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Full Stack Developer - GenAI 6-month contract | Inside IR35 | Up to £800 per day | 2-3 days per week in London A global pharmaceutical client is growing their Responsible AI function and looking for a Full Stack Developer to help build and visualise GenAI applications that evaluate LLM safety, performance, and output explainability. This role suits someone who enjoys working across both frontend and backend systems, connecting AI models to real-world user interfaces and data pipelines. What you'll be doing: * Develop and deploy full stack features (Python backend, React frontend) * Integrate LLM and GenAI components into the product ecosystem * Conduct user research to understand risk and usability in AI systems * Contribute to agile development cycles and code reviews Key Skills: Python, React, TypeScript, Git/GitHub, cloud infrastructure (GCP), agile development, automated testing Nice to Have: Experience with AI safety evaluations, LangGraph, PydanticAI, or AutoGen frameworks Ideal for: Full stack engineers interested in building user-facing AI tools and safety-focused GenAI systems. Desired Skills and Experience Python, React, TypeScript, Git/GitHub, cloud infrastructure (GCP), agile development, automated testing

Role: Senior Product Engineer (Fullstack) Salary/Package: £90k-£130k + Equity Options Company Sector: AI Start Up Experience Level: Senior (5+ years) Tech: JavaScript, TypeScript, Node.js, React.js, AWS Location: Central London Working Arrangement: 5 Days a week in the office Product Engineer (Full Stack) Help shape the future of human–computer interaction by building fast, delightful, intelligent products. We’re looking for a product-focused engineer who loves bringing ideas to life in a fast-moving, collaborative environment. You’ll work across the stack to design, build, and launch new features - the kind that make users go, “Whoa, that’s smart.” This role is ideal for someone who thrives in early-stage environments, loves zero-to-one product building, and enjoys taking full ownership from concept to delivery. What you’ll do • Build new user-facing features end-to-end - from idea to production, • Experiment rapidly with prototypes and iterate based on user feedback, • Optimise for performance, scale, and reliability, • Collaborate closely with engineers, designers, and product leads to craft elegant, high-impact solutions What you bring • Strong experience building full-stack web applications, • Proficiency with TypeScript, Node.js, and React (experience with tools like Tailwind, Radix, or Framer Motion is a plus), • Solid understanding of Postgres or similar relational databases, • Exposure to cloud infrastructure (AWS or similar; Terraform a plus), • A genuine interest in AI and emerging technologies Who you are • A builder at heart - you love shipping, • Excited to work in-person from a central London office, • Energised by startup pace and ambiguity, • Pragmatic, kind, and ambitious in equal measure, • Driven by creating meaningful user experiences Why this role This is a chance to join an early team shaping the next generation of productivity tools. You’ll work hands-on with cutting-edge AI and help define both the product and the culture from the ground up. My client offers above-market compensation (salary and equity) and relocation support for those joining us in London. If this sounds like you, even if your background doesn’t tick every box we’d love to hear from you.

🚀 Senior Frontend Engineer – Next.js / React Location: Monument WeWork in London Type: Full-Time About Admanage.ai We’re building the Cursor for ad management. Admanage.ai helps companies launch ads 10x faster on Meta & TikTok. Created by top performance marketers who’ve managed over $50M+ in ad spend. Our mission? Level the playing field by giving every business access to enterprise-grade ad automation tools. We make it easy to launch hundreds of ads in seconds, saving advertisers hours. And we’re building AI-powered tools to programmatically create, launch, and manage ads, which is where you come in. We’re profitable, fast-moving, and backed by experience, not just ideas. We commit to GitHub multiple times a day and ship continuously. Why This Role Rocks This is a senior-level frontend role where you’ll design and deliver features that directly impact how the top advertisers launch and manage hundreds of thousands of ads per month. You’ll collaborate with the founding team (ex-Photoroom, ex-ZOE, ex-Nextdoor), shape our frontend architecture, and raise the bar for state management, testing, and performance. You’re not here to maintain, you’re here to build a complex UI that’s robust and well-tested. 🔧 Tech Stack Frontend: Next.js 14, React 18, TailwindCSS, Radix UI, Framer Motion State Management: Zustand Testing: Vitest Backend (light exposure): Node.js, Prisma, MySQL Infra: R2 Cloudfalre, AWS S3, Vercel Auth: NextAuth.js APIs: Facebook Marketing API, TikTok Ads API What You’ll Do Architect and scale the frontend for an app launching 500,000+ ads/month Implement robust state management to handle complex, async, and data-heavy workflows Build production-grade testing frameworks (unit, integration, E2E) to support safe continuous deployment Ship features end-to-end: idea → build → optimize for robust testing, speed and UX You Might Be a Fit If You… Have 5+ years building production React/Next.js apps Are skilled at state management in large, complex apps Believe testing is part of building, not an afterthought Care about performance, UX, and clean design systems Communicate clearly, move fast, and thrive in a startup culture 💡 Bonus Points For Experience with ad APIs (Meta, TikTok, IG) Prisma + MySQL experience CI/CD pipeline knowledge (Vercel, GitHub Actions) 💰 Perks & Benefits Thirdspace Gym membership Competitive Salary 25 days holiday + bank holidays WeWork Office in Monument Team offsites (Past: Canada, South England) Join Us If You Want To… ✅ Build alongside experienced engineers and founders ✅ Work with a modern stack and ship fast ✅ Solve hard UX and state management challenges in adtech ✅ Own what you build and shape our engineering culture ✅ Grow into a Lead role as the company scales How to Apply Send your GitHub, LinkedIn, and 2-3 lines on the hardest frontend problem you’ve solved lately. Bonus: links to anything you’ve built that makes you proud. Interview Process We start with a take home task where you’ll be asked to identify bugs in a sample github repo and indicate how you would fix it.

Are you a seasoned full-stack developer ready to lead with NodeJS, React, and modern PHP? Looking for a senior-level role where your code powers real-time, high-traffic platforms? Want to shape scalable architecture while mentoring others in a high-performing tech team? Our client is hiring a Senior Software Developer to take a hands-on, influential role in building scalable, event-driven applications used by global audiences. If you're fluent in NodeJS, ReactJS, and PHP 8+, and want to stretch your expertise within a collaborative and ambitious engineering environment - this role was made for you. Why This Role is Great • Own complex, high-impact projects—you’ll be trusted to design and deliver performant systems in production environments., • Work across the full stack with NodeJS (NestJS), ReactJS, and modern PHP frameworks like Laravel or Symfony., • Make architectural decisions and contribute to the evolution of event-based platforms using CQRS and microservices., • Be a mentor and leader—share your experience with teammates and contribute to a strong culture of knowledge-sharing., • Collaborate cross-functionally with Product, DevOps, and Data to deliver real-time, scalable systems., • Balance innovation with performance, continuously improving while delivering reliable, observable solutions. About You You’re already confident working with: • NodeJS + TypeScript (ideally with NestJS or similar frameworks), • ReactJS for modern frontend development (hooks, component design, etc.), • PHP 8+ with hands-on experience in Laravel, Symfony, or equivalent frameworks You’ll bring: • Solid understanding of event-driven architecture and CQRS, • Experience working on high availability, high throughput platforms (ideally OLTP), • Strong working knowledge of AWS services such as Aurora, MSK Kafka, ECS, and EMR, • A track record of building efficient, scalable database queries in MySQL and working with multiple data paradigms (RDBMS, Document, KV Stores), • Proficiency with DevOps tools, Docker, CI/CD pipelines, and modern development practices, • Confidence writing unit and integration tests as part of your everyday workflow, • A mindset of ownership, excellence, and clear communication This is a role for someone who already brings strength in all three core technologies—NodeJS, React, and PHP—and is ready to hit the ground running. The Perks You’ll join a supportive, fast-moving team with benefits that support both your growth and well-being: • Career acceleration via robust L&D programmes and clear progression paths, • Regular performance feedback through an innovative performance tool, • Private medical and dental cover, • Pension, life assurance, and income protection, • Cutting-edge tech and tools, • Retail discounts and wellbeing initiatives, • Green vehicle salary sacrifice scheme, • Restricted Stock Units as part of your annual bonus package Inclusion & Diversity Humand Talent Solutions and our client are passionate about creating inclusive, empowering work environments. We actively welcome applications from all backgrounds and ensure a fair, accessible process for every candidate. We celebrate individuality and difference—because diverse teams build better tech.

🚨 Full Stack Product Engineer – SaaS Startup 🚨 We’re excited to partner with a profitable SaaS startup experiencing rapid growth and strong ARR in a short timeframe. Due to increasing customer demand, they’re expanding their engineering team and looking for product-minded engineers to join them on their journey. 💼 Role Details Title: Senior Product Engineer Location: Hybrid – 3 days/week in Central London office Salary: Up to £120k + Equity Tech Stack: Go, TypeScript, React (open to other strong technical backgrounds) ✅ What They’re Looking For • Engineers who think like product owners, • Prior startup success or fast-paced environment experience, • A background in top-tier education or equivalent proven ability 🌟 Why This Role? • Join a high-growth, product-led team, • Build features that directly impact customer success, • Work with a smart, driven team and cutting-edge tech 🚨 Full Stack Product Engineer – SaaS Startup 🚨

Company Description At Affinity Labs, we’re building the future of company creation, a full-stack AI venture studio that partners with content creators to co-found authentic, scalable software businesses. By combining AI-native development with creator-led distribution, we're pioneering a new model of monetization by to rapidly build, launch, and scale digital ventures aligned with creators and their audiences. We aim to launch ventures 10x faster and cheaper than traditional methods using our internal "AI factory": a multi-agent architecture, reusable component libraries, and a growing knowledge graph that learns from every product we ship. Role Description This is a full-time on-site role for a Founding Engineer, located in the London Area, United Kingdom. The Founding Engineer will be responsible for leading the technical development of new software products, collaborating closely with content creators and their management teams, and implementing AI-driven solutions. The role also involves hands-on coding, system architecture design, and ensuring scalability and reliability of the software. The Founding Engineer will work in a fast-paced, dynamic environment and contribute to the overall strategy and growth of digital ventures. Responsibilities • Code with AI-first speed. Use AI to turn product specs into production-ready React, Supabase, and serverless back-ends in days, not weeks., • Architect for scale (and scrappiness). Apply clean, hexagonal patterns so v1 can evolve without rewrites., • Prototype → pilot → product. Move fast through validation loops: hack the MVP, shadow users, ship the fix, repeat., • Wear many helmets. One sprint you’re spinning up CI/CD; the next you’re tweaking prompts or jumping on a creator livestream to debug user feedback in real time., • Set the engineering culture. Establish the rituals, docs, and testing standards that future hires will learn from you. Requirements • Full stack developer, • AI-native developer that has used or experimented with the latest AI development tooling, • Strong coding and software development skills in languages and with tools such as ReactNative / Flutter / Next.js, Supabase / Postgres, Python, • Experience in system architecture design and implementation, • Knowledge of AI technologies and machine learning algorithms. You track the latest AI tools, play with new MCPs, and deploy multi-agent systems, • Experience in startup environments and rapid product development, • Bachelor's or Master's degree in Computer Science, Engineering, or related field, • Action oriented with strong bias toward rapid execution and experimentation. Nice to Have's • Prompt-engineering or fine-tuning experience, • Familiarity with Stripe, Discord, TikTok or other creator-economy tools, • Side hustle, hackathon wins, or open-source contributions, • Shipping Experience: You’ve shipped AI side projects, or research, that prove you can learn fast and finish. Why this role is a-career launchpad • Own the code & the company. You step in as Founding Engineer #1, receiving a meaningful equity stake from day one., • Ship faster with AI at your side. We’ve baked AI tools into our workflow so you spend time solving problems, not yak-shaving boilerplate., • Ride a rocket, not a conveyor belt. Affinity Labs is a venture studio that partners with top content creators to turn influence into scalable software. Think “Prime for software”, • Grow like crazy. You’ll architect, build, and launch multiple products each year. The shipping reps you’ll get in 12 months here would take 3 - 4 years in a typical startup., • Learn from builders, not bosses. You’ll work shoulder-to-shoulder with a founding team that has scaled VC-backed startups, closed multi-million-pound term sheets, and shipped products used by millions.

