure, running complex hardware, and mentoring engineers and technicians while remaining deeply involved in day-to-day testing. You will lead testing development for our high-speed machinery and own creating our test site from the ground up. This test infrastructure will be used to iterate quickly on our designs evaluating vibration, performance, thermal behavior, and system reliability in development and transition into acceptance testing for production units. This role works closely with mechanical design, analysis, manufacturing, and operations teams to ensure turbomachinery designs are validated, robust, and production-ready. Responsibilities & Duties: Test Site & Infrastructure Development Lead requirements definition, design, and implementation of Radiant’s test site. Design, build, commission, and maintain test rigs, fixtures, instrumentation, and support systems for turbomachinery, heat exchangers, controls, and primary cooling systems. Establish operating procedures, safety controls, and facility readiness for high-speed, high-energy, and high-temperature test environments. Test Strategy, Planning & Technical Ownership Own and lead the turbomachinery test strategy across development, qualification, and production acceptance phases. Define test objectives, plans, success criteria, instrumentation strategies, and data requirements for high-speed rotating machinery and supporting thermal-fluid systems. Serve as the technical authority for vibration, rotordynamic, and bearing-related testing. Translate analytical predictions (critical speeds, stability margins, transient response) into targeted test campaigns that validate design assumptions and retire risk. Balance test coverage, technical risk, schedule, and hardware availability to enable rapid iteration while maintaining safety and rigor. Test Execution & Data Analysis Plan and execute development, qualification, and acceptance tests including startup/shutdown, transient, off-design, and endurance testing. Operate test hardware hands-on with a strong emphasis on repeatability, data quality, and safety. Analyze test data to assess vibration behavior, rotordynamic stability, bearing performance, thermal response, and overall system performance. Compare test results against analytical predictions and work with design teams to resolve discrepancies. Collaborate with mechanical engineers to conduct root cause investigations, identify anomalies or failures, and implement corrective actions supported by test evidence. Technical Leadership & Team Development Provide technical leadership and mentorship to test engineers and technicians. Act as a player-coach: remain hands-on while scaling testing capability, throughput, and organizational maturity. Support hiring, onboarding, and technical development of turbomachinery test personnel. Develop work estimates, test schedules, and status updates for program leadership. Review and approve test procedures, reports, and data packages. Establish standards for test documentation, data management, and knowledge capture. Help mature Radiant’s turbomachinery test processes, labs, and safety culture over time. Cross-Functional Collaboration Partner closely with turbomachinery mechanical engineers to ensure designs are testable and adequately validated. Review component and system-level design documentation with an eye toward test coverage, instrumentation, and risk. Collaborate with thermal, manufacturing, quality, and operations teams to support prototype, first-article, and production hardware testing. Represent testing in design reviews, test readiness reviews, and technical leadership discussions. Required Qualifications & Skills: Bachelor’s or Master’s degree in Mechanical Engineering or a related field, or equivalent experience. 8+ years of experience in testing, development, or validation of turbomachinery, rotating equipment, or complex mechanical systems. Hands-on experience testing high-speed rotating machinery and high-temperature hardware. Experience correlating test results with analytical predictions and design intent. Demonstrated technical leadership and ability to drive complex test efforts to completion. Strong written, verbal, and organizational skills. Desired Qualifications & Skills: Prior experience leading or mentoring test engineers or technicians. Experience with power generation or other high-reliability power generation systems. Strong understanding of rotordynamics, vibration, and bearing behavior as applied to real hardware testing. Familiarity with rotordynamic analysis tools (e.g., XLrotor, Dyrobes, or equivalent) from a test correlation or validation perspective. Familiarity with relevant industry standards (API, ASME, ISO). Startup or fast-paced hardware development experience. Prior nuclear experience is not required. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $158,000 - $247,275

Job Description Senior Motor Design Engineer Radiant is seeking a talented Senior Motor Design Engineer to design and develop an alternator for the nuclear-driven, high-speed power generator. Responsibilities include but are not limited to the design of active parts, and the structural and thermal analysis of high-speed generators.You will collaborate with engineers cross-functionally and partner closely with the Power Conversion and Electrical Systems team responsible for converting mechanical energy to electrical to be delivered to customers safely and reliably. The successful candidate will own active part design of generators, along with performing analysis, simulation, and component selection. You'll make a big impact in commercializing Earth's first mass-produced nuclear reactors and power remote areas and critical infrastructure with abundant clean energy. Responsibilities and Duties: Own design, development, and integration of high power alternator and primary loop motor for a nuclear power generator Apply electromagnetic design and testing for a closed-loop Brayton cycle and its electric motor/generator components Create 3D models and 2D fabrication drawings in CAD and NX Own communications with vendors to source all components to build the generator Perform bench testing, dynamic testing, and system testing for all subsystem components and models Perform hands-on assembly, rapid prototyping, and integration of high voltage electric motors and generators Required Skills and Qualifications: B.S. in Electrical Engineering, or mechanical engineering specializing in power electronics 5+ years of design experience designing high-voltage and high-power electric motors and/or generators Fundamental knowledge of electric motors Expert in design of different types of permanent magnet motors in +1kV, +1MW applications with speeds +40krpm Desired Skills and Qualifications: 8+ years of generator design M.S in Electrical Engineering, or Mechanical Engineering specializing in power electronics Knowledge of motor control systems including SVM Deep understanding of Power Electronics and interaction of electronics circuits with electromagnetics components Define and optimize generator requirements and update design to comply with system level limitations and specifications Great team player with one team mentality working with turbomachinery, power electronics, thermal, packaging and software teams Additional Requirements Must be willing to work extended hours and weekends as necessary to accomplish our mission Must work 100% onsite at El Segundo HQ Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $158,000 - $247,275

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role The Senior Power Electronics Engineer will play a pivotal role in the design and development of the power electronics of our nuclear-driven high-speed generator. Responsibilities include but are not limited to the design of high-voltage and high-speed generator drives, DC-DC converters for high-voltage batteries, and standalone and grid-tied inverters. You'll join the Power Conversion and Electrical Systems team responsible for converting mechanical energy generated from a nuclear reactor to electrical energy to deliver to customers. You will own power electronics design, analysis, simulation, and component selection. You will partner cross-functionally with top industry engineers at Radiant, as well as vendors and partner organizations, including government agencies. Your efforts will be instrumental in bringing the first nuclear microreactor to market. Responsibilities & Duties: Design power electronic systems to convert AC and DC power sources into stable grid compatible voltages and frequencies. Take ownership and configure our systems active rectifiers, inverters, dc/dc converters. Apply EMI/EMC strategies to the system design, selection of line filters, capacitors, grounding and isolation. Utilize expertise in design and validation of gate drivers, power stages, magnetics, and controls. Conduct modeling and detailed simulation of inverters. Own the design and build a fully functioning inverter autonomously. Perform circuit formal analysis, e.g., de-rating and worst-case circuit analysis. Optimize loss, efficiency, and conduct thermal analysis of the inverter. Required Qualifications & Skills: Bachelor's degree in Electrical Engineering, specializing in power electronics. 6+ years of design experience designing high voltage and high-power electronics. Expert with high voltage power semiconductor selection (Si/SiC/GaN, IGBT, Diodes, MOSFETs), gate driver, and protection circuit design. Strong experience in high voltage (HV) power electronics design (+800V) including AC/DC inverters, and DC/DC converters. Strong understanding of different PWM switching techniques, DPWM, ZCS, ZVS. Proficiency with at least one of the common power electronics tools such as PLECS, PSCAD, dSPICE, PSIM, or Simplorer. Expertise in EMI/EMC filter design for stability, noise rejection, and surviving threat signals. Solid understanding of capacitor and super-capacitor design and selection, such as electrolytic, film, ceramic, and tantalum. Desired Qualifications & Skills: 8+ years of design experience designing high voltage and high-power electronics. Experience in magnetics design including transformers and inductors for high-frequency power conversion applications. Familiarity with functional safety standards (IEC 61508 or equivalent) and fault-tolerant design practices; background in aerospace, defense, or nuclear applications a plus. Startup experience or ability to work in a fast-paced development environment. Demonstrated experience in embedded programming with C/C++. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $158,000 - $219,450