Software Engineer - Financial Services A leading UK bank is seeking Full Stack Engineers to join its new tech hub and help redefine engineering excellence. In addition, the bank is focused on bridging the gap between product management and hands-on engineering, while fostering a culture of continuous improvement. What You’ll Do: • Design, architect, and develop industry-leading software solutions using a variety of programming languages, frameworks, and tools., • Deliver high-quality, complex software that enhances and elevates the engineering standards across the bank., • Contribute to every stage of the software development lifecycle, from initial development through rigorous testing and successful deployment to production., • Work closely with product teams, business stakeholders, and other technical experts to create strategic solutions that ensure seamless integration and exceptional outcomes. Key Priorities: • Proficiency in Java and AWS, • Experience with Salesforce development and React, • A strong focus on engineering efficiency, including knowledge of DORA metrics, DevOps methodologies, and practices like TDD or BDD, • An ambitious growth mindset, eager to innovate and drive change Reports directly to the Engineering Lead, working closely to align on strategic goals and drive technical excellence across the team. Apply now and thrive in a fast-paced, collaborative environment with clear goals and exciting ambitions.

About Us: We’re a VC-backed stealth-mode company building behavioural AI solutions for the retail industry. Our platform is designed from the ground up — no legacy, no patchwork systems — just a clean slate and a clear vision. Our mission is to bring the intelligence of modern machine learning directly to the in-store shopping experience. Role: We’re looking for an experienced Backend Engineer to work closely with product, design, mobile, and machine learning team members to design & build experiences that re-define in-store shopping. You'll help help build engaging & intuitive web experiences and the event-driven & real-time backend services that power them. You’ll work across the backend stack, real-time data flows and APIs on a backend designed for scale & flexibility. Responsibilities: • Contribute to distributed, event-driven backend services connecting our web experience with information from remote devices and external data sources., • Build and document APIs (OpenAPI/AsyncAPI) for mobile and web clients, • Model and manage structured and semi-structured data across storage layers, • Integrate AI-driven personalisation and real-time insights into user flows, • Contribute to overall system design: service boundaries, data ownership, scaling, and observability Essential Qualifications: • Built modern full-stack applications w/ focus on backend (Python/Java/Go), • Worked with a variety of storage technologies (eg. Postgres, Mongo, Redis, Object), • Experience with async and bi-directional communication protocols and patterns (eg. WebSockets, SSE), • Designed and implemented event-driven distributed systems (eg. Kafka/Pulsar, RabbitMQ, MQTT, or similar), • Experience with container orchestration and service containerisation (Kubernetes, Docker), • Built and deployed services on any major cloud providers' services (Azure, GCP, AWS), • AI-Native development: use AI tools such as CoPilot or Cursor a collaborator and accelerator of development. Nice to Have: • Experience in frontend development (eg. Javascript, Typescript, React.js), • Worked with real-time data collection and/or processing, • Worked in an IoT or Edge-oriented architectures, • Experience or knowledge in retail POS, inventory, or loyalty systems

I'm looking for an exceptional Java developer to join SpectrAxe — the first true all-to-all, anonymous FX options trading platform. If you have very strong middle-tier development skills (and/or full-stack experience with React) and are ready to take the next step in your career — where your work has real impact in a fast-moving, startup environment — I'd love to hear from you. Knowledge of FX options is advantageous but not essential. If you bring strong development skills, we’ll support you in learning the financial and trading aspects of the platform. This is a chance to help shape the evolution of a live trading platform used by institutional clients globally. Get in touch to discuss the role. You’ll Be Working On: • Designing and developing Java-based applications & microservices, • Using algorithms, Collections, Streams, and concurrency in Java 11+, • Building services with the Spring Framework, • Writing robust tests with JUnit4/5 & Mockito, • Developing with PostgreSQL, optimising for performance, • Using Docker & CI/CD tools to deliver production-quality releases We’re Looking For: Strong Java 11+ skills (Collections, Streams, Concurrency) Solid understanding of algorithms & data structures Spring Framework experience JUnit & Mockito testing experience PostgreSQL expertise Familiarity with Docker & CI/CD (Jenkins, GitHub Actions, etc.) Bonus Points For: • Financial services , trading systems background, • Messaging systems (RabbitMQ, Kafka), • AWS or other cloud platforms, • TypeScript, RxJS, GWT, React, • Low-latency system design experience What we offer • Competitive salary & bonus, • Hybrid working (2–3 days in London office), • Work on a cutting-edge fintech platform with global impact, • Collaborative, innovative, and supportive team environment

Crossing Hurdles is a recruitment firm. We refer top candidates to our partners working with the world’s leading AI research labs and fast-growing startups to help build cutting-edge technology. Role: LLM - Sr. Software Engineer – LLM Evaluation & Repository Validation Type of Role: Short-term Contract Engagement Duration: 1 month (with possible extensions) Commitment: 10–40 hrs/week (flexible, partial PST overlap required) Start Date: Immediate Rate Range: $80–$125/hour Project Overview We’re building high-quality evaluation and training datasets to improve how Large Language Models (LLMs) interact with realistic software engineering tasks. Engineers will work on diverse projects such as enabling models to traverse complex code bases or building agents that boost model performance. Role Overview — What Does a Typical Day Look Like? • Work across multiple projects aimed at improving LLM performance on code., • Lead and deliver end-to-end agent use cases (e.g., home automation agents, coding copilots, creative design assistants)., • Collaborate with the team to identify edge cases and ambiguities in model behavior., • Review and compare 3–4 model-generated code responses per task using a structured ranking system., • Evaluate code diffs for correctness, quality, style, and efficiency., • Provide clear, structured rationales for evaluation decisions. Required Skills & Experience • Several years of software engineering experience, including 1+ continuous years at top-tier product companies (e.g., Google, Stripe, Amazon, Apple, Meta, Microsoft, Datadog, Dropbox, Shopify, PayPal, IBM Research)., • Strong expertise in full-stack application development and deploying scalable, production-grade software., • Deep understanding of software architecture, debugging, and code quality assessment., • Proven ability to review code diffs and evaluate correctness, maintainability, and efficiency., • Proficiency in backend languages (Java, Rust, Go, Node, Python, C++) and frontend frameworks (Typescript, JavaScript, React, Vue, Angular, jQuery)., • Excellent oral and written communication skills. P.S. After applying, within 1–2 days, you will hear from us via email and LinkedIn InMail, so please keep track of it.

As a Principal / Lead Full-Stack Engineer, you'll thrive if you're hands-on, grounded, and passionate about building with technology. This role is ideal for those looking to have a large impact and huge scope for growth, while still being hands on with technology. We aim to allow growth without becoming “post-technical”. Our clients diverse tech stack includes TypeScript, Java, .Net, Scala, Kotlin, Golang, Elixir, Python, .Net, Node.js, and Rust. Experience with one, or more than one of those languages would be preferred. We focus on lean teams without traditional management layers, working in small, collaborative teams (2-5 people) where a well-founded argument holds more weight than the years of experience. Responsibilities: • Lead engagements when working with customers across domains like retail, banking, publishing, social, education, adtech and more, • Remain fully hands-on and write high-quality, production-ready code that enables smooth deployment of solutions, • Drive architectural and design decisions, ensuring scalable, resilient systems built on sound engineering principles and best practices, • Partner with clients to define and evolve their technology and data strategy, modernizing infrastructure, architecture, and technology stacks, • Utilize DevOps tools and practices to automate and streamline the build and deployment processes, • Work closely with Data Scientists and Engineers to deliver robust, production-level AI and Machine Learning systems, • Develop frameworks and tools for efficient data ingestion from diverse and complex sources, • Operate in short, iterative sprints, delivering working software aligned with clear deliverables and client-defined deadlines, • Demonstrate flexibility by learning and working across multiple programming languages and technologies as required Additional Responsibilities: • Actively contribute to a high-performing engineering culture by working from ours or client offices regularly to collaborate closely with fellow senior techies, fostering strong technical discussions and decision-making, • Provide hands-on mentorship and technical guidance that encourages knowledge sharing, continuous improvement, and innovation within your team Skills you’ll need: • Demonstrated experience as a Principal or Lead Software Engineer, • Experience in leading architecture and design decisions, ensuring adherence to best practices in technology choices and system design, • Deep understanding of programming fundamentals and expertise with at least one programming language (functional or object-oriented), • A nuanced and rich understanding of code quality, maintainability and practices like Test Driven Development, • Experience with one or more source control and build toolchains, • Working knowledge of CI/CD will be an added advantage, • Understanding of web APIs, contracts and communication protocols, • Understanding of Cloud platforms, infra-automation/DevOps, IaC/GitOps/Containers, design and development of large data platforms, • A maker’s mindset - To be resourceful and have the ability to do things that have no instructions What will you experience in terms of culture at Sahaj? • A culture of trust, respect and transparency, • Opportunity to collaborate with some of the finest minds in the industry, • Work across multiple domains What are the benefits of being at Sahaj? • Unlimited leaves, • Life Insurance & Private Health insurance paid by Sahaj, • Stock options, • No hierarchy, • Open Salaries

Ruby Fullstack Engineer, Mid-Level Hayes, London Hybrid We are looking for someone with 2+ years of experience in web application development to join our growing tech team. We value autonomy and initiative, and are passionate about building scalable, high-quality web applications. This role is focused on writing reliable code, testing, and ensuring minimal downtime. Bonus points if you’ve worked on improving code quality and productivity through applied technical patterns! As the UK’s only B Corp Certified salary sacrifice provider, we’re transforming the future of electric vehicle adoption in the UK through salary sacrifice. Building on that success, we’ve launched The Charge Scheme – an innovative benefit allowing employees to save 20–50% on EV charging via salary sacrifice. Voted 4.9 on Glassdoor and certified by Welcome To The Jungle, it’s never been a more exciting time to join! Key Responsibilities: • Develop, evolve, and maintain our core web application using Ruby, Rails, React, and TypeScript., • Collaborate closely with product managers and other stakeholders to deeply understand business needs and translate them into technical solutions., • Contribute actively to our technology roadmap and priorities, working alongside your team members, key stakeholders, and leadership., • Build a highly automated and reliable platform that serves both our external customers and internal teams., • Take on ambiguous or loosely defined problems, analysing them, and proposing effective technical approaches and solutions. About you: • 2+ years of professional experience building web applications using Ruby, Rails, React, and TypeScript., • Strong backend development skills with a willingness to contribute across the full stack (frontend, infrastructure, etc.)., • Proactive and self-driven, able to take ownership of tasks from conception to deployment., • Excellent communication skills, capable of translating complex technical concepts into clear, understandable language for non-technical colleagues., • Experience with various testing methodologies (e.g., unit, integration, end-to-end) and a commitment to writing well-tested code., • A commitment to robust and reliable software delivery, including familiarity with practices like no-downtime deployments, proactive monitoring, and identifying potential risks. Benefits: • Hybrid working with 2 days in the office (Hayes, London), • 25 days holiday plus bank holidays, • Add 1 day holiday per year service + buy / sell up to 5 days each year, • Flexible work policy with options to take into account family care, • Best in class Family Friendly Leave and Pay, • Use our own scheme to lease a vehicle through salary sacrifice and save 40-70% to drive a brand new electric car, • £500 pa. personal development budget, • £100 home office budget, • Bupa healthcare, • Equity options - own a part of the business

Software Engineer Key Technologies: C#, SQL, React, Bloomberg, Fidessa, FactSet APIs London Perm Role | 4 Days Onsite £55,000 - £65,000 Harrington Starr has partnered with a well-established London based Investment Bank to find a Full Stack Developer at the Associate level. This is a hands-on development role, supporting a range of internal systems across trading and business operations. Key Responsibilities: • Develop and maintain software using C#, SQL, and React, • Integrate real-time and historical data from third-party APIs, • Follow agile sprint plans and deliver reliable, secure solutions, • Ensure systems meet regulatory and cybersecurity standards Key Benefits: • Salary up to £65,000 depending on experience, • 4 days onsite in a central London office, • Exposure to front-to-back office technology and teams, • Strong bonus and benefits package Key Requirements: • Experience in financial services or trading environments, • Proficiency in C#, SQL Server, and front-end development (React preferred), • Experience working with APIs and market data (e.g. Bloomberg, Fidessa), • Strong communication, problem-solving, and collaboration skills Other Information: • Agile working culture in a fast-paced environment, • No visa sponsorship – candidates must have full UK working rights, • Ideal for developers looking to grow in a cross-functional financial tech team, • Direct communication with business and technical stakeholders To apply, please use the link provided or reach out directly to arrange a confidential conversation:

Founding Engineer – Shape the Future of Live Human Connection | £110k | Remote Here at Venchr, we’ve partnered with a stealth-mode startup that’s reimagining how people connect live online. This isn’t just another video app or social platform — it’s a bold attempt to bring back the magic of real-time, human connection in a digital world that’s become too passive, too polished, and too lonely. They’re building a new kind of live experience — one that feels spontaneous, intimate, and alive. Think: the energy of a party, the serendipity of a hallway chat, or the joy of a late-night hangout — all reimagined for the internet. Why this matters We believe the next wave of the internet won’t be about content — it’ll be about presence. This team is creating a space where people can show up, be themselves, and share real moments with others. It’s playful, weird, and deeply human. They’re backed by top-tier investors, have early traction, and are now looking for a Founding Engineer to help bring this vision to life. What you’ll do As the first engineering hire, you’ll work directly with the founders to: • Architect and build the core product from the ground up, • Rapidly prototype and iterate based on real user feedback, • Make foundational technical decisions that will shape the company, • Collaborate closely on product, design, and user experience, • Help define the engineering culture and future team You might be a great fit if you: • Have strong full-stack experience and thrive in zero-to-one environments, • Care deeply about how things feel, not just how they function, • Have experience with real-time tech (WebRTC, sockets, etc.) or creative tools, • Are excited to build something joyful, meaningful, and a little weird, • Want to be part of a small team doing something ambitious and new What’s in it for you • Founding equity — meaningful ownership in what you’re building, • Creative freedom — your ideas will shape the product and the company, • Remote flexibility — work from anywhere, sync with a tight-knit team, • A chance to build something people didn’t know they needed — until they try it How to apply If this speaks to you, we’d love to hear from you. Send us a note about who you are, what you’ve built, and why this mission resonates. Venchr is an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances

🌟 Principal JavaScript Engineer (TypeScript / React / Node.js) £150,000–£170,000 + Equity | Hybrid – 3 days in London We’re helping a VC-backed SaaS scaleup reinvent how organisations manage and approve spend, from software requests to supplier onboarding, and they’re gearing up for serious growth. With enterprise clients already on board and revenue climbing, they’re looking for an outstanding Principal Engineer to drive their platform forward. The company in a nutshell • Funding: $25M Series A from top-tier investors, • Leadership: Founders with a track record of building one of Europe’s best-known B2B scale-ups, • Growth: Plans to 10× revenue and expand to 200+ enterprise customers within 3 years What’s on offer • Influence the architecture and scalability of a modern, cloud-native, no-code platform, • Build features from scratch and own them through deployment and user impact, • Work with a high-trust engineering culture where product ownership is real, not buzzwords, • Ship fast — multiple times a day — thanks to a rock-solid CI/CD setup, • Collaborate closely with product, design, and leadership to shape the roadmap Tech stack you’ll be working with: TypeScript, React, Node.js, AWS Serverless (Lambda, DynamoDB, EventBridge) What you’ll be doing: This isn’t just about writing code, it’s about owning problems end-to-end and influencing every part of the product lifecycle. You’ll: • Lead the design and delivery of high-impact, full-stack features from concept to production., • Make key architectural decisions to ensure our systems remain fast, reliable, and observable as we scale to hundreds of enterprise customers., • Collaborate closely with product, design, and leadership to set roadmap priorities and define technical strategy., • Work across the stack — from React frontends to AWS serverless backends — and own your projects from infrastructure to styling., • Deploy continuously (multiple times per day) using their robust CI/CD pipelines., • Mentor other engineers and help grow a high-performance, high-trust team. What we’re looking for: • 6–10+ years in software engineering (open to exceptional candidates outside this range), • Proven full-stack ability with TypeScript, React, and Node.js, • Experience with AWS serverless technologies, • Passion for delivering excellent products at speed without sacrificing quality, • Experience scaling early-stage products or leading top-tier engineering teams You’ll thrive here if you: • Love working in high-growth, fast-moving environments, • Naturally take ownership rather than waiting for instructions, • Care deeply about clean code, great UX, and real customer outcomes, • Have a track record of excellence in any discipline Benefits • Hybrid working: 3 days a week in our new Victoria HQ (Tues–Thurs), • Visa sponsorship and relocation packages are available, • Equity with meaningful upside in a high-growth business, • Work closely with the new VP of Engineering (ex-top European scaleup), • Engineering team doubling this year — your impact will be huge Fast hiring process — 2–3 weeks • Intro chat with Hiring Manager, • Pair programming in TypeScript, • Engineering Culture & System Design, • Final culture interview This is your chance to join one of Europe’s most exciting early-stage tech teams — building category-defining software with autonomy, impact, and the kind of growth potential that doesn’t come around often. 📩 Apply now or reach out to Sam Barcia for a confidential conversation.

Senior to Principal Software Engineer | Mission-led Fintech - Hybrid London Here’s the thing. If you’re a Senior, Staff, or Principal Software Engineer who wants serious impact without the ego-fest, this will probably speak to you. I’m partnering with a fast-growing fintech that helps millions manage how they earn, save, and spend from one simple app. Backed by top VC and impact investors. Real users. Real outcomes. I’ve seen a lot of roles, and this one stands out because the mission isn’t a veneer. It runs through product, data, and engineering decisions day to day. Why this is worth your time • Work that matters. You’ll ship features that improve financial wellbeing for people who actually need it., • Scale that tests your thinking. Millions of active users, real traffic spikes, and data you can do something with., • Proper ownership. Fast cycles, low ceremony, and room to shape architecture while mentoring others. What you’ll work with as a Staff Software Engineer • Stack: Python, TypeScript, React, Svelte, PostgreSQL, Snowflake, AWS., • Setup: Cross-functional squads that care about outcomes, not ticket-ticking., • You’ll improve scalability, evolve architecture, and still ship. I like that balance. Less pontificating, more building. What you’ll do • Design and build reliable, scalable systems that hold up under load., • Lead on architecture decisions. Pick the right pattern for the problem., • Mentor engineers. Model high-quality code and thoughtful reviews., • Ship usable product. Measure impact. Iterate quickly. What you’ll bring • Senior to Staff-level experience building distributed systems at scale., • Strong technical depth across backend and either frontend or data., • Pragmatic problem solving. You know when to go simple and when to go deep., • A genuine interest in tech that helps people. I think that matters here. Package and ways of working • Strong base salary plus equity, • Hybrid, 3 days per week in the London office, • 25 days annual leave, enhanced parental benefits, private healthcare, • Sabbatical and volunteering leave, • Tax-efficient pension and flexible benefits schemes If you’ve been looking for a Principal or Senior Software Engineer role in London where you can build for scale and feel good about the outcome, let’s talk. Drop me a message here or email your CV. Even if you’re just curious, I’m happy to share the full brief and talk through fit. Senior Software Engineer London, Staff Software Engineer, Principal Engineer, Fintech jobs London, Python, TypeScript, React, Svelte, PostgreSQL, Snowflake, AWS, scalable systems, distributed systems, hybrid jobs London #hiring #softwareengineering #seniorsoftwareengineer #principalengineer #staffengineer #fintech #londonjobs #python #react #typescript #aws #postgresql #snowflake #careers

Product Engineer Want to build tools and infrastructure that will support AI-first software integrations and allow agentic workers to access systems safely and reliably? Can you do it all with a relentless focus on what your customers want, whilst leaving room for experimenting with things they have not even got to grips with yet? MCP is a good example of an area where you might experiment with the latter? That covers the space in which you will be building a product, but you also care about who you are building with. The team is fun, friendly, and from around the world. The founders have done this before and it shows. Whilst AI is a fast-moving space in which to be building the culture in the office is calm and focused. They choose to work in person twice a week and regularly eat lunch together. Series-A funding is in the bag and paying enterprise customers have lots of things they would like built and that is where you come in. Excellent engineering credentials, a product mindset and a desire to impress with the quality of your work make you an obvious choice for this role. Must-haves: • Full-stack software engineering experience with depth in backend, • TypeScript or Python on AWS. Ideally, you have worked in both, • Systems design skills - there's a very tough interview on this! Nice to have: • Experience of building B2B SaaS products, • Have shipped AI products before FAQs: • How much does it pay? Up to £100 000 base + equity + bonus, • Working arrangements? Two days in office. Tuesdays and Thursdays Does this role sound like it could be your next gig? If you are serious about the role and would like your CV reviewed by a human. Send me an email, . Put “I am the human in the loop” in the title and in the body make sure to tell me in your own words why you are interested in this role. Please make clear your right to work in the UK. All applications received this way will receive feedback.

Senior Full Stack Engineer (Backend-leaning) - High-Growth eCommerce Platform London / Hybrid (1 day per week) · c£80,000 + Share Options · VC-backed Series A Startup 🚫 This company is unable to offer visa sponsorship at this time Shape the Architecture of a High-Growth eCommerce Platform We’re working with a VC-backed, Series A startup in the luxury eCommerce space that is scaling fast and working with some of the most recognisable fashion brands globally. They’re looking for a Senior Full Stack Engineer (backend-leaning) to take ownership of architecture, data flows, and complex integrations powering a platform used by millions. This isn’t about tweaking themes, it’s about designing and scaling systems at the core of a rapidly growing business. The Opportunity • Design and scale backend systems powering payments, returns, personalisation, and more., • Lead API-first development, data modelling, and performance optimisation., • Build reliable systems in TypeScript, working across the stack with React on the frontend., • Own deep integrations with Shopify APIs and third-party services (not just theme edits)., • Collaborate closely with product and design in a lean, high-impact team., • Embrace automation and AI tooling to accelerate delivery and maintain quality. Tech Stack • Languages: TypeScript (core), Python/Ruby (data flows), • Frontend: React (preferred), Node.js welcome, • Infrastructure: AWS, • Databases: RDBMS (essential), Neo4j (nice-to-have), • Integrations: Shopify APIs, payment gateways, fraud tools You’ll Thrive Here If You... • Have strong backend engineering fundamentals (schema design, query optimisation, scalable architectures)., • Have hands-on experience scaling systems in startups or scale-ups., • Enjoy owning architecture end-to-end in small, fast-moving teams., • Are excited by working close to the product and shipping meaningful features quickly., • Bonus: experience with eCommerce APIs, Shopify, payment gateways, or growth tooling. Why This Role • Real architectural ownership in a lean engineering team., • Build systems that reach millions of users., • Fast decision-making, direct impact, and modern engineering culture., • c£80,000 + share options, hybrid London, 1 day/week in office., • Series A stage — ideal for engineers who want to shape tech foundations pre-scale. Interview Process • 30-min culture & tech fit conversation, • 60–90 min technical scenario interview (no whiteboarding), • Offer Ideal for senior full stack or backend engineers with TypeScript/React/AWS experience who want to shape architecture at a growing, product-led company.

Full Stack Developer (.NET / Angular) Hybrid – London We're hiring on behalf of a well-known retail brand looking for an experienced Full Stack Developer to join their in-house tech team. You'll work across a broad range of internal systems that support critical business functions like customer service, order processing, and fulfilment. The environment is modern, collaborative, and values clean, scalable software that solves real business problems. Tech Stack: • C# / .NET Core, • Angular (or similar SPA frameworks), • SQL Server / Entity Framework, • REST APIs / Swagger, • Git / Bitbucket What You’ll Get: • A hybrid role with a central London HQ, • Exposure to complex business systems, • A collaborative, supportive team that values clean architecture and continuous improvement, • Real ownership and impact in a fast-paced environment

Change Software Forever QA slows the world down. Flaky tests kill trust, stall releases, and bleed engineering velocity. Duku AI is ending that era. We’re building autonomous agents that think like engineers: they run every critical user journey, catch failures before users do, and self-heal as the codebase evolves. Real AI teammates, not test scripts that break on impact. We’re venture-backed and led by operators who’ve scaled Meta’s testing infrastructure, launched Uber’s global playbooks, and grew Deliveroo from zero to hypergrowth. We know what elite execution looks like and we’re hunting for one more builder to help us rewrite the rules of software quality. What You’ll Do • Ship fast, learn faster : We deploy daily, not monthly, • Talk to users, shape the roadmap : Sit in the trenches with founders on calls that define what we build, • Train AI agents: Design LLM-powered testers that explore, learn, and adapt in real time, • Own the stack :Python, TypeScript, cloud infra, from commit to production, • Turn prototypes into production : Run real experiments on models, embeddings, and retrieval pipelines What We’re Looking For • Relentless drive: You execute fast, adapt faster, • Startup scar tissue : You’ve shipped product with no safety net, • Fluency with AI/LLMs : LangChain, vector stores, prompt engineering, • Full-stack firepower : Frontend, backend, infra, no silos, • Product obsession : You care more about outcomes than outputs, • Experimental instinct: You build → test → learn → repeat Ideal Background There’s no perfect pedigree. We hire for mindset, not credentials. That said, you might have: • Shipped AI features in prod, • Built something from 0 to 1, • Thrived in chaos with high ownership Why This Matters Software is accelerating. QA hasn’t kept up. Autonomous testing is inevitable, and we’re building it. Five years from now, every high-velocity team will rely on AI agents like ours to ship faster, safer, and smarter. Join now, and help make that future real, before someone else does.