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. Director of Regulatory Affairs Radiant is seeking a highly engaging and effective leader for our regulatory and licensing team. The Director of Regulatory Affairs will oversee licensing engagement, strategy, process, and execution with the U.S. Nuclear Regulatory Commission (NRC). You will play a pivotal role in driving Kaleidos’ development timeline, successful demonstration, and future commercialization. The ideal candidate is experienced working with government agencies and officials in risk-informed regulations, is determined to execute on how things should be done vs. how they’ve always been done and can engage deeply with our engineering organization to produce a foundationally safe product rather than one that simply checks regulatory boxes. The ideal candidate will foster a healthy team culture, provide support and clarity where needed, and come in with a player-coach mindset. We are looking for someone who is excited to put the first microreactor on the market and provide clean, reliable energy to remote areas around the world. This role reports to our Chief Nuclear Officer and is based in Washington, DC. Responsibilities and Duties: Provide licensing and regulatory leadership and strategic guidance to a high performing team. Craft a modern regulatory strategy based in sound engineering principles with input from executives, our board of directors, and industry experts that brings the safest product to market the fastest. Own end- to- end licensing execution efforts establishing strict principle-based standards while promoting streamlined, modern approaches to regulatory interactions. Facilitate collaborative and cohesive partnerships with internal stakeholders and external regulatory and governing bodies to drive desirable results. Includes attending in-person NRC visits, online meetings, and industry-related social events. Ensure the completeness, timeliness, and quality of licensing and regulatory submissions. Integrate our regulatory process with technical teams to meet quality assurance and regulatory standards. Required Skills and Qualifications: Bachelor’s degree at an accredited institution in engineering discipline. 8+ years of industry experience working on nuclear regulatory and licensing efforts. 2+ years leading a team. Ability to travel and attend in-person meetings. Desired Skills and Qualifications: Direct experience with the NRC. Experience in 10 CFR 50 and 10 CFR 70. Demonstrated ability work with a technical team to take complex information and simplify it for non-technical audiences. Intrinsic motivation to forge through decades of regulatory precedence with a creative approach. Strategic aptitude to bring together various complicated threads into a simple throughline. Outstanding written and verbal communications skills, as well as building relationships with internal and external stakeholders. Demonstrated ability to create coalitions and partnerships with other leaders in nuclear industry. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $186K - $258.3K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Reactor Operations Training Specialist to play a critical role in enabling safe, scalable operations for the line of Kaleidos reactors. In this role, you will be responsible for building Reactor Operator training resources to enable timely and effective training and certification of operators. This role goes beyond traditional documentation, requiring close, daily collaboration with operators, engineers, and test teams to rapidly translate emerging system knowledge into clear, actionable content. This role may also support engineering operations through the development of test plans, data reviews, and other key technical documentation needed to move from prototype to commercial deployment. Responsibilities & Duties: Develop and continuously refine Reactor Operator training materials, including operator manuals, learning objectives, lesson plans, operating procedures, and evaluation tools. Maintain records of operator qualification to DOE/NRC standards. Translate evolving reactor designs and operational concepts into clear, concise, and easily understood training content. Embed with engineering, test, and operations teams to capture real-time technical insights and lessons learned and reflect them in documentation. Establish and maintain documentation standards, templates, and style guides suited for a fast-paced startup environment. Manage document lifecycles within configuration-controlled systems, including version control, change tracking, and rapid updates. Balance speed and rigor to ensure documentation supports both rapid development and regulatory expectations. Capture operational lessons learned and support development of regulatory documents, to include white papers and topical reports. Required Qualifications & Skills: Bachelor’s degree in Engineering, Physics, Technical Communication, or a related technical discipline. 2+ years of technical writing experience in a complex, engineering-driven environment (e.g., nuclear, aerospace, energy, or advanced hardware). Familiarity with complex systems and the ability to distill them into operator-focused training content through both written and verbal mediums. Ability to deliver instructional material in both group and one-on-one classroom environments. Ability to read and interpret engineering drawings, specifications and procedures. Ability to work with incomplete or evolving technical information and produce clear, accurate documentation. Experience developing training materials, technical references, or test documentation. Strong collaboration skills and comfort working directly with engineers and operators in a dynamic setting. Familiarity with document control and configuration management principles. Desired Qualifications & Skills: Direct experience with nuclear systems, reactor operations, or operator training programs. Background in instructional design or building technical training programs Familiarity with NRC or DOE regulatory instructions and licensing considerations for commercial reactors. Ability to operate with a high degree of ownership and autonomy in an evolving organizational structure. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $139.5K - $172.2K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a driven Regulatory Systems Engineer who loves to think outside the box and challenge convention; in this role you will support the license application approval process with the Nuclear Regulatory Commission. This role is critical to bringing the world’s first portable nuclear microreactor to commercialization in a timely manner. You will be a go to subject matter expert for the regulatory process and collaborate across technical teams to inform design, build and test campaigns. You will lead interactions between regulators and the engineering team to obtain clarity and answers on regulation. You will integrate analysis and test results from the design teams with supporting justifications and own the deliverables that make up a full license application. This is an exciting opportunity for systems engineers who enjoy both technical work and operational execution. You will have direct ownership of modernize regulatory strategy to bring the safest microreactor to market in the shortest timeline. Responsibilities & Duties: Own end to end licensing execution efforts required to fulfill an application deliverable, ranging from detailed safety analysis to a physical protection plan. Facilitate collaborative and cohesive partnerships with internal stakeholders and external regulatory bodies (NRC) to drive desirable results using streamlined, modern regulatory approaches. Oversee execution by technical teams including design reviews and regulatory and quality documentation; organize their inputs into data products and reports; raise regulatory concerns and see through timely and successful resolution. Proactively review approaches and decisions as they relate to regulatory efforts to ensure adherence to Radiant’s novel and efficient licensing paths. Ensure completeness, timeliness, and quality of licensing and regulatory submissions. Write software scripts to automate and produce data analysis and documentation. Required Qualification & Skills: Bachelor’s degree in one of the following disciplines: nuclear engineering, mechanical engineering, electrical engineering, computer science, or similar technical field from an accredited institution. 2+ years of experience certifying, regulating, qualifying or auditing hardware that was manufactured, deployed, and iteratively improved. Excellent verbal and written communication and negotiation abilities; ability to navigate regulatory conversations effectively and write technical documentation. Applied understanding of requirement derivation, negotiation and verification or experience with the product design process especially as it relates to defining systems, interfaces and specifications. Desired Qualifications & Skills: 5+ years of experience working in a manufacturing environment with strict regulatory oversight. Experience working on a nuclear project with DOE or NRC regulation. Experience tailoring or implementing NQA-1, ISO9001, AS9100, or other industrial standards. Experience owning, designing, building, or testing hardware that has seen production. Ability to apply fundamental engineering principles to regulatory efforts. Strong ability to lead issues through resolution that may be ambiguous or uncertain in nature. Excellent project management skills and experience in driving schedules forward. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $133,500 - $190,050

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a driven Principal DevOps Engineer to own on-site High-Performance Compute (HPC) infrastructure, deployment, and automation projects in tight collaboration with hard-science users and cloud infrastructure engineers. You will work closely with the software team to design scalable, secure, and resilient DevOps practices, tools, and systems across the entire organization. As a technical lead, you will define team scope, shape individual responsibilities, and serve as the primary liaison between engineering and software teams, acting as the subject-matter expert on workflows, tools, and optimizations. The ideal candidate is patient, organized, and comfortable managing high volumes of cross-disciplinary requests, capable of diving deep into complex legacy stacks and synthesizing findings. The infrastructure you manage, the pipelines you build, and the developer productivity culture you establish will help design, run, and mass-produce the first high-temperature gas-cooled portable microreactor ever commercialized. Responsibilities & Duties Lead HPC initiatives as driven by the software org, establishing responsibilities, project scope, and technical mentorship. Serve as the go-between for engineering teams and software, fielding HPC questions, simulation software issues, and infrastructure needs from nuclear, thermal, materials, mechanical, and electrical engineers, translating them into actionable work. Own workflows, tooling, and performance for scientific computing, including Ansys, STAR-CCM+, and Abaqus, covering licensing, environment setup, job orchestration, and results infrastructure. Triage inbound infrastructure requests, HPC/MPI/Linux debugging, job failure analysis, shell and systems mentorship, while prioritizing effectively and communicating clearly across stakeholders. Partner with DevOps engineers to architect and maintain infrastructure across AWS and on-premises Linux environments, ensuring high availability, security, and performance for mission-critical systems. Dive deep into HPC software, workload scheduling, data movement, storage hierarchies, and compute environments to build robust, high-throughput Linux systems. Modernize legacy scientific computing systems and tooling, migrating to current stacks to improve maintainability, performance, and developer experience. Architect tools supporting build systems, testing frameworks, deployment automation, and developer environments. Design and maintain networking infrastructure for distributed simulation systems, optimizing data transfer between HPC clusters. Required Qualifications & Skills Bachelor's degree in Computer Science, Engineering, or a related technical field. 8+ years of professional experience in DevOps, Site Reliability, Infrastructure, or Platform Engineering. Expert-level proficiency in one or more languages: Python, Golang, Rust, C#, or C/C++. Strong code review skills, including the ability to read stack traces and chase down dense rabbit holes in high-compliance, legacy scientific software environments. Working experience with Kubernetes and Docker for orchestration and deployment. Deep Linux and sysadmin fluency, file systems, process management, and networking, with a hard-science approach to problem-solving. Exceptional communication skills, organized, and effective when fielding a high volume of questions and requests from engineering stakeholders. Ability to dive deep into complex, nested legacy stacks and then zoom out to synthesize findings clearly for a broader technical audience. Desired Qualifications & Skills Hands-on physical infrastructure experience: server hardware, rack configuration, data center ops, or high-throughput networking (InfiniBand, Slingshot, AWS EFA). Scientific computing experience with direct exposure to HPC environments, simulation workloads, or academic/research computing (SLURM, PBS, MPI, Lustre, EFS, AWS ParallelCluster, PCS, etc.). Cloud DevOps experience, production-grade work with Kubernetes, Ansible, Terraform, or AWS in a cloud-native or hybrid environment. Experience working cross-functionally with engineering teams across mechanical, electrical, materials, and nuclear disciplines. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $200,500 - $314,475

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a talented Senior Electrical Engineer to own designs from requirements capture through operation. The candidate will be directly responsible for components of the nuclear microreactor control and measurement systems. The ideal candidate should be comfortable jumping from designing circuit boards to integration work interfacing with fault-tolerant, off-the-shelf hardware. This role requires collaboration with multi-disciplinary teams designing the nuclear reactor core, fluid heat transfer systems, and structures. Responsibilities & Duties: Collaborate with multidisciplinary teams to support the architecture, design, implementation, and testing of the microreactor electrical control systems. Design and develop industrial electrical control hardware including schematics, wiring diagrams, harnessing, and integration assemblies. Lead design of fault-tolerant and safety-critical electrical systems, emphasizing reliability, maintainability, and regulatory compliance. Develop and review electrical interface designs between control systems, power equipment, and instrumentation. Ensure designs comply with applicable electrical codes and safety standards including NFPA and NEC requirements. Perform SCCR and Arc Flash calculations. Required Qualifications & Skills: Bachelor’s degree in electrical engineering or related field. 5+ years of experience designing electrical hardware. Experience designing fault-tolerant and safety critical hardware. Experience with Ethernet, EtherCAT, Modbus, CANbus, RS-422, or other communications protocols. Experience selecting, integrating, and troubleshooting sensors including pressure transducers, RTDs, thermocouples, shaft speed and position sensors, IEPE vibration sensors, and MEMS-based sensors. Experience using electrical design software such as AutoCAD Electrical, Zuken, or similar schematic and wiring design tools. Experience designing, analyzing, and working safely with industrial power systems including 120 VAC, 208 VAC, and 480 VAC equipment, including applicable electrical safety practices. Strong electrical engineering fundamentals. Experience specifying and integrating Variable Frequency Drives (VFDs), soft starters, and motor control centers (MCCs). Desired Qualifications & Skills: Experience in electrical architecture make vs. buy trades. Experience with Siemens NX. Experience with PLCs, Twincat, structured text programming. Familiarity with EMI/EMC mitigation techniques and testing. Experience with Python, C/C++, or scripting languages for test automation, data acquisition, or diagnostics. Experience supporting nuclear instrumentation systems. Experience with FMEAs and hazard analysis. Experience with industrial network architecture and deterministic control networks. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $158,000 - $219,450

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Loads & Dynamics Engineer to own and execute structural loads, vibration, and dynamic analyses for complex mechanical systems associated for Kaleidos, the world's first portable microreactor and supporting hardware. You will play a critical role in ensuring structural integrity and survivability across all phases of the product lifecycle, including manufacturing, transportation, handling, deployment, and operational environments. This role requires a hands-on engineer who is comfortable working in ambiguous, fast-paced environments and collaborating closely with structures, mechanical design, thermal, nuclear, and test teams. Responsibilities & Duties: Develop and own static, dynamic, and transient loads for reactor systems, support structures, and transport configurations. Perform structural dynamics analyses, including modal, random vibration, shock, sine vibration, and fatigue assessments. Implement explicit dynamics simulations to model nonlinear reactor response under transient seismic and transportation event cases. Define and analyze transportation and handling environments, including shock and vibration from road, rail, air, or sea transport. Generate load cases and environments to support structural sizing, design margins, and verification plans. Conduct finite element analyses (FEA) using tools such as ANSYS, Abaqus, or similar tools. Collaborate with design engineers to influence hardware architecture, material selection, and joint design. Support test planning and correlation, including shaker tests, modal surveys, and structural verification testing. Develop and maintain analysis documentation, reports, and requirements for internal reviews and regulatory interfaces. Contribute to failure investigations, root cause analyses, and design improvements Help establish best practices for loads, dynamics, and structural verification within a growing engineering organization. Required Qualifications & Skills: Bachelor’s degree in Mechanical Engineering, Aerospace Engineering, Structural Engineering, or a related field. 3+ years of experience in loads, dynamics, or structural analysis for complex mechanical systems. Strong fundamentals in structural mechanics, dynamics, and vibration. Experience with finite element modeling and analysis of metallic and composite structures. Proficiency with industry-standard FEA tools (e.g., ANSYS, Abaqus, Nastran). Familiarity with design allowables, safety factors, and margin-of-safety methodologies. Ability to work cross-functionally and communicate analysis results clearly to both technical and non-technical stakeholders. Desired Qualifications & Skills: Experience in aerospace, launch, defense, nuclear, or heavy industrial hardware environments. Dynamics modeling software experience (LD-Dyna, Abaqus explicit, or other). Background in shock and vibration testing and test-article correlation. Knowledge of fatigue, fracture mechanics, and bolted joint analysis. Experience defining or interpreting environmental specifications and requirements. Master’s degree or PhD in a relevant engineering discipline. Familiarity with nuclear, spaceflight, or safety-critical system requirements. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $133.5K - $184.8K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking an Electrical Motor Design Engineer to own the architecture, technical direction, and execution of high-speed alternators and primary loop motors for our nuclear-driven power generation systems. This role leads the electric machine design function responsible for our 1MW high-speed rotating machinery central to commercializing Earth’s first mass-produced nuclear reactors. You will set the technical vision for motor design while guiding structural, thermal, and system integration efforts. As a player-coach, you will both contribute directly to design work and mentor a team of engineers to deliver safe, reliable, and production-ready generator systems. This is a hands-on technical leadership role with significant cross-functional influence. Responsibilities & Duties: Technical Ownership & Architecture Own system-level architecture and technical roadmap for 1MW, 30krpm alternators and primary loop motors. Lead electromagnetic design of permanent magnet machines for closed-loop Brayton cycle power systems. Define and flow down generator requirements from system-level constraints. Establish best practices for modeling, simulation, validation, and documentation. Make key technical decisions on topology selection, magnetics, insulation systems, cooling strategies, and manufacturability. Ensure designs meet performance, reliability, safety, and regulatory requirements. Team Leadership Lead and mentor a team of motor design engineers. Conduct design reviews and provide guidance on electromagnetic, structural, and thermal analysis. Drive technical prioritization, risk management, and execution planning. Build engineering rigor, documentation standards, and repeatable development processes. Cross-Functional Integration Partner closely with turbomachinery, power electronics, thermal, packaging, and software teams. Optimize electromechanical interfaces between generator, inverter, and control systems. Collaborate with manufacturing to transition from prototype to scalable production. Own technical engagement with external vendors and suppliers. Prototyping, Testing & Validation Oversee development and qualification testing of electric machines. Guide bench, dynamic, and system-level testing campaigns. Lead root cause analysis and rapid design iteration cycles. Maintain hands-on involvement in assembly, integration, and troubleshooting as needed. Required Qualifications & Skills: B.S. in Electrical Engineering or Mechanical Engineering with specialization in electric machines or rotating machinery. 5+ years of experience designing high-voltage, high-power electric motors and/or generators. Demonstrated expertise in permanent magnet motor design for +1kV, +1MW applications operating at up to 40,000 rpm. Strong proficiency with electromagnetic analysis tools (Ansys Motor-CAD, Maxwell, or equivalent). Experience with structural and thermal analysis of high-speed rotating machinery. Deep understanding of motor–inverter interactions and power electronics integration. Experience leading complex electromechanical development efforts. Hands-on experience with assembly, integration, and testing of electric machines. Desired Qualifications & Skills: 10+ years of generator design experience. M.S. or Ph.D. in Electrical or Mechanical Engineering. Knowledge of motor control systems including SVM. Experience scaling hardware from prototype to production. Prior experience leading small, high-performance engineering teams. Experience defining engineering standards and technical processes. Leadership Competencies Strong system-level thinking and architectural judgment. Ability to balance technical depth with execution speed. Clear communicator capable of aligning cross-functional teams. High ownership mindset and mission-driven motivation. “One team” mentality across engineering disciplines. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $171,000 - $284,025

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Principal Turbomachinery Engineer to serve as the Responsible Engineer for the turbomachinery within our nuclear-driven power generation system. This role owns the mechanical design, integrity, and performance of the core rotating assembly at the heart of our 1MW closed-loop Brayton cycle. You will define and drive the mechanical architecture of high-speed rotating hardware operating at extreme temperatures, pressures, and rotational speeds. As a deeply technical individual contributor, you will set direction for rotor dynamics, structures, bearings, seals, and system integration while working closely with electrical, thermal, and manufacturing teams. This is a hands-on, high-ownership role focused on technical excellence, sound engineering judgment, and delivering reliable, production-ready turbomachinery. Responsibilities & Duties: Technical Ownership & System Architecture Serve as Responsible Engineer for the turbomachinery mechanical system. Own the mechanical architecture and design strategy for high-speed rotating assemblies (up to ~30 krpm). Lead rotor dynamics, structural integrity, and life analysis for rotating components and assemblies. Define and flow down requirements from system-level constraints including thermal, structural, and operational environments. Make key technical decisions on rotor layout, shafting, bearings, seals, materials, and clearances. Ensure designs meet performance, reliability, safety, and regulatory requirements. Establish and uphold standards for mechanical design rigor, analysis quality, and documentation. Mechanical Design & Analysis Lead detailed design of turbomachinery components including rotors, shafts, housings, and support structures. Test and validate rotordynamic systems, driving model correlation, risk reduction, and performance verification. Perform and review structural and thermal analysis to ensure integrity under high-speed and high-temperature operation. Define tolerances, fits, stack-ups, and alignment strategies for precision rotating assemblies. Partner with electrical engineering on alternator rotor integration, including electromagnetic and structural coupling. Cross-Functional Integration Partner closely with turbomachinery aero, motor design, thermal, manufacturing, and test teams. Ensure seamless integration between turbine, compressor, and alternator subsystems. Drive clear interface definitions across mechanical, electrical, and thermal boundaries. Collaborate with manufacturing to ensure designs are producible, inspectable, and scalable. Engage with suppliers on technically critical components and design decisions. Prototyping, Testing & Validation Support assembly, integration, and test of turbomachinery hardware. Define validation strategies including spin testing, thermal testing, and system-level operation. Lead root cause analysis and drive design iteration for test failures or performance gaps. Remain hands-on in hardware bring-up, troubleshooting, and refinement. Technical Influence Act as a subject matter expert in turbomachinery mechanical design and rotating systems. Provide technical guidance and design reviews across the team without direct people management responsibility. Influence engineering direction through deep expertise, data-driven decisions, and strong judgment. Contribute to technical roadmap, risk identification, and mitigation strategies. Required Qualifications & Skills: B.S. in Mechanical Engineering or related field. 8+ years of experience designing high-speed rotating machinery (turbines, compressors, or similar systems). Deep expertise in structural analysis and mechanical design of turbomachinery. Experience with bearings, seals, and high-speed shafting design. Expert-level proficiency with analysis tools (e.g., ANSYS) and advanced use of NX and Teamcenter for complex design, simulation, and product lifecycle management. Strong understanding of tolerancing, GD&T, and precision mechanical assembly. Experience owning hardware through design, build, and test cycles. Hands-on experience with assembly, integration, and troubleshooting of turbomachinery. Strong system-level thinking and mechanical intuition. Excellent engineering judgment and decision-making capability. Ability to influence without authority across cross-functional teams. Clear communicator capable of articulating complex technical concepts. High ownership mindset and accountability for hardware outcomes. Ability to operate effectively in a fast-paced, first-of-a-kind development environment. Desired Qualifications & Skills: 10+ years of turbomachinery or rotating equipment experience. M.S. or Ph.D. in Mechanical Engineering. Experience with closed-loop Brayton cycle systems or similar energy systems. Familiarity with high-temperature materials and extreme environment design. Experience integrating mechanical systems with high-speed electric machines. Prior experience as a Responsible Engineer for complex hardware. Experience scaling hardware from prototype to production. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $200,500 - $314,475

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role We're building a new team to own Radiant's internal data infrastructure, executive analytics, and AI capabilities. As a Senior Data Platform Engineer, you'll be hands-on building the integrations and pipelines that connect Radiant's operational systems, Finance, HR, Supply Chain, Manufacturing, and Recruiting, into a unified data platform. Your first priority will be the ION-Ramp integration: building the pipeline that enables three-way matching (PO + Receipt + Invoice) between our manufacturing execution system and payments platform. This directly reduces manual work for the Finance team. From there, you'll expand to connect 9 enterprise systems, build dbt transformation models, and ensure data quality across the platform. Responsibilities & Duties: Build integrations: Configure Fivetran connectors, build custom pipelines, and connect 9 enterprise systems (ION, Ramp, QuickBooks, Rippling, Ashby, Salesforce, SharePoint, Smartsheet, DocuSign) Develop the ION-Ramp pipeline: Build the Snowflake → Databricks → Ramp pipeline that enables three-way matching for Finance Write dbt models: Transform raw data into clean, documented, tested models for dashboards and analytics Ensure data quality: Implement testing, monitoring, and alerting for data pipelines; catch issues before they reach dashboards Support dashboards: Work with stakeholders to ensure the data models support Finance, Operations, and HR/Recruiting dashboards. Document everything: Maintain clear documentation for pipelines, models, and data definitions Required Qualifications & Skills: Bachelor's degree in computer science, physics, or a similar field. 4+ years of data engineering or software engineering experience. Strong experience in Python, C++/C, Java or a similar language. Experience with data warehouses, Databricks, Snowflake, BigQuery, or Redshift ETL/ELT pipeline development, Fivetran, Airbyte, Stitch, or custom pipeline experience API integration experience, REST, GraphQL; you're comfortable reading API docs and building integrations with enterprise SaaS tools Data modeling skills, dimensional modeling, schema design, understanding of how data will be used downstream Desired Qualifications & Skills: 6+ years of data engineering or software engineering experience Background in hardware or hardtech companies—you understand manufacturing, supply chain, and physical product development Experience with dbt (data build tool) Experience with data quality frameworks and testing (Great Expectations, dbt tests, etc.) Comfortable building lightweight internal tools—Python/Flask, basic frontend—or using AI coding assistants (Cursor, Copilot) to extend your capabilities Familiarity with MES, ERP, or supply chain systems (ION, SAP, NetSuite, etc.) Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $158,000 - $219,450