Senior Data Engineer - ClimateTech - UK based - Remote/Hybrid - £75-95k DOE + Equity Futureheads has just partnered with an early-stage climate tech venture tackling one of the world’s most urgent challenges: ocean conservation and the ocean economy. This is a greenfield build where your work will have direct global impact. In this role, you will own the full data stack from ingestion through to analytics, building and maintaining scalable pipelines across API, streaming, and batch processes. You will manage cloud infrastructure on AWS with a DevOps mindset, including CI/CD, infrastructure as code, monitoring, and scaling. Working closely with engineering and product teams, you will deliver data solutions for analytics, internal tools, and AI models, while establishing and maintaining best practices for data governance, security, and reliability. What we’re looking for: • 5+ years’ experience in data engineering and cloud infrastructure, • Expertise in Python (PySpark), SQL, and dbt (or similar), • Strong DevOps skills: Terraform, Docker, CI/CD, monitoring/logging tools, • AWS experience: S3, ECS/Fargate, RDS, Lambda, • Data warehousing experience (PostgreSQL or similar), • Experience with event streaming (Kafka, Kinesis, Pub/Sub) a plus, • Proven ability to deliver scalable, low-latency data services in fast-moving environments Whats on offer: • Real equity ownership and upside potential, • Remote-first, flexible working with occasional London office days, • Autonomy, ownership, and high-impact decision-making, • Collaborative culture with a focus on inclusion and diversity If you’re passionate about using data to make a real difference for the planet, this is your chance to join a mission-driven, early-stage team with global ambition.

Job title: Full-Stack Software Developer Job type: Contract Contract Length: 6 months IR35 Status: Inside Location: London - 2 x per week The Company: Signify are partnered with a industry leader household name with a global audience who are seeking experienced engineers to join a short-term project. Role and Responsibilities: • Develop features in Typescript and Scala (running on AWS), with flexibility to use the best tool for the problem., • Work in a cross-functional, collaborative team alongside engineers, product, and commercial colleagues., • Contribute to both technical and product decisions. Requirements: • Strong fullstack experience with Scala (functional programming) and Typescript., • Comfortable working across backend and frontend codebases., • Collaborative approach, able to work closely with different stakeholders., • Enthusiasm for building engaging digital products at scale. Accessibility Statement: We encourage applications from all backgrounds. If you require any adjustments during the application or interview process, please let us know. Our Commitment to Diversity, Equity, and Inclusion: At Signify Technology, we are committed to building a more inclusive future by ensuring every person has an equitable chance to succeed.

AI Startup in London – Hiring Frontend Engineers (Senior) – 5 days a week on-site – up to £140k I am working with a rapidly growing AI startup based in London, building next-generation products that transform how businesses use technology. They are looking for highly talented engineers who are ambitious, driven, and eager to make an impact. Roles Available: 🔹 Frontend Engineer – Strong expertise in TypeScript and React What We’re Looking For: ✔️ A degree from a top university in Computer Science, Engineering, or a related field ✔️ Demonstrated ambition and drive, reflected in career achievements and working history ✔️ Ability to thrive in a fast-paced, collaborative startup environment ✔️ Commitment to on-site work in London, 5 days a week If you are passionate about building cutting-edge products and want to work alongside ambitious colleagues in central London, please apply. AI Startup in London – Hiring Frontend Engineers (Senior) – 5 days a week on-site – up to £140k

About Medly AI We're the fastest-growing EdTech startup in London, on a mission to change education forever. We're living through a once-in-a-generation moment where AI-native companies are redefining entire industries - Cursor for code, Midjourney for image gen, Harvey for law. Medly is building a generational company for education. In just 4 months since launch, we’ve achieved retention rates that beat Duolingo and delivered personalized education to over 100,000 users. We’re looking for ambitious talent to join our team. Backed by impact-focused VCs and supported by partners including UCL, Innovate UK, Microsoft, and Google, we're becoming the go-to AI education platform for all major exams worldwide. The Role We're seeking a talented Front-End Developer who will help us craft beautiful, engaging user experiences that rival the best consumer apps, while helping us pioneer the future of AI-powered education interfaces. We know the chat message box is just version 0 of AI education - you'll be building the UI/UX that defines how millions of students interact with AI tutors. This role combines deep technical expertise with a genuine love for design as we create the next generation of educational experiences. Key Responsibilities • Build and maintain features for our React Native (Expo) mobile application, • Create smooth, delightful animations and micro-interactions that enhance the user experience, • Implement pixel-perfect designs with obsessive attention to detail, • Collaborate closely with design teams to bring concepts to life with technical excellence, • Develop and maintain features across our mobile app and Next.js web platform, • Build robust, scalable solutions that handle our rapidly growing user base, • Optimize performance and ensure smooth user experiences across all platforms, • Integrate with AI/ML services and educational content delivery systems, • Think like an interaction designer - considering user flows, edge cases, and delightful moments, • Prototype and iterate on new features with a user-first mindset, • Contribute to design discussions and provide technical input on feasibility and implementation, • Continuously improve app retention and engagement through thoughtful UX improvements Requirements • Technical Expertise: Expert-level proficiency in JavaScript and relevant frameworks such as Next.js, • Design Sensibility: Demonstrated passion for exceptional UI/UX design, animations, and micro-interactions, • Mobile Development: React Native experience would be helpful, but is not essential, • B2C Experience: Track record in building consumer-facing applications with high engagement and retention, • Full-Stack Capabilities: Comfortable working across the entire stack, from mobile frontend to backend services, • Quality Focus: Obsessive attention to detail and commitment to shipping polished, bug-free experiences, • Collaborative Spirit: Ability to work closely with designers, product managers, and other developers, • Office Presence: Able to commute 4 days a week to our office in Euston Ideal Candidate • Design-Developer Hybrid: Someone who thinks like both a developer and an interaction designer, • Game/Gamification Background: Experience in gamified applications where engagement and user delight are paramount, • Consumer App Experience: Background building apps that users love and use daily, • Educational Interest: Passion for education and learning, though specific EdTech experience isn't required, • Startup Mindset: Thrives in fast-paced environments with rapid iteration and high impact, • Innovation Drive: Excited by the opportunity to build cutting-edge educational technology, • Performance Focused: Understanding of mobile performance optimization and smooth user experiences What We Offer • Competitive salary, • Opportunity to make a real impact on educational outcomes for students worldwide, • Collaborative, diverse team united by a powerful mission, • Fast-paced environment with significant growth and development opportunities, • Regular team events and a culture focused on innovation and impact, • Work on products used by tens of thousands of students daily, • Shape the future of AI-powered education

Founding Software Engineer - AI Startup - Up to £150k 📍 London, Hybrid, 3 days in office 💰 £100–150k + generous equity 💻 Python, TypeScript, React + AI/ML toolings I'm working with a high-calibre, VC-backed startup that's building the infrastructure layer for intelligent human-AI collaboration, especially within regulated and high-complexity industries. They’ve assembled a world-class founding team and are now looking for an exceptional Founding Engineer to help build their core platform. ✅ Ideal profile: • 5+ years engineering experience (startup background preferred), • Strong backend & full-stack skills (Python, Django, TypeScript, React), • Hands on builder with high autonomy and bias to action, • Bonus: experience with LLMs, cloud infra, CI/CD, or academic/OSS projects 🧠 Why this role: • Huge ownership in a truly technical founding environment, • Exceptional team, high trust, fast execution, • Real-world impact building the operating system for next-gen work Founding Software Engineer - AI Startup - Up to £150k

About Eunice Eunice is the AI platform accelerating finance moving on the chain. We give compliance and legal professionals the intelligence layer they need to navigate digital assets with confidence. By automating complex workflows, standardising data, and aligning with global regulations, Eunice’s due diligence and monitoring platform helps institutions launch new assets, products, and partnerships - faster and with full trust. We are already working with some of the biggest names in the industry, including OKX, Zodia Custody, Copper, Zerohash, Libeara, Binance and so on. Learn more about us at ! About the role At Eunice, we are building the trusted infrastructure for digital assets and tokenized finance. We’re looking for a full-stack software engineer to join our fast-growing startup. This is an exciting opportunity for someone who enjoys a fast paced environment; loves the challenge to solve some of the hardest AI challenges; and eager to grow into a top engineering leader. What you'll be doing • Design and implement Eunice user-facing applications for all product lines., • Manage interactions between user-facing applications & the AI/data platform behind it., • Participate in company/product strategy discussion, share ideas on how the product can evolve to support future use cases., • Test and deploy your own code. About you • Entrepreneurial Spirit - You thrive in ambiguity, enjoy experimenting, and are comfortable to navigate a fast-paced, sometimes a little chaotic environment., • Growth Mindset - You always love to learn & grow, and aspire to become a top engineering leader at some point in your career., • Engineering Expertise - You have at least 5 years of experience in the industry and a solid foundation in computer science concepts:, • You enjoy solving complex coding and system design problems., • You have deep knowledge in at least one popular coding language for building web-based applications on both FE and BE, ideally Typescript, Javascript / NodeJS, etc., • You have experience with common software and system design patterns and infrastructure including APIs, cloud infrastructure tools, storage solutions, data structures etc., • Ideally you have experience working on AI/Crypto projects, or you are very eager to learn if you don’t have such experience., • You have experience working with AI / Crypto products - It’s a bonus and it is completely fine if you feel excited about the new domains and technologies, and confident to learn quick!, • You are open, or even excited to learn and work on other areas of the tech stack - Engineers with versatile skills & curiosity to learn will likely get to make a bigger impact, and achieve greater success in the long term. Why join Eunice now? • Small but mighty: we keep the team lean so every person has real impact., • Passionate, driven teammates: you’ll work alongside people who love to build and push each other to be better., • Real ownership: you’ll get autonomy, responsibility, steep learning curve and the chance to shape big decisions from day one., • Global adventure: we’re expanding fast and tackling opportunities that span markets and borders., • At the frontier: Digital assets and finance are changing fast — you’ll help shape how the industry evolves., • High-performance culture: we treat each other fairly, expect excellence, and operate like a sports team - competitive, supportive, and always raising the bar. We value speed, clarity, and ambition. You can expect the full process to take 2–3 weeks maximum from application to decision. If you’re ready to make an impact and take your career to the next level, we’d love to hear from you!

Full-Stack Engineer - Python, Typescript I’m hiring on behalf of a cutting-edge AI company building a general-purpose learning engine designed to automate complex business processes using customer data. The company is rapidly expanding its engineering teams across London and New York, with a focus on backend, infrastructure, and full-stack engineering talent. This team is deeply technical, fast-moving, and passionate about building something genuinely new. They value strong fundamentals, hands-on product experience, and engineers who can communicate ideas clearly. A track record of building technically challenging products - or learning fast through startup or founder experience- is highly valued. What You’ll Do • Deliver a fast, scalable, user-facing platform., • Collaborate closely with the London engineering team on new features and infrastructure., • Contribute across the entire stack, from APIs to front-end applications., • Iterate quickly and shape products built with novel technology. What They’re Looking For • 3+ years of full-stack engineering experience (open to strong junior candidates)., • Expertise in Python and SQL., • Experience solving complex technical problems in fast-paced, product-oriented environments., • Strong communication skills and a collaborative mindset., • Bonus: side projects or personal learning that show curiosity and passion., • Background in engineering-driven companies (startups, or technically ambitious environments) is ideal. Tech Stack Python - SQL - C - Rust - TypeScript This is an opportunity to join a high-calibre engineering team solving ambitious technical challenges in the AI space. If you’re ready to make a real impact and grow with a world-class team, I’d love to have a conversation.