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a proactive and strategic Indirect Procurement Manager to lead the sourcing, negotiation, and management of all goods and services for the indirect categories. This role is crucial in building and maintaining a resilient, cost-effective, and reliable supply base. You will be responsible for a wide range of categories, including Facilities, IT, Professional Services, MRO (Maintenance, Repair, and Operations), consumables, and complex R&D collaborations. You will work closely with Engineering, Operations, Finance, and Production members to ensure our partners and suppliers meet Radiant’s stringent technical, quality, and commercial requirements. The ideal candidate thrives in a fast-paced environment, possesses expert negotiation skills, and understands the complexities of sourcing specialized services within regulated industries. Responsibilities & Duties: Strategic Sourcing & Category Management: Develop and execute sourcing strategies for key indirect categories. This includes IT (hardware, software, SaaS), Professional Services (consulting, legal, engineering), MRO (Maintenance, Repair, and Operations), consumables, and R&D collaborations. Identify, evaluate, and select suppliers based on total cost of ownership, quality, reliability, and strategic fit. Complex Negotiations: Lead high-stakes commercial negotiations for a variety of agreements, including Master Service Agreements (MSAs), Statements of Work (SOWs), and licensing agreements. Additional focus includes negotiating favorable commercial and intellectual property terms with specialized external service providers, including national laboratories (e.g., Idaho National Laboratory), university research labs, and other advanced technical services. Facilities & MRO Procurement: Take full ownership of procurement for all facility-related needs. This includes sourcing and managing contracts for building maintenance, repairs, capital equipment, security services, janitorial, waste management, utilities, and supporting small-scale construction and lab build-out projects. Contract Management: Develop, review, and manage the full lifecycle of supplier agreements, including Master Supply Agreements (MSAs), Non-Disclosure Agreements (NDAs), and Purchase Order terms and conditions, ensuring compliance and mitigating risk. Purchase Order Management: Oversee the complete procure-to-pay lifecycle, from requisition review and PO placement to tracking and closure, ensuring timely delivery of goods and services. Supplier Relationship Management (SRM): Build and maintain strong commercial relationships with key indirect suppliers, acting as the primary point of contact for contractual and commercial matters and conducting regular business reviews to drive performance. Cost Analysis & Optimization: Analyze market trends and total cost of ownership to identify and execute on cost-saving opportunities across all indirect spend categories. Risk Management: Assess and mitigate supply chain risks related to indirect procurement, including supplier financial health, service level failures, and data security. Cross-functional Collaboration: Work seamlessly with internal stakeholders across all departments to understand their requirements, resolve supply issues, and support company-wide program timelines. Process Improvement: Contribute to the development and refinement of procurement policies, procedures, and systems to enhance efficiency, compliance, and control. Key Deliverables: Successfully negotiated contracts and favorable terms with critical service providers, labs, and facilities vendors. Demonstrated total cost of ownership (TCO) savings and cost avoidance through effective negotiation and strategic sourcing. A managed portfolio of purchase orders ensuring on-time delivery and service level agreement adherence. Comprehensive supplier performance reports focusing on commercial, delivery, and quality metrics for executives and senior management. Effective mitigation plans for identified supply chain risks. Streamlined and compliant procurement processes that support Radiant's Quality Assurance Plan and growing strategic needs. Required Qualifications & Skills: Bachelor’s degree in Supply Chain Management, Business Administration, Engineering, or a related field. 3–8 years of relevant experience in indirect procurement, strategic sourcing, or supply chain management, preferably within technology, energy, or industrial sectors. Proven track record of successful negotiation and management of complex service agreements and contracts. Strong understanding of indirect procurement processes (e.g., RFQ/RFP, category management, procure-to-pay). Excellent analytical, organizational, and problem-solving skills. Strong interpersonal and communication skills (written and verbal). Proficiency with ERP/MRP systems and standard office software. Ability and willingness to travel occasionally to supplier locations (up to 20%). Desired Qualifications & Skills: Experience sourcing for Facilities, MRO, IT, and Professional Services categories. Experience negotiating contracts with government entities, national laboratories, or universities. Familiarity with quality management systems (e.g., ISO 9001, AS9100) and their implications for procurement. Understanding of supply chain dynamics within the energy or nuclear sector. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $85.5K - $168K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a highly motivated Mechanical Engineer, Fluids Systems to own critical Kaleidos fluid systems from preliminary design through build and production. These systems include the primary loop subsystems and power conversion loop, serving to convert heat from the reactor core into electrical power. You will be responsible for the following: trade studies, component selection, thermal hydraulic analysis, piping design, vendor selection, assembly, and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026. Responsibilities & Duties: Own end-to-end engineering of fluid systems and components, including compressors, valves, and heat exchangers. Perform complex thermal and fluids analysis to drive design decisions, verify system performance, and ensure structural integrity using first-principle hand calculations and finite element tools. Perform trade studies to optimize system and meet program requirements. Develop and execute manufacturing/assembly instructions and test plans. Create and manage a Bill-Of-Materials (BOM). Find and develop suppliers for all components. Own subassembly design, manufacturing, and test schedules. Own risk analysis (FMEA) for subsystems. Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication. Required Qualifications & Skills: Bachelor’s degree from an accredited institution in Mechanical, Materials, Aeronautical, Civil or Structural Engineering. Experience with fluid system architecture design. 2+ years of experience in designing, building, and testing fluids systems. Proficient knowledge in fluid dynamics and thermodynamics. Proficient knowledge of heat exchanger design and analysis methods. Desired Qualifications & Skills: Knowledge of thermodynamic power cycles. Prior experience with designing piping system for thermal growth using hand calculations and FEA tools. Experience with process piping design and testing codes, such as ASME B31.3 and ASME PCC-2. Prior experience with fluid system modeling via Matlab/Python. Experienced in design for manufacturability and ramping up hardware build in a production environment. Experienced in designing and operating test stands. Takes extreme ownership of work and a high degree of responsibility. Excellent communication across multidisciplinary teams. Prior nuclear experience in not required for this role. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $107.5K - $150K

Job Description Nuclear Medicine Technologist Location: Anaheim, CA Position Type: Full-Time (On-Site) Salary: $ 110,826 to $ 140,389 (DOE) Responsibilities: • Prepare and administer radiopharmaceuticals, • Perform nuclear medicine imaging procedures, • Follow radiation safety protocols and quality standards, • Maintain accurate patient records and documentation, • Collaborate with physicians and healthcare teams, • Ensure patient comfort, safety, and high-quality care Qualifications: • ARRT (N), CNMT, or equivalent Nuclear Medicine certification required, • Strong knowledge of radiation safety and radiopharmaceutical handling, • Experience performing nuclear medicine imaging procedures, • Excellent organizational, documentation, and communication skills, • Ability to work independently and within a team, • BLS certification required, • Cardiac imaging or mobile imaging experience preferred Benefits: 401(k) Medical Insurance Dental Insurance Vision Insurance Company DescriptionLanceSoft is rated as one of the largest staffing firms in the US by SIA. Our mission is to establish global cross-culture human connections that further the careers of our employees and strengthen the businesses of our clients. We are driven to use the power of our global network to connect businesses with the right people, and people with the right businesses without bias. We provide Global Workforce Solutions with a human touch.LanceSoft is rated as one of the largest staffing firms in the US by SIA. Our mission is to establish global cross-culture human connections that further the careers of our employees and strengthen the businesses of our clients. We are driven to use the power of our global network to connect businesses with the right people, and people with the right businesses without bias. We provide Global Workforce Solutions with a human touch.

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role As a Project Developer in Radiant’s Commercial organization, your job is to deliver reactors to our contracted customers. You will own the end-to-end process, serving as the single point of accountability from contract award through reactor delivery. You will work with the customer’s site team, ensure compliance with contract requirements, and manage the project from local permitting through electrical interconnection. Within Radiant, your key points of contact will be the licensing, state engagement, engineering, and manufacturing teams. The projects you manage will be successful if they are delivered on time and on budget. Responsibilities & Duties: Ensure the successful delivery of projects under contract for deployment at government and commercial customer sites. Manage the timely execution of regulatory, engineering, and siting deliverables. Drive contract milestones to completion. Own deliverable creation and partner across the team where support is necessary. When working with our government customers, act as the primary interface with contracting officers, program offices, installation personnel, and end users. When working with our commercial customers, act as the primary interface with project sponsors, site leads, and operations personnel. Architect and maintain integrated master schedules and cost baselines, ensuring internal teams and subcontractors are aligned to contract obligations. Manage contract compliance including reporting requirements and milestone billing; support negotiation of contract modifications and change orders. Independently identify, assess, and drive resolution of programmatic risks and cross-functional dependencies. Stand up and refine the project management processes, tools, and reporting cadence needed to provide clear visibility to company leadership and consistent milestone updates to customer partners. Required Qualifications & Skills: 3-5+ years of experience in energy project development, project management, or a related field. Experience managing programs requiring the delivery of complex capital equipment or large scale industrial systems. Strong command of integrated master scheduling. Proven ability to manage programs with significant technical complexity, multiple parallel work streams, and cross-functional dependencies. Demonstrated experience managing and reporting project financial performance, budgets, scopes, and schedules. U.S. citizenship required (absolutely no exceptions); ability to obtain and maintain a security clearance. Desired Qualifications & Skills: Familiarity with electric power infrastructure projects and knowledge of business issues associated with power delivery services. Experience supporting U.S. government contracts. Direct working knowledge of FAR/DFARS compliance, government contract types (cost-plus, firm-fixed-price, time and materials), and federal reporting and audit requirements. Active DoD security clearance. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $115K - $168K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role We’re looking for a Structural Analyst, Turbomachinery to take ownership of the structural, thermal, and mechanical performance of high-speed rotating machinery, including compressors, turbines, and pumps in our power generation and primary cooling systems. You’ll work hand-in-hand with mechanical designers, build engineers, and test teams to ensure hardware performs as expected under extreme mechanical and thermal loads. You’ll contribute to trade studies, iterative design, prototype builds, simulations, and testing, making a tangible impact on Radiant’s mission. Responsibilities & Duties: Perform structural and thermal analyses of turbomachinery components and assemblies (i.e. compressors, turbines, rotors, electric motors, bearings, seals, and housings) to guide design decisions and ensure reliability under operational and transient conditions. Evaluate static and dynamic mechanical performance, thermal stresses, and coupled thermal-structural effects. Conduct fatigue, durability, and rotor-bearing performance analyses for high-speed rotating systems. Support analysis of airflow, heat transfer, and temperature distributions within turbomachinery components as part of thermal and structural evaluation. Troubleshoot and investigate complex interactions between mechanical, thermal, and rotor system behavior. Collaborate with mechanical design, build, and test teams to optimize component designs, assembly processes, and thermal management strategies. Support prototype and first-article testing, including test article integration, instrumentation setup, data collection, and analysis. Document technical results, communicate findings, and provide actionable guidance to cross-functional teams. Required Qualifications & Skills: B.S. in Mechanical, Aerospace, or Structural Engineering, or a related STEM field. 3–5 years of relevant experience performing structural, thermal, or turbomachinery analysis. Strong foundation in classical mechanics, stress analysis, and heat transfer principles. Hands-on experience with finite element analysis (ANSYS, Abaqus, or equivalent) for structural and thermal simulations. Familiarity with airflow, temperature distributions, and coupled thermal-structural evaluations within rotating machinery. Strong problem-solving, communication, and documentation skills. Desired Qualifications & Skills: M.S. in Mechanical, Aerospace, or Structural Engineering. Experience with rotor dynamics, critical speed assessment, and vibration/stability evaluations. Hands-on experience with high-temperature materials, thermal stress, and high-speed bearing design. Prior experience in energy, power generation, or regulated industries (nuclear, aerospace). Knowledge of industry standards (API, ASME, ISO). Prior hands-on experience with assembly, rotor stacking, or prototype hardware is a plus. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $124,500 - $172,725