Role: Junior Systems Specialist Location: Hybrid (London) Salary: Competitive + Bonus + Exceptional Benefits Our client is a leading quantitative and systematic investment firm managing billions in assets globally, with offices in New York, London, Singapore, and beyond. As they continue to scale their infrastructure, they are seeking a Junior Systems Specialist to support the backbone of their compute and storage platforms. This is a hands-on, growth-focused opportunity within a highly technical environment, perfect for someone early in their infrastructure career looking to develop in a world-class engineering team. As a Junior Systems Specialist, you’ll: • Help manage and scale distributed compute and petabyte-scale storage systems, • Install, manage, and monitor Linux (RHEL-based) environments, • Troubleshoot hardware and software issues across the full stack, • Build tools and automation scripts using Python, or Bash, • Work closely with engineering teams and vendors to resolve infrastructure issues The ideal candidate will have: • Up to 4 years of experience in a Linux systems/infrastructure engineering role, • Strong scripting skills in Python, Bash, or Ruby, • Familiarity with configuration management tools (Ansible, Puppet, or Chef), • Interest or exposure to observability tools like Datadog, Prometheus, or Grafana, • A passion for learning and improving in high-performance environments This is a rare chance to learn from elite engineers and contribute directly to a platform supporting global trading systems at scale. If you’re a technically curious systems engineer ready to grow in a fast-paced financial tech environment, apply now!

Senior Full Stack Engineer Location: London (Onsite – 5 days per week) Salary & Benefits: £80,000–£120,000 + Equity + Benefits A high-growth AI technology company is seeking a Senior Full Stack Engineer to join their world-class engineering team. This is a rare opportunity to work at the intersection of artificial intelligence, user experience, and infrastructure, helping to build a next-generation video intelligence platform used across industries, including logistics, education, healthcare, and hospitality. You’ll be joining a venture-backed, product-led startup with a strong technical foundation and a clear mission to transform how businesses leverage video data. The team includes engineers and researchers from leading global tech companies and academic institutions, and the company is already generating revenue with multiple years of runway. The Role • Design and implement scalable backend APIs and services using modern technologies., • Build intuitive, high-performance front-end interfaces in collaboration with product and design teams., • Ensure system reliability, scalability, and observability across the full stack., • Work closely with edge-computing and infrastructure teams to deliver robust, real-time features., • Take ownership of feature delivery, from development and testing to debugging and optimisation., • Contribute to architectural decisions and help shape the technical direction of the platform. Skills & Experience • 3+ years of professional experience building full-stack applications at scale., • Strong backend development skills in Python or Go, with experience designing APIs and working with databases such as PostgreSQL and Redis., • Proven experience with React and TypeScript, including component libraries and data-fetching tools like react-query., • Familiarity with infrastructure-as-code tools and cloud platforms (preferably AWS)., • Experience with CI/CD pipelines and modern DevOps practices., • Strong communication skills and a collaborative mindset., • High intrinsic motivation and a proactive approach to problem-solving. If these sound interesting, please apply or drop me an email at

Technical Lead Engineer / Director Key Technologies: C#, .NET, .NET Core, Azure, SQL Location: London Perm Role | Hybrid Working Structure Harrington Starr has partnered with a global Investment Bank, seeking to hire a Director level Engineer with extensive .NET development experience within investment banking. This person must be confident translating complex business needs into functional solutions and be able to communicate with a variety of internal and external stakeholders. Key Responsibilities • Lead delivery of software solutions across trading technology systems, ensuring alignment with strategic business goals., • Build and maintain the regional technology roadmap, consolidating systems into a consistent, scalable stack., • Manage a team of developers, fostering high performance, mentoring, and technical guidance., • Oversee vendor relationships, regulatory reporting, and compliance requirements., • Drive agile software development, system integration, and adoption of modern technologies, including cloud solutions. Benefits of the Role • Flexible hybrid working arrangements and paid leave., • Health and wellbeing support, including medical and mental health services., • Access to learning and development opportunities and career progression programs., • Inclusive and diverse work environment promoting collaboration and engagement., • Competitive remuneration package and employee benefits. Key Skills and Experience • Advanced full-stack development skills (.NET, .NET Core, C#, Python, SQL) and cloud technology experience., • Strong leadership experience managing high-performing development teams., • Knowledge of banking products, financial analysis, and regulatory requirements., • Experience delivering Agile projects, CI/CD, and DevSecOps solutions., • Excellent problem-solving, analytical, and communication skills with global stakeholder engagement. Full, unrestricted right to work in the UK is a must. No sponsorship will be provided. Please apply via the link provided or reach out to me directly to book in a confidential phone call -

Full Stack Engineer - Leading Hedge Fund (London) Our client, a world-renowned hedge fund, is seeking a talented Full Stack Engineer to join their London office. This is a rare opportunity to contribute to one of the fund's core business areas, driving high-impact, cross-functional initiatives. You'll take ownership of critical projects and play a key role in shaping the next generation of pre-trade analytics and risk management tools for portfolio managers. In this role, you'll collaborate closely with investment, research, and engineering teams to build cutting-edge, web-based trading and research platforms. Your work will directly support discretionary trading desks by delivering robust analytical tools for pre-trade decision-making and risk evaluation. Key Responsibilities: • Deeply understand the investment process and help define the future UI strategy within that context., • Partner with technology teams to evolve the investment toolkit platform using modern infrastructure and analytical frameworks., • Communicate effectively across interdisciplinary teams including research, engineering, investing, and design., • Strong programming skills in TypeScript/React and at least one backend language, ideally Python., • Proven ability to deliver high-quality UX/UI experiences., • Passion for engaging with all aspects of fixed income and macro trading., • Proficiency in Linux environments and cloud technologies., • Excellent communication skills, both written and verbal.

🚀Founding Software Engineer - AI Start-Up (Central London | On-Site | Equity + Salary)🧑‍🚀 One of London’s most promising AI start-ups are looking for their first few Founding Engineers! Backed by top-tier investors and led by an elite founding team from Oxford, Cambridge, and Imperial, this venture is already attracting serious attention within the AI space!! Currently in stealth mode, they’re now searching for a Founding Software Engineer to join the core team - someone ambitious, technically exceptional, and ready to help build the company from the ground up! 💡About the Company Founded by alumni of successful AI start-ups, this is a business led by people who’ve done it before - and done it well. With strong funding and a clear product vision, they're building cutting-edge technology that leverages the latest advances in AI to solve high-impact problems. 🛠️ Tech Stack: • Python - core backend and ML integration, • TypeScript / Node.js / React - full-stack development 🎯 What They’re Looking For: • 4+ years of experience in high-growth environments, • Strong engineering fundamentals and a deep product mindset, • A top-tier academic background – 2.1/First from top university, • Experience building and scaling real-world applications from scratch, • Passion for AI and enthusiasm for working in a fast-moving, collaborative setting, • A team player who thrives in a full-time, in-office environment (Central London - 5 days/week) 💸 What’s on Offer: • Highly competitive salary - 6 figures+, • Significant equity stake – this is a founding-level opportunity, • Fantastic benefits 🏝️🧑‍⚕️🚗, • Close collaboration with some of the brightest minds in AI and software, • A chance to help shape company culture, technology, and trajectory, • The energy, speed, and ownership of an early-stage start-up - with real backing If you’re an ambitious engineer ready for your next big challenge, and want to be part of something truly special, this could be the opportunity that defines your career! Interested? Let’s talk!

Who We Are Cint is a pioneer in research technology (ResTech). Our customers use the Cint platform to post questions and get answers from real people to build business strategies, confidently publish research, accurately measure the impact of digital advertising, and more. The Cint platform is built on a programmatic marketplace, which is the world’s largest, with nearly 300 million respondents in over 150 countries who consent to sharing their opinions, motivations, and behaviours. We are feeding the world’s curiosity! Job Description The Opportunity Cint seeks a Cloud Infrastructure (DevOps) Engineer to join our Infrastructure team, reporting to the Infrastructure Engineering Manager. As a Cloud Infrastructure (DevOps) Engineer at Cint, you will be an efficient problem solver, learn on the fly and make decisions quickly. You will have the opportunity to work with the latest technologies, we always strive to be at the forefront of the latest tech stacks and tools used within our domain. Your focus in the role would be: • Work as part of the Infrastructure team on sprints that evolve our core platform and systems, • Provide point of expertise on infrastructure and CI/CD to our wider engineering teams - often working as part of their scrum on larger projects, • Automate the build and deployment of software to our cloud platform and help the organisation do it more efficiently and effectively. Eliminate all repetitive manual operations from our daily lives, • Improve our monitoring and alerting systems to enable engineering teams to successfully operate and gain insights into the behaviour of applications in “hands-off” environments, • Participate in an on-call rotation and assist with troubleshooting issues that arise The Team The Infrastructure Team’s mission is to design, build and develop secure and highly available infrastructure, but also to provide a self-service environment that enables software development teams to move fast, stay compliant and take end-to-end responsibility for their products. Major elements of our platform include AWS (we make significant use of S3, RDS, Kinesis, EC2, EMR, ElastiCache, ElasticSearch and EKS). Elements of the platform will start to expand into GCP (Compute Engine, Cloud Storage, Google Kubernetes Engine and BigQuery). Other significant tools of the platform include Linux, Terraform, Kubernetes, Docker, Packer, Ansible and Jenkins. We support applications and services written in Golang, Python, Java, Scala and .Net. We monitor and alert on everything we deploy via Grafana, Prometheus, Graphite and ELK stacks. The team holds itself accountable to a high standard of build quality. We have recently completed the first major phase of a completely green-field infrastructure and platform rebuild that is designed to underpin Cint’s business applications for the next decade. We are compulsive about infrastructure as code (nothing in our platform is created or deployed unless via a code change) and driven to achieve a full end to end continuous deployment pipeline. What We Are Looking For • You will be someone that shares our values and ambitions and can bring something to the team that we can benefit from. It might be prior experience of the journey, architectural insight into cloud native systems, specific technology expertise in parts of our stack or a combination of them all. Whatever it is, you will be the kind of person that is energised by complex challenges, teamwork and problem solving. Qualifications Required qualifications: • You have experience in predominantly cloud infrastructure roles (AWS) working within teams that practice DevOps, • You can interact confidently with cloud platforms including AWS & GCP via CLI and/or API, • You have expertise and solid experience in deploying infrastructure as code with, at minimum, Terraform and ideally some of the supporting cast (Ansible, Packer), • You have excellent knowledge of building and running Docker images/containers, • You have excellent knowledge and understanding of the software development lifecycle, including the use of git and continuous integration tools (Jenkins’ Groovy DSL, TravisCI, GitHub Actions etc.), • You have a grasp of “cloud native” and 12-Factor applications, • You have good knowledge of monitoring and alerting using one or more of: Graphite, Statsd, Prometheus, Grafana, PagerDuty, • You have good knowledge of the network stack at L4 and L7, particularly inter VPC routing, • You have some experience with managing DNS and resolver hierarchies, • You can debug HTTP APIs and understand other L7 protocols, • You have experience at administering Kubernetes, • You have specific cloud security expertise (threat assessment, attack surface management, SGs, NACLs, data security), • You have experience of building and running Windows servers in AWS, • You have experience of continuous deployment strategies and technologies (Blue/Green, DNS or LB weighting, automated regression testing, Spinnaker, CodeDeploy, Jenkins for CD) Additional Information Our Values Collaboration is our superpower • We uncover rich perspectives across the world, • Success happens together, • We’re pioneers in our industry, • Our curiosity is insatiable, • We’re accountable for our work and actions, • Excellence comes as standard, • We learn from each other’s experiences, • Stop and listen; every opinion matters, • We embrace diversity, equity and inclusion. More About Cint We’re proud to be recognised in Newsweek’s 2025 Global Top 100 Most Loved Workplaces®, reflecting our commitment to a culture of trust, respect, and employee growth. In June 2021, Cint acquired Berlin-based GapFish – the world’s largest ISO certified online panel community in the DACH region – and in January 2022, completed the acquisition of US-based Lucid – a programmatic research technology platform that provides access to first-party survey data in over 110 countries. Cint Group AB (publ), listed on Nasdaq Stockholm, this growth has made Cint a strong global platform with teams across its many global offices, including Stockholm, London, New York, New Orleans, Singapore, Tokyo and Sydney. () Additionally, in a world of AI, we want our candidates to understand our approach to the use of AI during the interview and hiring process, so we'd appreciate you reading our ___.