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a highly motivated Senior Structures Engineer to design and develop critical structures within Kaleidos. You will solve unique challenges creating efficient and reliable structures that facilitate fission while surviving extreme temperature environments and meeting volumetric constraints. You will be responsible for the following: trade studies, material selection, detailed structural analysis, assembly, integration, and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026. Responsibilities & Duties: Ownership of critical structures such as mass-efficient transportable shielding systems, container system, and high temperature graphite and metallic systems. Conduct trade studies and develop designs to meet program requirements. Perform detailed thermomechanical analysis (static strength, durability/fatigue) and dynamic analysis (vibration, shock) to determine structural integrity (margins of safety) using both hand calculations and finite element tools. Develop and execute manufacturing/assembly instructions and test plans. Create and manage a Bill-Of-Materials (BOM). Find and develop suppliers for components. Own subassembly design, manufacturing, and test schedules. Own risk analysis (FMEA) for subsystems. Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication. Required Qualifications & Skills: Bachelor’s degree from an accredited institution in Mechanical, Aeronautical, Civil or Structural Engineering. 6+ years of experience designing structures. 4+ years of experience performing stress analysis using both hand calculations and finite element tools (Abaqus, Ansys, FEMAP, or similar). Desired Qualifications & Skills: Experience with design of multi-component assemblies in CAD (NX or similar). Experience designing hardware that was manufactured, deployed, and iteratively improved. Experience resolving thermal expansion issues in designs. Experience working with interdisciplinary teams. Solid understanding and application of GD&T. Proficiency with both “hand calc” analytical methods and higher fidelity finite element-based analysis methods. Ability to derive free-body diagrams for systems with which one was not previously familiar. Self-motivated with strong organizational, written, and oral communication skills. Experience with using text-based software development tools. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $133.5K - $184.8K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Hardware-in-the-Loop (HIL) Engineer to support the development and maintenance of Radiant’s NI PXI-based HIL system for Kaleidos. You will work closely with senior engineers to assist in hardware integration, testing, and validation of critical systems. This role is ideal for someone with foundational experience in HIL systems and a desire to grow their skills in real-time testing, automated validation, and electrical integration within a collaborative team environment. You will have the opportunity to contribute to the development of electrical integration systems that support the first successful fuel demonstration of a new commercial nuclear reactor design in over 50 years. Responsibilities and Duties: Assist in designing, building, and maintaining HIL test bench systems. Help configure test hardware, including power supplies, actuators, and sensor mapping. Support communication and integration with Digital Twin systems. Assist senior engineers with assembling and debugging HIL hardware and harnesses. Execute test procedures, collect data, and support analysis. Document test results, procedures, and lessons learned. Troubleshoot electrical and hardware issues with guidance from senior team members. Participate in design reviews and contribute ideas in a collaborative environment. Required Skills and Qualifications: BS in Electrical Engineering, Computer Engineering, or a related field. 2+ years of experience with HIL systems such as dSpace, NI PXI, Speedgoat, or similar platforms. Familiarity with NI HIL software (e.g., LabVIEW, TestStand) and programming/scripting in Python, C++, or C#. Hands-on experience with data acquisition, test execution, or electrical integration. Basic troubleshooting and debugging skills. Ability to work effectively in a team and communicate across disciplines. Desired Skills and Qualifications: Exposure to HW-SW integration and test procedures. Understanding of fundamental controls, software testing, and test processes. Interest in learning real-time simulation systems and FPGA-based systems. Familiarity with trace capture tools or data acquisition/analysis tools. Additional Requirements Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $124,500 - $172,725

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. Thermal Modeling Engineer (CFD) Radiant is seeking a driven Thermal Modeling Engineer with expertise in CFD and thermal FEA modeling. You will design, develop and implement simulations for the Kaleidos microreactor to ensure high fidelity, reliability, and safety of our systems. You’ll work on cutting edge technical problems for a high temperature gas reactor that inform decisions across reactor systems, cooling systems, shielding, and more. You will have an opportunity to work in an interdisciplinary environment and drive milestones forward to unlock commercialization of the first mass-produced nuclear reactor. Responsibilities and Duties: Develop and execute thermal analysis and CFD to evaluate design and performance of Kaleidos systems. Document analysis results to communicate clear and actionable outputs. Expand CFD capabilities, accuracy, and efficiencies via methods and workflow development projects. Own pipeline for producing analysis geometry from mechanical design CAD Develop methods and calculations to support and build confidence in lower-fidelity thermal analysis methods. Required Qualifications and Skills: Bachelor’s degree in engineering, physics, or similar field from an accredited institution. 3+ years experience with Star CCM+ or Ansys Fluent. Proficiency with CAD software (Siemens NX). Strong understanding of finite element and computational fluid dynamics modeling principles and methods. Experience communicating and distilling information with cross-functional teams. Desired Qualifications and Skills: Experience with radiation heat transport modeling. Knowledge of nuclear reactor design. Driven, self-motivated, and takes ownership of work end to end. Additional Requirements Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $107.5K - $150K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a highly motivated Senior Structural Engineer to design and develop critical structures within Kaleidos. You will solve unique challenges creating efficient and reliable structures that facilitate fission while surviving extreme temperature environments and meeting volumetric constraints. You will be responsible for the following: trade studies, material selection, detailed structural analysis, assembly, integration, and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026. Responsibilities & Duties: Ownership of critical structures such as mass-efficient transportable shielding systems, container system, and high temperature graphite and metallic systems. Conduct trade studies and develop designs to meet program requirements. Perform detailed thermomechanical analysis (static strength, durability/fatigue) and dynamic analysis (vibration, shock) to determine structural integrity (margins of safety) using both hand calculations and finite element tools. Develop and execute manufacturing/assembly instructions and test plans. Create and manage a Bill-Of-Materials (BOM). Find and develop suppliers for components. Own subassembly design, manufacturing, and test schedules. Own risk analysis (FMEA) for subsystems. Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication. Required Qualifications & Skills: Bachelor’s degree from an accredited institution in Mechanical, Aeronautical, Civil or Structural Engineering. 6+ years of experience designing structures. 4+ years of experience performing stress analysis using both hand calculations and finite element tools (Abaqus, Ansys, FEMAP, or similar). Desired Qualifications & Skills: Experience with design of multi-component assemblies in CAD (NX or similar). Experience designing hardware that was manufactured, deployed, and iteratively improved. Experience resolving thermal expansion issues in designs. Experience working with interdisciplinary teams. Solid understanding and application of GD&T. Proficiency with both “hand calc” analytical methods and higher fidelity finite element-based analysis methods. Ability to derive free-body diagrams for systems with which one was not previously familiar. Self-motivated with strong organizational, written, and oral communication skills. Experience with using text-based software development tools. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $133.5K - $184.8K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role We're building a new team to own Radiant's internal data infrastructure, executive analytics, and AI capabilities. As the Technical Lead, Enterprise Data (Director), you'll set the technical direction for the team—architecting the data platform, owning the AI strategy, and ensuring we make the right build-vs-buy decisions. This is a player-coach role. You'll lead technical direction and mentor engineers, but you'll also go hands-on when needed. You'll own the AI vendor evaluation process, which is critical given our ITAR/EAR security requirements—standard AI tools don't work out of the box, and we need someone who can navigate the landscape and find compliant solutions. Responsibilities & Duties: Set technical direction: Define the architecture for our data platform (Databricks, Fivetran, dbt) and AI tooling; make build-vs-buy decisions. Own AI strategy: Evaluate and select AI platforms (chatbot, enterprise search, specialized tools) that meet security requirements; lead RAG evaluation in H2. Lead technical delivery: Ensure the ION-Ramp integration, dashboards, and AI tools are built correctly; hands-on when needed. Mentor engineers: Set the technical bar for hiring; develop the DevOps and Data Platform Engineers on the team. Interface with SWE: Coordinate with the Software Engineering team on shared Databricks infrastructure; ensure operational and engineering workloads coexist. Navigate security: Work with IT/Security to ensure all technical decisions meet ITAR/EAR compliance requirements. Required Qualifications & Skills: 10+ years of software or data engineering experience, including hands-on AI/ML work. Deep understanding of the AI landscape—you can evaluate vendor tools, understand RAG architectures, and advise on build-vs-buy tradeoffs. Data platform architecture experience—you've designed and built systems on Databricks, Snowflake, or similar. Strong technical leadership—you can set direction, mentor engineers, and interface effectively with non-technical stakeholders. Hands-on ability—you're a player-coach who can write code when needed, not just draw diagrams. Desired Qualifications & Skills: Background in hardware, aerospace, or defense—you understand manufacturing data, supply chain systems, and the complexity of physical product development. Experience shipping AI products or building AI capabilities at a company (not just research). Experience with data integration tools (Fivetran, Airbyte, dbt). Experience in regulated environments (SOC 2, FedRAMP, ITAR). Familiarity with BI/analytics tools (Looker, Tableau, Power BI, Databricks dashboards). Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. This position requires the ability to work in the United States and eligibility for access to export-controlled information under ITAR/EAR. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $171,000 - $284,025

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking an experienced Engineering Manager who loves to think outside the box and challenge convention; in this role you will lead the authorization process for reactor deployment with our military partners. You will be responsible for regulatory submissions and timelines, collaborating across technical teams to create and deliver a formal application. You will lead interactions between regulators and the engineering team to obtain clarity and answers on regulation as well as manage and provide mentorship to junior members of the team. This is an opportunity to bring advanced nuclear technologies to market while also influencing the federal government and modernizing regulation. Responsibilities & Duties : Manage the customer relationship, coordinating interactions and meetings, tracking deliverables, submission and acceptance, and compliance to contracts. Own end to end licensing execution efforts required to fulfill an application deliverable, ranging from detailed safety analysis to a physical protection plan. Partner closely with internal stakeholders and external regulatory bodies to drive efficient project execution and authorization. Oversee execution by technical teams including design reviews and regulatory and quality documentation; organize their inputs into data products and reports; raise regulatory concerns and see through timely and successful resolution. Proactively review approaches and decisions as they relate to regulatory efforts to ensure adherence to Radiant’s novel and efficient licensing paths. Required Qualifications & Skills: Comfortable working in uncertainty on first-of-a-kind projects. Bachelor’s degree in engineering (nuclear, mechanical, electrical, computer science, or similar) from an accredited institution. 5 years experience in a regulated industry, preferably nuclear programs regulated by the NRC or DOE. Experience directly interfacing, interpreting and implementing regulatory requirements, with a focus on streamlining and right-sizing. Excellent verbal and written communication and negotiation abilities; ability to navigate regulatory conversations effectively and write technical documentation. Desired Qualifications & Skills: Thorough understanding of the engineering design process in a fast paced or agile hardware development environment. Experience in emergency preparedness, fire protection, safety analysis, radiation protection or other related regulatory subjects. Strong engineering fundamentals with an ability to understand and translate applicable portions of system design into a license application. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $160,500 - $236,250

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Senior Electrical Engineer with a strong focus on PCB design to lead the electrical architecture for terrestrial reactor control systems, with a long-term path toward space reactor applications. You will serve as the technical authority for custom hardware, owning the design and development of high-reliability, low-noise printed circuit boards - from requirements definition and schematic capture through layout, bring-up, validation, and field deployment. This role emphasizes full-stack PCB development, including mixed-signal design, high-speed interfaces, power distribution, and signal integrity, while supporting data acquisition, signal conditioning, estimation, and real-time processing functions critical to reactor control. Responsibilities & Duties: Own the design and development of multilayer PCBs for reactor control and instrumentation systems (terrestrial, with future space applications). Define electrical architecture for mixed-signal systems, including power distribution, analog front ends, and digital control interfaces. Design low-noise analog front-end circuits and ensure robust integration with ADC/DAC and digital subsystems. Perform schematic capture, component selection, and PCB layout with focus on signal integrity, power integrity, grounding, and EMI/EMC mitigation. Develop and review high-speed, high-precision layouts (e.g., sensor interfaces, data-acquisition paths, communication buses). Bring up, debug, and validate hardware, including board-level testing, instrumentation, and root-cause analysis. Create and execute hardware validation and qualification test plans for performance, reliability, and environmental conditions. Collaborate cross-functionally with firmware, FPGA, DSP, and responsible engineers to ensure seamless hardware/software integration. Required Qualifications & Skills: Bachelor’s degree in Electrical Engineering or a related field. 5+ years of experience designing custom PCBs, including multilayer and mixed-signal boards. Strong experience with schematic capture and PCB layout tools (e.g., Altium, Cadence, or similar). Solid understanding of signal integrity, power integrity, grounding strategies, and EMI/EMC mitigation techniques. Experience with analog and mixed-signal design, including sensor interfaces, ADC/DAC integration, and low-noise design practices. Familiarity with high-speed interfaces (e.g., SPI, I2C, UART, Ethernet) and layout constraints. Hands-on experience with board bring-up, debugging, and lab instrumentation (oscilloscopes, spectrum analyzers, VNAs, etc.). Ability to work across disciplines and support system integration in a complex engineering environment. Desired Qualifications & Skills: Master’s degree in Electrical Engineering or a related field. Experience designing for high-reliability or harsh environments (nuclear, aerospace, defense, or industrial). Familiarity with radiation effects and radiation-tolerant electronics design. Experience with power electronics or power distribution design. Exposure to FPGA or embedded systems to support hardware/software co-design. Familiarity with nuclear instrumentation or detector interface electronics. Experience with design for manufacturability (DFM), design for test (DFT), and production bring-up. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $158,000 - $219,450

Job DescriptionOverview We’re looking for a Senior Software Engineer with a passion for AI to join us in our mission of bringing the ION Factory OS to next-generation hardware builders around the globe. This role is based in Los Angeles, CA (HQ in El Segundo). Are you excited by the opportunity to build AI-powered software that accelerates the development of eVTOLs, rockets, robots, and autonomous vehicles? Responsibilities & Duties Lead the design, implementation, and optimization of production-ready AI systems within the ION Factory OS. Ship customer-facing features that directly impact manufacturing workflows, including AI-driven functionality (e.g., generative procedure creation, anomaly detection, recommendations) and core product features not reliant on AI. Architect and maintain scalable software systems, including AI/ML pipelines and broader product infrastructure. Design and implement AI features using retrieval-augmented generation (RAG) pipelines to deliver context-aware insights and recommendations. Leverage Model Context Protocol (MCP) and similar frameworks to connect AI models seamlessly with structured/unstructured data sources and external tools. Collaborate with product managers and customers to translate real-world challenges into robust software solutions. Partner with data engineering to process and transform structured and unstructured manufacturing data into usable formats. Ensure reliability, scalability, and maintainability of all systems in production, leveraging CI/CD and cloud-native workflows. Stay ahead of advancements in software engineering and AI, bringing the best practices into shipped product features. Mentor junior engineers and help raise the technical bar across the team. Minimum Qualifications & Skills 7+ years of professional software engineering experience, including 3+ years shipping AI/ML-powered products into production. Proven track record of building and shipping customer-facing applications (AI and non-AI) that deliver measurable business value. Experience architecting scalable systems on cloud platforms (AWS, Azure, GCP). Expertise in data modeling, preprocessing, and model evaluation at scale. Familiarity with generative AI models (LLMs, diffusion models, GANs) and their real-world applications. Strong knowledge of APIs and modern software design patterns for integrating AI into SaaS products. Excellent problem-solving, communication, and cross-functional collaboration skills. Passion for AI innovation paired with the ability to deliver non-AI product functionality when needed. Desired Qualifications Experience building AI systems for real-time, low-latency, or edge deployments. Familiarity with modern data governance, privacy, and compliance standards (SOC2, GDPR, ITAR). Hands-on experience with retrieval-augmented generation (RAG) for building AI systems that combine large language models with external knowledge sources. Understanding of and/or experience with Model Context Protocol (MCP) or similar emerging standards for connecting AI systems with data and tools. Customer-facing experience gathering requirements, presenting solutions, and demonstrating value. Contributions to open-source projects or published research in applied AI/ML. Experience mentoring engineers and contributing to engineering best practices. Benefits & Perks Health Insurance; medical, vision, dental, & life insurance. Paid Parental Leave. Employee Stock Option Plan. Team outings, group lunches, open office, happy hours. Paid holidays, sick days. Flexible Friday and PTO. 401K. First Resonance is an equal opportunity employer dedicated to building an inclusive and diverse workforce. First Resonance participates in E-Verify. As part of our onboarding process, a new hire's Form I-9 information will be shared with the federal government to confirm they are authorized to work in the U.S. Pay is based on factors such as (but not limited to) scope and responsibilities of the position, candidate's work experience and skillset, and location. First Resonance accelerates the speed and reliability of hardware development for companies manufacturing the next generation of hardware products. This includes space exploration, electric airplanes, autonomous vehicles, nuclear reactors, robotics, and more. We are a group of software, hardware, and manufacturing engineers that are bringing the best of modern UX and data science to an industry that has been overly rigid in its innovation. We are removing the barriers preventing radical advancement by providing tools to manufacturing engineers and operators to move information more freely, collaborate with their teams more easily, and use the power of data to predict problems and provide insights that result in better hardware quality and delivery. Compensation Range: $160K - $190K