Full-Stack Engineer — Axola Axola is an AI-powered digital coaching platform. We’ve built a proprietary computer vision system that analyses biomechanics from video to deliver real-time feedback, personalised training plans and performance insights. Over the past two years we have developed and validated the core technology, secured strategic partnerships with sports and technology companies, and are now expanding our UK-based team to take the product to market and scale internationally. We are looking for a Full-Stack Engineer to strengthen our product development and support the launch of the Axola app. You will take ownership of the technical delivery across frontend, backend, cloud and mobile, working closely with the founder and AI/ML engineers. Your responsibilities will include developing the web platform and mobile app, building APIs, supporting integrations, and deploying machine learning models into production. Requirements: • Strong full-stack development skills (React/Next.js, Node.js, Python, TypeScript)., • Experience with mobile app development (React Native or Flutter) or integration with iOS/Android apps., • Backend expertise (databases, APIs, authentication, security)., • Cloud experience (AWS/GCP/Azure, Docker, Kubernetes, CI/CD pipelines)., • Ability to integrate and deploy ML models into production., • Startup mindset — ability to deliver with limited resources and wear multiple hats., • Passion for sport and technology is a strong plus. What we offer: • Competitive salary (depending on experience)., • Equity options are available for the right candidate., • Opportunity to shape and scale a product with proven technology and active partnerships., • Be part of a UK-based Sports AI startup building the future of digital coaching. 📍 Location: London, Soho, UK ⚖️ Eligibility: Candidates must hold a UK passport or Indefinite Leave to Remain (ILR).

[Up to c. £200k Comp Package | Hybrid Working - 4 Days in Office] Role Overview We’re supporting a world-leading quantitative trading firm in the search for an Experienced Software Developer/Engineer to join their OTC technology group in London. This team designs and develops high-performance trading platforms that span both OTC liquidity provision and on-venue execution, covering asset classes such as equities, FX, and crypto. Operating within a highly autonomous environment, the team works closely with quants, risk and compliance stakeholders, and trading analysts to transform requirements into production-grade systems. With a focus on safety, performance, and velocity, this is a chance to contribute to the design of mission-critical infrastructure with a small, experienced group of engineers where impact is immediate and highly visible... Key Responsibilities • Design, build, and maintain OTC trading systems spanning pricing, risk controls, venue connectivity, and algorithmic execution, • Translate business, model, and control requirements into performant, scalable code with an emphasis on correctness and reliability, • Work closely with quants, analysts, and compliance stakeholders to refine system requirements and deliver production-ready solutions, • Implement and optimise low-latency infrastructure, including network stack integration, thread-per-core architectures, and performance tuning, • Contribute to team-wide design discussions, code reviews, and continuous improvement initiatives, • Take ownership of projects across the full development lifecycle, from architecture through deployment and monitoring What You’ll Bring... • 4+ years hands-on experience building distributed or performance-sensitive systems, ideally with microsecond-level latency or high-throughput requirements, • Proven coding ability in Kotlin, or another object-oriented language such as Java (preferred), C++ or C#, • Familiarity with Linux APIs and comfort developing in a Linux-based environment, • Strong computer science fundamentals with several years’ experience in professional software development, • Experience applying modern testing approaches to ensure robustness and safety of critical systems, • Collaborative and pragmatic approach to code reviews, focusing on correctness and clarity, • Curiosity about financial markets; prior trading experience is preferred ...

Our multi-strategy hedge fund client is seeking an experienced Full Stack Developer to join their technology team in London on a contract basis. You'll be working on critical middle and back-office systems that support trading and operations functions. Key Responsibilities • Design, develop, and maintain full stack applications using C# backend and React frontend, • Build and enhance middle and back-office systems supporting fund operations, • Collaborate with business stakeholders including fund accounting, operations, and trading teams, • Develop scalable, high-performance solutions for financial data processing, • Participate in code reviews and maintain high development standards Required Skills & Experience • Strong proficiency in C# .NET (Core preferred) for backend development, • Solid experience with React and modern JavaScript frameworks, • Experience with SQL Server and database design, • Proven experience working on middle/back-office systems in financial services, • Understanding of fund operations workflows and processes, • Experience with RESTful APIs and microservices architecture, • Strong problem-solving abilities and attention to detail Highly Desirable • Experience with fund accounting/administration systems (Geneva, Charles River, SimCorp, etc.), • Knowledge of portfolio accounting concepts and post-trade lifecycle, • Familiarity with financial instruments (equities, fixed income, derivatives), • Understanding of hedge fund operations This is a leading multi-strategy hedge fund managing billions in assets across global markets. Offering a collaborative environment with cutting-edge technology and exposure to complex financial systems. Please submit your CV for immediate consideration.

Java Engineer – Greenfield Trading Systems | World-Renowned Bank Join a globally recognized financial institution celebrated for its commitment to innovation and cutting-edge technology. Our client is embarking on an exciting greenfield project to build next-generation trading engines and investment strategy platforms that will shape the future of their trading operations. They are looking for a highly experienced Java Engineer who brings deep trading systems expertise and thrives on designing modern, scalable architectures. Key Responsibilities: • Collaborate with cross-functional teams to build high-performance trading systems from the ground up., • Design and implement robust, scalable Java-based services within a containerized environment., • Contribute to architectural decisions, ensuring best practices in reliability, latency, and performance., • Bring technical leadership to a highly skilled engineering team in a fast-paced trading environment. Key Skills & Experience: • 5+ years of hands-on experience with Java in high-performance environments, • Strong understanding of trading systems and investment workflows, • Experience with Kubernetes and container orchestration, • Familiarity with modern system design, microservices, and CI/CD best practices What’s in it for you? • Competitive Salary – commensurate with experience, • 10% Pension Contribution, • Private Healthcare – full coverage for you and your family, • Flexible Working Hours – work-life balance is a priority, • Opportunity to work on greenfield, mission-critical systems with the latest tech stack, • Be part of a forward-thinking, globally respected financial institution

Are you an AI engineer with strong software engineering fundamentals? Have you deployed AI models into production—not just trained them? Want to work on agentic systems, RAG pipelines, and LLM-powered tools? We're working with a high-growth GenAI consultancy building real-world, production-grade AI applications. With a team of 50+, the company partners with global clients across finance, energy, media, and tech. From hedge funds to energy and health-tech, their projects are diverse and technically challenging. With strong client demand and deep partnerships (including OpenAI), the team is scaling fast across the UK, Singapore, and Australia. As a Senior Applied AI Engineer, you’ll take ownership of designing and deploying AI-powered applications that solve real client problems. You’ll work across full-stack delivery, from architecture to production deployment, collaborating with cross-functional teams and mentoring other engineers. Key Responsibilities • Build and deploy scalable AI tools using Python and LLM APIs, • Design end-to-end agentic and RAG-based solutions for enterprise use, • Own delivery from proof-of-concept through to production, • Work with cloud-native architectures (e.g. AWS Lambda, Step Functions), • Lead and guide junior engineers within project teams Key Details • Salary: £100,000–£130,000 + benefits, • Working model: Hybrid (3 days/week in London office), • Tech stack: Python, LLMs (OpenAI/Claude), Docker, CI/CD, microservices, AWS If you're a strong backend or platform engineer passionate about GenAI and excited to ship high-impact tools, this is the opportunity to step into it. Budget • Salary range: £100k–£130k base, • Benefits: Standard package, • Sponsorship: Yes, • Hybrid: 3 days/week (London HQ) Note: this role cannot sponsor Interested? Please apply below.

Founding Engineer – Early-Stage Deep Tech Startup Full-time | Onsite in London £180,000 + Substantial Equity An early-stage, stealth-mode startup is looking for a Founding Engineer to join the team in central London. This is a unique opportunity to help build a transformative new platform at the intersection of software systems, automation, and intelligent infrastructure. Founded by leading academics and proven entrepreneurs, the business is backed by top-tier investors and is solving complex technical problems that demand creativity, rigour, and ambition. The Role • Build and own core systems and architecture from the ground up, • Work closely with the founding team on product direction and technical strategy, • Make key decisions across the full stack — from infrastructure to user-facing elements, • Contribute to the early engineering culture, processes, and hiring Ideal Background • Experience building complex systems in a startup or high-growth tech environment, • Strong computer science fundamentals; comfortable working across multiple layers of the stack, • Demonstrated ability to operate in fast-moving, ambiguous environments, • Bonus: familiarity with compilers, distributed systems, systems design, or programming languages theory Offer • £180,000 base salary, • Significant equity in a high-potential startup, • London-based, full-time — onsite collaboration with a world-class founding team

Full-time | Salary + Equity | Purpose-led startup Joyned is on a mission to help organisations build strong, safe communities through better communication. We’re looking for a hands-on software engineer to take ownership of our codebase and help shape how the product evolves. We’re a funded startup, built in partnership with Brightec (the team behind apps for Waterstones and Virgin Trains). We launched last year. Since then, Joyned has already helped churches, charities, events and commercial organisations (including Hillsong, Big Church Festival, Newday and Lifetime Brands) transform how they connect with their communities. This is a solo engineering role, as we kick-off our in-house engineering team. You'll be our only full-time engineer, writing, testing and shipping code across the whole stack. You won’t be micromanaged - you’ll lead and pioneer. Our founder will be involved in technical decisions and we can draw on external support if required, but the day-to-day is yours to lead. We're not hiring for a job title. We care more about your mindset, your ability to get things done, and your fit with our team. If you’re confident, self-sufficient, and not afraid to figure things out, this might be the role for you. We’re a small team. You won’t just write code, you’ll help shape how Joyned grows, and how we work together. It is primarily a remote role, but with the option to work once per week from the Brightec studio in Shoreham-by-Sea. We also gather the team together at least a couple of times per year, for extended planning and relationship building. If you’ve been part of a church community, all the better – many of our users have too. That context matters to us. Tech stack: Python, TypeScript, MySQL, GraphQL, React Native (including React Native for Web), Django, Celery, Docker, Kubernetes. You don’t need to know everything on day one, but you’ll be working across all of it, so a full-stack mindset is key. Salary Range: £50k to £65k depending on experience. As an early-stage startup, we know we can't always match big company salaries, but we're open to offering equity for the right person who wants to share in what we're building. Hiring Process Please apply for this job via LinkedIn to receive additional details on the application process. Please include a covering letter along with your CV. No Agencies or Recruiters

Create the future of travel with us ✈️ Whether it’s to visit the people closest to us, starting an exciting adventure, or a career-defining business trip, travel is an essential part of our lives. Yet we've all experienced the aches and pains of getting to our destination. Today, more than 4 billion airline passengers rely on technology that hasn't kept up with the expectations of the modern connected traveller. That’s why we’ve started to rebuild the infrastructure that underpins the travel industry. We’re on a mission to unravel travel — simplifying systems and building the tools that will make the future of travel effortless. We were part of Y Combinator S18's cohort and we are backed by Benchmark, Blossom, Index Ventures and Kima Ventures. A fantastic set of investors that has helped build some of the world's largest companies. Our team in London is growing and we’re looking for talented people to join us on our journey 🚀 🤖 Engineering at Duffel We're building tools to simplify travel distribution, search and booking. What does this actually mean? It's one common and seamless API. This brings huge technical challenges as we need to design and build a beautiful API before integrating to hundreds of airlines. Along with that we need to navigate through the differing needs and systems of each airline whilst building a fantastic developer experience to go with it. The tools used on the team include Elixir, Phoenix, Kubernetes and Google Cloud Platform. ⚙️ Site Reliability Engineering at Duffel As an SRE at Duffel, you’ll be part of a small team within engineering that is responsible for the reliability, performance, and resilience of our infrastructure and applications. You will be working closely with engineering teams to understand their needs and help meet the demands of our product as we scale globally. What we're looking for 👀 • An infrastructure and systems engineering generalist who is comfortable diving deep into the weeds on different issues. Some recent examples include:, • A configuration issue between Google’s Load Balancer and the HTTP server in our main Elixir application causing HTTP 5XX responses to be returned to our customers., • Debugging an issue in our OpenTelemetry pipelines causing us to silently drop spans., • An enthusiasm for both software development and systems engineering., • A high bar for code and configuration quality and readability., • A good understanding of current observability and reliability practices., • Experienced and comfortable in running incident response., • Big picture thinking - you can make trade offs on technical work streams against business impact., • Fantastic communication skills. You're able to articulate what you're working on and why to the team in a clear and structured way., • You thrive in a collaborative environment. You believe in your own methods but keep an open mind, taking suggestions and feedback onboard as well. Technologies 💻 • We run our infrastructure on Google Cloud Platform, so you’ll be helping to run a few of their products such as GKE, CloudSQL for PostgreSQL, BigQuery, Memorystore (Redis) and more., • We manage the infrastructure and security for a segregated PCI Cardholder Data Environment, entirely managed with Google Cloud Platform services and tooling., • We follow an Infrastructure as Code approach to managing our infrastructure, using Terraform., • We follow a GitOps approach to managing our Kubernetes configuration, using ArgoCD and Helm., • We manage a high-availability metrics collection system using Grafana, Thanos & Prometheus. We’re in the process of transitioning to OpenTelemetry and Honeycomb for our application telemetry (traces and metrics)., • We manage a data pipeline using Pub/Sub, Airbyte, and dbt. Don’t worry if your experience doesn’t exactly align with this stack, we understand that skills are transferrable. This is to give you an idea of what you’ll be working with if you join the team. Our Current Focus 🎧 We’re currently driving a big shift in how we think about and monitor reliability across the engineering organisation, with a focus on early detection of customer-impacting issues. We’re extending and standardising our use of OpenTelemetry, and introducing Honeycomb as the single place for engineers to understand how our applications are operating in production. This project involves both technical work, on the application libraries and infrastructure that make up the OpenTelemetry pipeline, and an education piece, working to change perceptions and behaviours across engineering. The Future 🚀 • We currently run all our services from a single European region in Google Cloud. In the medium term, for performance, reliability, and data residency reasons, we’ll be starting to think about how to (re)architect our applications and infrastructure to span multiple regions, operating globally., • We deploy our application multiple times a day, but deploys are all or nothing, and when we encounter issues, roll backs are slow. One way to address this would be to invest in CI/CD performance improvements, but we’d also like to explore alternative deployment strategies like Canaries, Blue/Green, and traffic mirroring, and get more comfortable testing changes in production with real customer traffic. 🤗 What you can expect from us: We're dedicated to your personal growth. Our environment is comfortable both physically, but also in that our ears are always open to any ideas, concerns and questions. We believe that everyone should have pride in their work, taking full ownership of it and its impact. That's why everyone who joins Duffel owns a share of the company. We are an equal opportunities employer. We believe that the key to our success is employing a diverse team, that's why recruitment decisions are only based on your experience and skills. We value your ability to problem solve and build amazing things so we welcome applications for everyone – regardless of age, sex, disability, sexual orientation, race, religion or belief. Note to recruitment agencies Duffel does not accept speculative CV's from external parties. Any unsolicited CV's sent to us will be treated as property of Duffel, and any attached terms and conditions associated with these CV's will be null and void ❌

Experienced Back End Typescript / Javascript Developer (AWS, Typescript, NodeJS, GraphQL) - TSDBE25 You will need extensive experience using Typescript and AWS services for this role. We develop the SaaS platform that keeps beer flowing through the UK’s pubs. We run a serverless stack, using the Serverless Framework, AWS Lambda, AWS AppSync and other AWS managed services. We use TypeScript, but our priority is designing maintainable, modular, and well-tested code. You will be able to demonstrate extensive experience working with these technologies and be very comfortable developing and deploying complex event-driven applications using this stack. Because we are a smaller team your contribution will really be valued. You will be able to influence the way we work and how we build our products. Equally we will be relying on you to work hard, muck-in when needed and create amazing software. We’re supportive, fun and enthusiastic. We care about your development and will spend a significant amount of time supporting your ongoing learning and development goals. Key Duties and Responsibilities • Recommending appropriate AWS architectures for new product features, • Developing new product features on the backend (Typescript, NodeJS, AWS Services), • Evolving existing features to provide enhanced functionality, • Following test driven development (TDD) approach to development, • Maintaining existing software, • Maintaining security and resilience of our systems, • Responding to and resolving system degradations, • Contributing to code reviews and helping shape good practices across the team, • Developing an in-depth understanding of our underlying codebase, data structure and system architecture, • Developing a close relationship with our stakeholders to provide operational support, • Working closely as a proactive member of our team Working Hours Our usual working hours are Monday to Friday 9am to 5pm. In addition, we ask you to be available to respond to production system degradations at any reasonable time. Candidate Profile Essential Technical • Confident Typescript & NodeJS programmer, • Extensive experience using: • Typescript, • NodeJS, • AWS Lambda, • AWS Amplify, • AWS AppSync, • AWS Cognito, • AWS Dynamo, • AWS CloudFormation, • Other AWS serverless services • Extensive experience of writing clean, readable and well-structured code that aligns with engineering best practices (e.g. SOLID principles and test driven development)., • Experience working with Git, Github and the Gitflow branching model, • Strong understanding of security best practices Experience of the following is also highly advantageous: • AWS Athena, • AWS Glue Personal Attributes • Inquisitive, innovative, lateral thinking, • Thorough with strong attention to detail, • A proactive and determined approach to problem solving, • A passion and aptitude for working with business data, • Capable of prioritising multiple streams of work, in varying states of completion, • Great communication skills, both written and verbal, • Comfortable working in a fast-paced environment, • Have a passion for the web, digital and emerging technologies, • Be a natural advocate for data and BI, • A natural collaborator and team player Company Benefits • Competitive salary and bonuses, • Central London office (min. 3 days per week), • Hybrid working, • Matched charity donations, • Charity volunteering days (full pay), • Work from the EU scheme, • Generous holiday entitlement with option to purchase extra days off, • Private medical insurance contributions, • Summer working hours, • Annual coffee card, • Cinema vouchers, • Pension contributions, • Remote working equipment subsidy

Founding Software Engineer 📍 Hybrid — London/Athens 🕒 Full-time | Mid/Senior Level 🚀 Founding Team About Us Inferity is transforming how teams search, analyze, and understand frontline video. From hours of unstructured body cam or incident footage to complex multi-source workflows, our AI-driven platform turns video into structured, decision-ready insights. We’re building AI agents that reason across video, audio, language, and metadata, powering real-world workflows where accuracy, speed, context, and clarity are essential. The Role We’re looking for a Founding Software Engineer to lead backend and infrastructure development for our category-defining video understanding product. From data ingestion pipelines to scalable APIs, you’ll blend backend engineering and DevOps to turn cutting-edge AI into a production-ready platform. As part of the founding team, you’ll design and implement system architecture, backend services, and cloud infrastructure, working closely with AI scientists and full stack engineers to deliver a scalable, reliable product. Why Join Us 🎯 Work on impactful AI that improves safety, trust, service quality and decision-making 🚀 Founding team equity 🛠 Deep technical challenges, exposure to the latest AI developments 💬 End-to-end ownership + product influence 🌍 Flexible location (London/Athens hubs) Key Responsibilities • Architect and implement the backend platform for data processing, search, and advanced reasoning, • Design scalable systems and APIs for data-intensive, low-latency workflows, • Optimize database interactions for high-speed visual search and reasoning, • Manage cloud infrastructure (compute, networking, storage, security, observability), • Set up CI/CD pipelines for fast, reliable deployments, • Deploy and integrate AI/ML models into production pipelines, • Take a product-first approach: asking “why,” not just “how” What You’ll Need Essential Skills • Startup Mindset: Bias for action, ownership, comfort with ambiguity, • Backend Development: Python (FastAPI, Flask) + microservices, • Distributed Systems: Scaling high-volume data systems, • Cloud: AWS/GCP/Azure (ECS/EKS, S3, Lambda, IAM or similar), • Databases: PostgreSQL + strong data modeling, • Containers: Docker; orchestration tools, • Infra as Code: Terraform, CloudFormation, • Monitoring: Prometheus, Grafana, ELK, • Security & Compliance: Data protection and access control Nice-to-Haves • AI/ML integration (PyTorch, HF etc.), • MLOps (MLflow, Kubeflow, SageMaker), • Vector search (Pinecone, pgvector, Weaviate, Qdrant etc.), • Video ingestion pipelines & codecs 💡Don’t worry if you haven’t used these exact tools. If you’ve built and scaled similar systems, we’d love to hear from you. Next Steps Apply here or email us at with your CV, GitHub, or just a note on why this role excites you. 🚀

Location: London Job Type: Full-Time About Us: At iPsychTec, our mission is simple: combine the best elements of scientific and applied research to develop and deploy behavioural diagnostics and predictive people analytics tools to help our clients drive their desired workplace culture and achieve sustainable competitive advantage. iPsychTec is an ambitious, world-leading behavioural science organisation with a fast-paced growth strategy and a bright future. You will be joining the firm at a key stage of its evolution, and your role will be pivotal to the business. This is a great opportunity to be part of our team to drive our software development agenda for our people analytics cloud products. Job Description: We are seeking a highly skilled Full Stack Java Developer to join our dynamic team. In this role, you will be responsible for designing, developing, and maintaining scalable web applications leveraging Java technologies within an AWS cloud environment. You will collaborate with cross-functional teams to deliver high-quality software solutions that meet business requirements. Key Responsibilities: Develop, test, and maintain scalable backend SAS using Java with AWS. Build intuitive, responsive front-end applications using modern JavaScript frameworks (React, Angular, or Vue.js) Architect and deploy cloud-native applications utilising AWS services such as EC2, S3, Lambda, RDS and API Gateway Optimise application performance and ensure high availability and security in the cloud Collaborate with product teams to deliver features on time and to specification Write clean, maintainable code with proper documentation Troubleshoot, debug, and resolve technical issues Qualifications: Bachelor’s degree in Computer Science, Engineering, or related field At least 3 years’ experience in full-stack development with Java, and JavaScript frameworks Strong understanding of AWS cloud platform and services Knowledge of RESTful APIs, microservices architecture, and database management (SQL and NoSQL) Experience with CI/CD tools such as Jenkins, GitLab CI, or AWS CodePipeline Excellent problem-solving skills and attention to detail Effective communication and teamwork skills Preferred Skills: AWS certifications (e.g., AWS Developer Associate) Experience with monitoring and logging tools (CloudWatch, ELK Stack)