Job DescriptionAbout Us At Arbor Energy & Resources Corporation ("Arbor Energy"), we're creating technology to power our lives while protecting the planet that sustains them. Our advanced power systems deliver clean, reliable baseload electricity with zero operating emissions—modular, fuel-flexible, and engineered for the realities of today's energy demand. At the core is a supercritical CO₂ turbine with integrated carbon capture, designed to bring carbon-neutral power online quickly at meaningful scale. Our team includes aerospace engineers, combustion experts, and systems thinkers with a shared goal: to build technology worthy of the world we want to live in. While many of us began our journeys looking to the stars, we're applying that expertise here at home to deliver dependable, emission-free baseload power and a future of lasting abundance. If you share our values and are drawn to rigorous work with lasting impact, we'd love to learn more about you. Come build what the future will run on. Steward our planet: We build for tomorrow, ensuring every bolt we tighten and every hand we lend leaves our environment stronger than we found it. Lead with Love: We champion the success of our people, partners, and planet, nurturing excellence through camaraderie and rigor. Explore the Uncharted: We embrace the unknown with curiosity, using courage and discipline to transform uncertainty into opportunity. Role Overview We're looking for a Sr. Thermodynamics Performance Engineer to own the dynamic and steady-state thermodynamic models of our direct-fired supercritical CO₂ Brayton cycle. You'll be the person who turns integrated system behavior into clear, actionable insight — running performance studies ahead of test campaigns, reconciling predictions against test data, and growing our modeling capability into a digital-twin-quality simulation platform that supports controls development, trip response, and eventual hardware-in-the-loop testing. You'll work closely with our test, combustion, turbomachinery, recuperator, fluid systems, and controls engineers. This is the simulation backbone for a first-of-a-kind power system, and the work is foundational to how we operate, validate, and scale the technology. Responsibilities • Own the integrated cycle performance model — steady-state and dynamic — for our direct-fired sCO₂ Brayton power loop, maintaining and advancing it through the hardware lifecycle, • Run performance prediction and sensitivity studies ahead of test campaigns; reconcile model output against test data to drive model refinement and surface component-level insights, • Own the architecture call on how our dynamic modeling stack should evolve over time — what platform, what fidelity, on what evidence, • Build property tables, turbomachinery map handling, heat exchanger transient models, and combustor representations appropriate to the cycle and fidelity required, • Collaborate with combustion, turbomachinery, and heat exchanger engineers to integrate component data into system-level models; collaborate with controls and software teams on closed-loop simulation and HIL planning, • Develop simulation infrastructure — scripted scenario runs, parameter sweeps, validation cases — that makes the model usable by engineers beyond yourselfRequirements, • Bachelor's degree in Chemical, Mechanical, Aerospace, Nuclear, or related Engineering field, • 6+ years of experience in cycle performance analysis, thermodynamic systems modeling, or dynamic process simulation, • Strong fundamentals in thermodynamics, fluid mechanics, and heat transfer, applied to integrated multi-component systems, • Demonstrated experience building dynamic simulation models of fluid/thermal systems in an industry-grade 1D system simulation platform — and a clear point of view on tool tradeoffs for closed-loop power cycle applications, • Working knowledge of integrated power loop equipment — heat exchanger sizing, compressor/pump curves, valve Cv, piping hydraulics — and how each shows up in dynamic response, • Programming proficiency: Python for data reduction and automation; one of MATLAB/Simulink, Modelica, or equivalent for modeling, • Strong ownership mentality and comfort driving rigorous analysis in a fast-paced startup environmentPreferred Qualifications, • Deep experience with industry dynamic simulation platforms (such as GT-SUITE, Modelica/Dymola, NPSS, Flownex, Simcenter Amesim, or equivalent) applied to turbomachinery, power cycles, or closed-loop thermal-fluid systems, • Background in nuclear thermal-hydraulics with fast-dynamic single-phase modeling experience (RELAP, TRACE, MARS, ATHLET, GAMMA, or equivalent), particularly applied to gas-cooled or sCO₂ reactor concepts, • Working knowledge of real-fluid EOS handling (REFPROP, CoolProp, Span-Wagner) and turbomachinery map interpolation near critical conditions, • History of making and defending tool/methodology decisions in a constrained engineering environment, • Experience with supercritical CO₂, closed Brayton cycles, high-pressure systems (100+ bar), or other high-density working fluids, • Experience coupling plant models to control systems for HIL testing, controller validation, FMU export, or operator training simulators, • Hands-on plant startup, commissioning, or field troubleshooting on first-of-a-kind or developmental systems, • Background in rocketry, gas turbine, advanced reactors, or high-performance turbomachinery environmentsCompensation & Benefits, • Pre-IPO stock options, • Medical, dental, and vision insurance (Arbor covers 90% for employees), • Basic life insurance fully covered, • Health savings account (HSA) with matching, • Flexible savings account (FSA), • Unlimited PTO, • 12+ company holidays, including Earth Day!, • 401(k), • Commuter benefits, • Annual learning and development stipend, • And more! Base Pay: $165,000 - $180,000 USD/year. The salary is subject to the applicant's skills, qualifications, experience, and geographic location. Our Commitment Arbor Energy is proud to be an equal opportunity employer. We evaluate qualified applicants without regard to race, religion, national origin, gender identity or expression, sexual orientation, age, marital or veteran status, disability, or any other protected characteristic under applicable law. Solving global energy challenges requires a wide range of perspectives and experiences, and we are committed to building a team that reflects the world we serve. Our hiring process is designed to be accessible, fair, and focused on the work that matters most for this role. Reasonable accommodations are available throughout the hiring process and employment—please let us know if you need one.

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. Senior Test Engineer We are seeking Senior Test Engineer to design and implement mission-critical procedures for reactor operators managing our groundbreaking nuclear microreactor technology. This role offers a rare opportunity to bridge engineering, operations, and human factors in a highly technical and regulated environment. You will collaborate with a multidisciplinary team to translate complex hardware and software designs into clear, executable, and DOE or NRC compliant procedures. Your work will ensure that Reactor Operators (ROs) and Senior Reactor Operators (SROs) can efficiently and safely execute test, commissioning, and operational activities. This position goes beyond traditional systems engineering—you will also gain hands-on experience as a Reactor Operator (RO), directly influencing the development of operational software, procedures, and digital twin simulations. Your contributions will enhance operator efficiency, safety, and real-world execution of our cutting-edge microreactors. Responsibilities and Duties: Develop and refine operational procedures that integrate both software and hardware-in-the-loop testing. Collaborate closely with engineers to improve operator interfaces, procedural workflows, and software tools. Qualify as an operator to gain firsthand experience, ensuring procedures align with real-world execution. Support testing and iterative improvements of digital twin scenarios, operator systems, and human-machine interfaces. Ensure compliance with DOE and NRC standards, maintaining strict formatting, clarity, and usability in procedural documentation. Required Skills and Qualifications: Undergraduate degree in engineering discipline. 2+ years of full-time professional experience in engineering problem-solving, including system design, analysis, or testing. Proficiency in managing or optimizing complex hardware and software processes for testing and operations. Ability to apply first principles thinking to solve problems and make decisions in uncertain or ambiguous situations. Desired Skills and Qualifications: Hands-on experience in developing technical procedures, human factors engineering, or operational interface design. Prior operations background such as mission control room operator. Background in highly regulated industries (e.g., nuclear, aerospace, aviation, maritime). Proficiency in Python, UNIX, for procedure testing within the simulator environments. Experience with human factors and user-centered instructions for operational workflows. Additional Requirements: Must be willing to work extended hours and weekends as necessary to achieve company goals. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $139,500 - $196,875

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role: Radiant is seeking a proactive and strategic Direct Procurement Manager to lead the sourcing, negotiation, and acquisition of components, materials, and services essential for our innovative micro-reactor systems. This role is pivotal in establishing and maintaining a resilient, cost-effective, and reliable supply base. As Procurement Manager, you will collaborate closely with our Supplier Development Engineers (SDEs), Engineering, Quality Assurance, and Operations teams to ensure suppliers not only meet stringent quality and technical requirements but also commercial and delivery expectations. The ideal candidate excels in a fast-paced environment, possesses strong negotiation skills, and understands the complexities of sourcing within regulated industries. Responsibilities & Duties: Strategic Sourcing: Lead the identification, evaluation, and selection of potential suppliers based on cost, quality, reliability, capacity, and strategic fit, in collaboration with SDE and Engineering teams. Negotiation: Spearhead commercial negotiations for pricing, payment terms, lead times, and other key contract terms to achieve optimal value for Radiant. Contract Management: Develop, review, and manage supplier agreements, including Master Supply Agreements (MSAs), Non-Disclosure Agreements (NDAs), and Purchase Order terms and conditions. Purchase Order Management: Oversee the complete purchase order lifecycle, from requisition review and PO placement to tracking, expediting, and closure, ensuring timely delivery of goods and services and adherence to agreed-upon quality clauses. Supplier Relationship Management: Build and maintain strong commercial relationships with key suppliers, acting as a primary point of contact for contractual and commercial matters. Cost Analysis & Optimization: Analyze market trends, supplier quotations, and total cost of ownership to identify cost-saving opportunities and drive cost reduction initiatives. Risk Management: Assess and mitigate commercial and supply chain risks, including supplier financial health, capacity constraints, and geopolitical factors. Performance Monitoring: Track and report on key procurement metrics, such as on-time delivery, cost savings, purchase price variance, and supplier responsiveness. Collaborate with SDEs on holistic supplier performance scorecards. Cross-functional Collaboration: Work seamlessly with SDEs to integrate technical and quality requirements into the sourcing and procurement process. Liaise with Engineering, Quality, and Project Management to understand needs, resolve supply issues, and support program timelines. Process Improvement: Contribute to the development and refinement of procurement policies, procedures, and systems to enhance efficiency and compliance. Deliverables: Successfully negotiated contracts and favorable terms with critical suppliers. Managed portfolio of purchase orders ensuring on-time delivery aligned with project schedules. Demonstrated cost savings and avoidance through effective negotiation and sourcing strategies. Comprehensive supplier performance reports focusing on commercial and delivery metrics. Effective mitigation plans for identified supply chain risks. Streamlined procurement processes supporting Radiant's operational needs. Strong collaborative relationships established internally (SDE, Eng, QA, Operations) and externally (suppliers). Required Qualifications & Skills: Bachelor’s degree in Supply Chain Management, Business Administration, Engineering, or a related field. 3–8 years of relevant experience in procurement, strategic sourcing, or supply chain management, preferably within manufacturing or technology sectors. Proven track record of successful negotiation and contract management. Strong understanding of procurement processes (e.g., RFQ/RFP, PO management, supplier evaluation). Excellent analytical, organizational, and problem-solving skills. Strong interpersonal and communication skills (written and verbal). Proficiency with ERP/MRP systems and standard office software. Ability and willingness to travel occasionally to supplier locations (up to 30%). Desired Qualifications & Skills: Experience conducting supplier audits, product and process inspections, and investigations. Familiarity with quality management systems (e.g., ISO 9001, AS9100) and their implications for procurement. Understanding of supply chain dynamics within the energy or nuclear sector. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $85.5K - $168K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a Principal Electrical Engineer with deep expertise in PCB design to define and lead the electrical architecture for terrestrial reactor control systems, with a long-term path toward space reactor applications. You will serve as the foremost technical authority for custom hardware across the organization — setting design standards, driving architecture decisions, and owning the end-to-end development of high-reliability, low-noise printed circuit boards from requirements definition and schematic capture through layout, bring-up, validation, and field deployment. This role emphasizes full-stack PCB development, including mixed-signal design, high-speed interfaces, power distribution, and signal integrity, while supporting data acquisition, signal conditioning, estimation, and real-time processing functions critical to reactor control. As a principal-level contributor, you will shape the technical roadmap for Radiant's hardware platform and mentor engineers across the electrical team. Responsibilities & Duties: Own the design and development of multilayer PCBs for reactor control and instrumentation systems (terrestrial, with future space applications). Define and own the electrical architecture strategy for mixed-signal systems, including power distribution, analog front ends, and digital control interfaces. Design low-noise analog front-end circuits and ensure robust integration with ADC/DAC and digital subsystems. Perform schematic capture, component selection, and PCB layout with focus on signal integrity, power integrity, grounding, and EMI/EMC mitigation. Develop and review high-speed, high-precision layouts (e.g., sensor interfaces, data-acquisition paths, communication buses). Bring up, debug, and validate hardware, including board-level testing, instrumentation, and root-cause analysis. Create and execute hardware validation and qualification test plans for performance, reliability, and environmental conditions. Collaborate cross-functionally with firmware, FPGA, DSP, and responsible engineers to ensure seamless hardware/software integration. Provide technical leadership and mentorship to junior and senior electrical engineers; lead design reviews and own hardware risk identification and mitigation. Required Qualifications & Skills: Bachelor's degree in Electrical Engineering or a related field. 8+ years of experience designing custom PCBs, including multilayer and mixed-signal boards. Demonstrated experience setting electrical architecture direction and driving decisions across complex, multi-disciplinary programs. Strong experience with schematic capture and PCB layout tools (e.g., Altium, Cadence, or similar). Solid understanding of signal integrity, power integrity, grounding strategies, and EMI/EMC mitigation techniques. Experience with analog and mixed-signal design, including sensor interfaces, ADC/DAC integration, and low-noise design practices. Familiarity with high-speed interfaces (e.g., SPI, I2C, UART, Ethernet) and layout constraints. Hands-on experience with board bring-up, debugging, and lab instrumentation (oscilloscopes, spectrum analyzers, VNAs, etc.). Ability to work across disciplines and support system integration in a complex engineering environment. Desired Qualifications & Skills: Master's degree in Electrical Engineering or a related field. Experience designing for high-reliability or harsh environments (nuclear, aerospace, defense, or industrial). Familiarity with radiation effects and radiation-tolerant electronics design. Experience with power electronics or power distribution design. Exposure to FPGA or embedded systems to support hardware/software co-design. Familiarity with nuclear instrumentation or detector interface electronics. Experience with design for manufacturability (DFM), design for test (DFT), and production bring-up. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $200,500 - $314,475

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking an Operations Planner responsible for the resource management, production scheduling, and forecasting and planning to ensure production build plans, procurement activities, and operational deliverables align with and meet company milestones. This role focuses on ensuring the availability of material, equipment, and manpower to support internal and external production activities, aligning these activities with build schedules, and coordinating material movement through internal work centers. The Production Planner will work closely with supply chain, warehouse, quality, engineering, and internal manufacturing teams to ensure material and internal fabrication readiness and outside processing activities are coordinated to support build execution. The ideal candidate is highly detail-oriented, proactive, and capable of coordinating cross-functional teams to solve operational problems quickly. Responsibilities & Duties: Production Planning Work with manufacturing engineering to maintain daily, weekly, and monthly build plans based on milestones, hardware availability, and internal capacity. Analyze demand forecasts, capacity, and material availability to generate predicted throughput and monitor supporting activity completion. Develop and maintain production schedules for manufacturing work centers. Sequence jobs to maximize throughput and minimize changeovers. Material Availability Management Work with supply chain and engineering to ensure accurate demand forecasts, material readiness, and build plan completeness. Maintain visibility of build readiness status and escalate risks that could impact build schedules. Monitor inventory levels and system availability to ensure materials are available for production builds. Work with quality teams to prioritize inspection runs and activities needed to release material needed for production. Internal Production & Outside Processing Coordination Coordinate and track internal production activities required to support production builds. Monitor progress of internally fabricated components and ensure machining operations align with production priorities. Manage and track outside processing (OSP) activities including heat treatment, plating, coatings, specialty machining, cleaning, welding, inspection, and other vendor-based processing steps. Ensure materials requiring outside processing are scheduled, shipped, tracked, and returned in alignment with build schedules. Work with manufacturing and supply chain teams to resolve delays or capacity constraints affecting internal or external production steps. Coordinate with internal manufacturing teams when subassemblies must be built to meet higher level assembly targets. Data Integrity & Process Improvement Maintain and refine production, piece part, and assembly data to maintain accurate forecasting. Investigate part number mismatches, BOM discrepancies, or inventory data issues. Track actual production vs planned schedule to identify adherence discrepancies. Improve processes related to production forecasting, planning, and production throughput. Develop dashboards or tracking tools to improve visibility into production material readiness. Required Qualifications & Skills: Bachelor’s degree in Supply Chain, Operations, Engineering, Business, or related field. 2+ years of experience in production planning, materials planning, manufacturing coordination, or supply chain operations. Strong understanding of BOM structures, inventory management, and production material flow. Experience working with ERP/MRP systems for production planning and inventory management. Strong analytical and problem-solving skills with the ability to identify root causes of material availability issues. Excellent cross-functional communication and coordination skills. Desired Qualifications & Skills: Experience working with machine shops, fabrication operations, or manufacturing environments. Familiarity with outside processing (OSP) workflows such as heat treatment, coatings, inspection or specialty finishing. Experience supporting production kitting or manufacturing build readiness. Familiarity with quality inspection processes, MRB workflows, or manufacturing run closures. Experience improving operational processes in fast-moving production environments. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $115K - $168K

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a talented Principal Power Systems Engineer to lead the design, modeling, and validation of electrical power systems supporting our nuclear microreactor platform. You will play a critical role in defining how power is generated, conditioned, controlled, and delivered to customers across grid-connected, islanded, and rapidly deployable environments. In this role, you will own power system studies from early architecture tradeoffs through detailed modeling, testing, and system validation. You’ll collaborate closely with electrical design, controls, turbomachinery, nuclear, thermal, and software teams to ensure safe, stable, and reliable power delivery under a wide range of operating and contingency conditions. This role is central to commercializing Earth’s first mass-produced portable nuclear reactors. Responsibilities & Duties: Own power system architectural design for microreactor-based power generation systems operating in grid-connected and islanded modes. Develop single-line diagrams of the power system for single- or multiple-reactor configurations. Develop FMEAs to identify system behavior during component/system failures and identify redundancy paths. Evaluate system behavior during disturbances such as load steps, faults, breaker operations, and loss-of-generation events. Size energy storage systems for reactor cold start and variable load demands. Own synchronization of multiple reactors in a microgrid and multiple reactors tied to grid. Collaborate cross-functionally with the power conversion team to understand generator requirements and design power systems that can integrate seamlessly. Participate in software-in-the-loop (SIL), hardware-in-the-loop (HIL), and system-level testing to validate/verify system performance. Support system checkouts, commissioning, and testing of all power requirements Regulatory compliance of power systems, including testing methods to verify power quality. Required Qualifications & Skills: B.S. in Electrical Engineering with an emphasis in power systems or control systems. 5+ years of experience designing power systems for generation, microgrids, or mission-critical power systems. Experience with sizing and integrating high-voltage battery systems with power electronics. Strong experience with power system modeling and simulation tools (e.g., PSCAD, ETAP, PSS®E, Simulink, or equivalent). Solid understanding of inverters, grid converters, DC/DC converters, rotating generation, and power system control modes (grid-forming, grid-following, droop control). Experience in analyzing system stability, protection behavior, and fault response in complex electrical systems. Ability to clearly communicate technical concepts and results to cross-functional teams. Desired Qualifications & Skills: M.S. in Electrical Engineering or related discipline. Experience in power electronics development for high-power, medium-voltage equipment, including transformers, switchgear, inverters, active rectifiers, DC/DC converters, and generator controls. Experience with islanded power systems supporting critical loads. Familiarity with interconnection requirements, grid codes, and relevant IEEE or utility standards. Experience in modeling dynamic loads and fast-changing electrical demand. Exposure to nuclear, aerospace, defense, or other highly regulated industries. Experience mentoring junior engineers or leading technical efforts on complex programs. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at Radiant’s El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $200,500 - $314,475

Job DescriptionAbout Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. About the Role Radiant is seeking a FP&A Director to build and lead our financial planning and analysis function. We have strong finance fundamentals across reliable monthly close, clean audits, functioning AP, but we are looking for a leader to drive conversion of financial data into strategic insights and operational decisions. This role will bridge the gap between our accounting foundation and the investor-grade reporting required to support significant capital deployment, production ramp, and aggressive headcount growth. This is a build role. You won't inherit mature systems or a defined playbook - you'll help create them. You'll need to navigate ambiguity while earning credibility with senior technical and operational leaders. Responsibilities & Duties: Financial Reporting Design and deliver monthly reporting packages that answer key operational questions and drive strategic insights. Build consistent and timely departmental P&L views with variance analysis and trend identification. Create program-level financial views that track prototype development, production units, and overhead. Develop M/M and YTD trend analysis across all business units. Translate complex financial results into clear narratives for leadership and the Board. Support quarterly board materials and investor updates. Support regular reporting across treasury yields and cash management strategy. Budgeting & Forecasting Deliver monthly budget vs. actual variance reporting with actionable insights for internal and external stakeholders. Lead monthly rolling forecast process to update outlook based on current business trajectory. Support annual budget process including bottoms-up planning and scenario modeling. Create self-service dashboards that enable department heads to monitor their performance Scenario Planning & Strategic Analysis Conduct sensitivity analysis on key business drivers and help leadership understand trade-offs. Support strategic decision-making around hiring pace, capital deployment, and investment priorities. Evaluate make vs. buy decisions and provide financial perspective on build-out plans. Marry schedule progress with spend on long-lead procurement to assess schedule risks. Unit Economics & KPI Development Develop unit economics models for our microreactor products, tracking cost evolution from prototype through commercial production. Define and track key performance indicators across engineering, operations, and G&A functions. Build KPI dashboards with weekly, monthly, and quarterly reporting cadence. Partner with operations to track metrics that connect financial performance to operational execution. Cross-Functional Partnership Partner with supply chain and operations on procurement planning and spend analysis. Work with engineering leads to understand program timelines and resource requirements. Collaborate with accounting to ensure data quality and alignment on reporting. Support HR on headcount planning and organizational design decisions. Required Qualifications & Skills: 8+ years finance experience, with 4+ years in FP&A or strategic finance roles. Demonstrated experience building FP&A infrastructure from scratch (not just inheriting mature systems). Experience at a high-growth company navigating significant scale and complexity. Strong financial modeling skills; comfortable working with ambiguity and imperfect data. Track record of cross-functional partnership, particularly with operations and technical teams. Excellent communication skills with ability to translate financial concepts for non-finance audiences. Desired Qualifications & Skills: Hardware, manufacturing, or aerospace/defense industry background. SQL or BI tool proficiency (Power BI, Tableau, Looker). Experience building or leading a team. What We're Looking For: Team player: willing to be an individual contributor initially while building toward leading a team. Builder mentality: creates from scratch rather than waiting for perfect systems. Strategic thinking: sees beyond the numbers to understand business implications. Operational mindset: understands that finance should enable faster, better decisions. Technical credibility: can earn trust with engineers and operations leaders. Comfortable with ambiguity: thrives in early-stage environments where playbooks don't exist. Additional Requirements: Must be willing to work extended hours and weekends as necessary to accomplish our mission. Must work 100% onsite at El Segundo HQ. Benefits and Perks Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans. One Medical: Sponsored memberships for employees and their dependents. Vision: 100% top tier plan coverage + 50% for dependents. Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits. 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees. Daily catered lunch. Free snacks and drinks. Flexible PTO policy. Remote workday allocation. Company and team-bonding events, happy hours and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. Total Compensation and Benefits Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant. The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com. We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. Unfortunately, we are unable to provide visa sponsorship at this time. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls. Compensation Range: $123,000 - $236,250