About Us Every business needs to know who they’re really working with whether it’s suppliers, investors, partners, or third parties. At Xapien, we’re reinventing how organisations do that, combining speed, scale and accuracy with cutting-edge AI. Since 2018, we’ve grown from a deep-tech startup to a global player in AI-driven due diligence and risk intelligence. 2024 was a landmark year as we closed a $10M (£8M) Series A, earned recognition in the Chartis RiskTech100® and Everest Group’s Leading 50™, and expanded our products, markets and customer base. 2025 has already been even bigger: With new regulations, rising compliance pressure and growing reputation risks, organisations everywhere are demanding smarter, faster ways to work and they’re turning to us. Customers worldwide from global law firms and private banks to universities and nonprofits rely on Xapien to turn days of manual research into trusted insights, delivered in minutes. Our momentum so far Customers in a diverse range of industries, with particular growth in wealth management, insurance, financial services and supply chain onboarding. Demand accelerating beyond our UK headquarters, across multiple continents with new customers in the Middle East, Asia, and Oceania. Why this is an exciting time to join This is not just another tech job, it’s a chance to shape the direction of the due diligence industry with our market-leading product. Whether you’re in engineering, data science, product, AI/ML or infrastructure, you’ll be solving hard, high-impact problems: scaling distributed systems to fuel explosive growth, making sense of multilingual and unstructured data, applying AI/ML to real-world risk, and delivering insights that organisations can trust in high-stakes environments. We’re scaling fast with more customers, more releases, bigger regulatory challenges and a growing expectation that “due diligence” means not only real-time insight, but conducted at pace and cost-efficiency. You won’t just be shipping features, you’ll be shaping architecture, tooling, models, and pushing the boundaries of what’s possible. For people who love learning The Challenge Our product is experiencing tremendous demand, presenting us with the exciting challenge of scaling our platform and technology. We need to deliver accurate insights while doubling down on how we architect, coordinate, and maintain our subsystems. We’re doing all of this against a backdrop of continuous innovation and refinement. The Role We are looking for a Fullstack Engineer (Go + React) to help scale and evolve the core Xapien platform as we grow rapidly. Working directly with our Head of Engineering, you will play a key role in shaping the future of our product. This position involves a mix of backend and frontend development, systems design, and collaborative problem solving across the stack. We are seeking someone with a strong background in modern web development and microservice architecture, and a mindset for clean, maintainable code. Here’s what you will be responsible for: • Designing and building scalable microservices in Go, as part of a growing platform architecture., • Developing intuitive and performant React components to enhance our frontend experience., • Collaborating closely with product and design teams to turn complex user needs into elegant technical solutions., • Writing clean, testable, and maintainable code across the stack., • Participating in architectural discussions and helping shape engineering best practices., • Troubleshooting and resolving production issues across services and systems., • Contributing to CI/CD pipelines, observability, and automation alongside platform engineers. Your Skills & Experience: Must-haves to be successful in this role: • Strong experience writing backend services in Go., • Proficiency in React and modern JavaScript/TypeScript., • Solid understanding of microservices architecture, RESTful APIs, and service-to-service communication., • Experience working with cloud infrastructure (e.g. AWS, GCP or Azure)., • Strong grasp of software engineering fundamentals: testing, documentation, performance, reliability., • Excellent communication and collaboration skills: you're comfortable working cross-functionally with engineers, designers, and product managers., • A team-first mindset: open to feedback, different perspectives, and alternative approaches to coding and code styles. Nobody can do everything, but here are a few related things we’re interested in: • Experience working lower in the stack, e.g., databases, infrastructure, Kubernetes, or observability tooling., • Exposure to CI/CD tooling, • Interest in natural language processing, AI, or distributed systems. Here’s our promise to you: • We are going to work with you – to build a rewarding and fulfilling career with the opportunities, challenges and resources you need to do your best work., • We succeed together – you will own a meaningful part of the business through our employee shares & equity programme., • Private health insurance to keep you in tip-top condition., • Life Insurance – let's hope nobody ever needs this!, • Unlimited holidays – yes, it really is uncapped – take the time you need, when you need it., • Everyone is learning, developing and challenging themselves – so we have a £1k professional development fund per year if you want to learn new skills, even new things outside of work., • Most importantly of all, we will work with you to help you realise your fullest potential, always.

About the Job Senior Fullstack Engineer (React / .Net) – London (Victoria) | Hybrid £80k - £110k Are you ready to craft the next generation of data-driven digital experiences for one of Europe’s most technically advanced SaaS innovators? Our client, a pioneer in B2B SaaS solutions, is building “Your Shipping Analytics Supercomputer”, providing cutting-edge data visualisation and dynamic dashboards for high-velocity business & artificial intelligence. About the Role As a Senior Full-stack Engineer, you’ll play a key role in architecting and developing scalable, high-performance web applications that bring complex data to life. Working across both frontend (React, TypeScript) and backend (.NET Core, C#) technologies, you’ll collaborate with product, design, and data science teams to create seamless, intelligent solutions that define the future of shipping analytics. This is a hands-on engineering role that combines deep technical problem-solving with creativity and collaboration, ideal for someone who thrives in fast-paced, high-growth environments. What You’ll Bring • 5+ years of experience building large-scale, production-grade web applications., • Strong proficiency with React, TypeScript/JavaScript, HTML, and CSS., • Proven experience with C#, .NET Core, and SQL-based databases., • Understanding of Design Patterns and SOLID principles., • Experience designing and consuming RESTful APIs., • Familiarity with Azure or other cloud platforms and configuration management., • Experience with Agile/SCRUM methodologies and modern CI/CD practices. Why Join? • Bootstrapped success story - with multiple thriving business arms., • An executive team with 65+ years of collective experience in shipping management., • Fresh from a £100m AI start-up exit, they’re focusing all their attention on this next big venture. This is an outstanding opportunity to design and deliver the front-end of a platform that’s redefining how businesses interact with data. If you’re a passionate engineer who loves solving complex problems through clean, intelligent design — let’s connect!

Safe Intelligence is on a mission to make AI safe and reliable for everyone. To help us achieve this, we're seeking a Full Stack Software Engineer to join our team! We're particularly looking for someone with strong Golang experience and with some experience of TypeScript and React frontend development. If you also have a knack for Kubernetes/containerisation, that's a significant bonus! In this role, you'll be a key contributor to the development and operation of our cutting-edge cloud-based platform. You should have a passion for both science and engineering, a proven ability to deliver production-ready solutions, and a collaborative spirit to work closely with our product and research teams. All positions at Safe Intelligence are 3/4 days a week in the in our London office. We're excited to have you contribute to our mission! Responsibilities: As a Safe Intelligence Full Stack Software Engineer, you will: • Engineering of Golang-based backend systems, focusing on API development and integration., • Contribute significantly to software development on our TypeScript-based frontend systems, primarily utilizing React to craft intuitive and highly functional user interfaces., • Productize and enhance our Kubernetes-based cloud platform to ensure high-availability, scalability, and cost-efficient ML workflows., • Work proficiently across the entire stack to develop and integrate new features related to model versioning, dataset management, verification workflows, and result/metric aggregations., • Collaborate closely with our scientific and technical teams to interface with and containerize our PyTorch-based verification toolkit., • Champion an API-first development approach to deliver feature-rich, versioned interfaces that support both our TypeScript user interface and Python-based SDKs., • Develop and maintain Infrastructure as Code (IaC) and DevOps pipelines to ensure reliable service delivery and updates. Requirements: The technical requirements for the role are: Must haves: • Ability and experience in system programming using Golang. This includes knowledge of database (MongoDB) access patterns (e.g., Optimistic Concurrency Control - OCC) and schema design, domain-driven architecture, and concurrency., • Proven experience developing production-grade RESTful APIs ideally with an API-first approach., • Some proficiency in JavaScript/TypeScript-based frontend development, with extensive expertise in React. This includes a deep understanding of the DOM, component design, CSS, and state management., • Familiarity with Kubernetes-specific platform components and principles, such as load balancers, cluster DNS, autoscalers, API/SDK toolsets, and the operator pattern. Experience developing and containerizing microservice applications is a plus., • Proficiency in integration and unit testing, with a strong commitment to code quality and maintainability., • Strong knowledge of DevOps and Git best practices. Experience automating version control, testing, and releases, preferably with GitHub Actions. Nice-to-haves: • Familiarity with the OpenAPI specification and code generation toolsets for API development., • Some experience with Python, modern development techniques, and design patterns. Experience in data science tools and ML tools (e.g., NumPy, pandas, scikit-learn, PyTorch) and open-source contributions (especially Python-based) would be a bonus. Familiarity with CUDA, GPU-based computations, end-to-end neural network training, MLOps, and academic research in machine learning are also beneficial., • Experience configuring and maintaining cloud infrastructure including network infrastructure, compute, access control policies, load balancers, Public Key Infrastructure (PKI), and DNS. Ideally, experience with AWS and Terraform or similar IaC tools. At a personal level we’re also looking for someone who is: • Passionate about delivering software to realise safe AI solutions in line with client needs., • Deeply technical and constantly in a state of learning., • Able to communicate clearly and efficiently with a variety of audiences including developers, clients, researchers, partners and executives., • Fearless in getting "hands-on" with technology and execution., • Has a strong understanding of modern software engineering processes., • Comfortable with ambiguity with a drive for clarity., • Collaborative with, and respectful of others on the team., • Honest, straightforward and caring about each other’s well being. Why Safe Intelligence is for you: We strongly believe AI can empower individuals and society to be happier and more productive, but this can only be achieved if the systems we build are safe to use. To meet this need, we are developing advanced deep validation techniques and tools that allow AI/ML engineers world-wide to validate the robustness of their models, as well as repair the fragilities that they discover. By joining us, you’ll be able to help advance the techniques, bring advanced technologies to AI/ML engineers worldwide and contribute to our shared mission to realise successful and reliable AI. Grow with us! If you think you can bring something special to this role, please apply even if you do not meet all listed criteria. Safe Intelligence is exploring uncharted waters, and finding the right crewmates is important to us. We support ongoing learning for the whole team, ranging from individual mentorship to internal seminars and support for sector and technology-specific upskilling. Compensation & Benefits Safe Intelligence provides competitive compensation based on role and candidate experience. In addition, company benefits for all roles include: • Stock option benefits, • Mentoring, learning and development allowance, • Regular team social and work events, • Flexible and generous holidays. We work hard and encourage everyone to take time off to recharge and enjoy other aspects of our lives. Equality and Inclusion We are proud to be an equal-opportunity employer and work hard to create an environment where people of diverse backgrounds and life experiences can thrive. The team is highly collaborative and meritocratic. Great ideas come from everywhere, and we strive to make it easy for people to express themselves and be heard. Location & Office Culture Safe Intelligence is based in London, UK, and we’re focused on building the initial team here. We highly value the ability to work flexibly and remotely at times, but we also have a strong belief that regular in-office interactions make for a much more fulfilling and productive work experience. Our company culture combines optimism for the future (hard problems can be solved with the right effort), speed of iteration (the best ideas come from many ideas tested), and rigour in what matters (correctness and precision are critical for safety). Come and join us to add your skills and passion to the future of Safe Artificial Intelligence!

The Company stackspell labs, Inc. is a venture-backed startup (strategically in stealth) building the AI-native abstraction layer for enterprise software. We’re reimagining how complex enterprise software systems/platforms (e.g., SAP, Salesforce, Workday, Dynamics, etc.) are extended, integrated, configured, and operated by AI agents. Think Lovable meets Terraform for enterprise software. Our core product is a framework purpose-built for AI coding agents, enabling them to express intent, while our platform transpiles, orchestrates, and governs it across the enterprise stack. This abstraction layer unifies and standardizes the primitives of major enterprise platforms, unlocking agentic workflows for transformation and software delivery. It empowers Corporate IT teams to design, configure, and operate secure, compliant, production-grade solutions with the speed and elegance of modern product engineering; finally bridging the gap between enterprise governance and AI-native velocity. The Role You’ll own the end-to-end development of Stackspell’s core platform: designing, coding, deploying, and hardening the systems that make AI-native enterprise engineering possible. Your work blends full-stack development, platform architecture, and applied AI, turning research concepts into production-grade infrastructure. You’ll be hands-on across the stack, from TypeScript and React to orchestration, distributed systems, and AI agent tooling, ensuring everything you build is secure, observable, and enterprise-ready. This role demands both breadth and depth; the curiosity of a researcher and the precision of a production engineer. Your Profile You thrive at the intersection of AI, systems thinking, and developer experience. You’re hands-on, detail-obsessed, and comfortable operating in ambiguity. You care about precision, resilience, and developer experience; not just writing code, but building the platform foundations others can build upon. You understand how modern stacks fit together, from AI pipelines to monorepos, and you enjoy architecting systems that are both powerful and tasteful. Your Hard Skills: TypeScript (React / Express) · RxJS · Tailwind · Docker · Nx / ArgoCD / GitOps · Private Registries TSC · TSX · pnpm / yarn · ESLint · Build Pipeline Hygiene Azure / AWS · IaC (Terraform / Pulumi) Enterprise Architecture · Multitenancy · Zero-Trust · FGA · Event-Driven · Caching · Workflows TypeORM · Drizzle · RabbitMQ · Redis · Distributed Systems · Vercel AI SDK · Prompt Engineering · Agentic Systems · LLM Toolchains · Embeddings · Retrieval · AST / Codegen Applied AI / Systems Research (Bonus) The Offer Location: London (in-person) strongly preferred during the early phase to build tightly as a founding team. Remote possible for exceptional candidates, but proximity gives the best chance to shape the product early. • Competitive compensation + meaningful equity, • Early-stage ownership & impact on product and company direction, • Premium private health insurance (vision & dental included), • Fully covered housing if based in London, • Wellness budget + gym access, • Weekly home service (cleaning, laundry, groceries), • Two fully covered offsites per year