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Senior Full‑Stack C# Developer/Team Lead – London (Hybrid). A leading global trading business is expanding its London technology team and is looking for a lead developer to help build and evolve enterprise‑scale trading and risk systems. Mentoring and supporting developers across the full SDLC

Build and maintain full stack features using modern technologies. Full Stack or Software Developer.

As a Full Stack Engineer within a small team, you will build and implement new features across the full tech stack, with a focus on b. Full Stack Engineer / Developer (Python TypeScript) London / WFH to £120k.

Python Developer / Full Stack Engineer (Python Django React) Remote UK to £80k.Do you have strong Python and Django skills?.You could be progressing your career at a tech scale-up, with recent investment, that is helping vulnerable people to reclaim money due to them via irresponsible lending.As a

We’re looking for a Senior Full Stack Developer to join our growing development team.

Senior Ruby Developer - Leading Health Tech - Hybrid Salary: Paying £75,000 - £105,000 + Equity Industry: Health Tech (Tech for Good) Location: Hybrid, 2 days a week in Central London Office Tech Stack: Ruby on Rails, TypeScript, AWS 👩🏻 💻 The Company 🚀 We're excited to have partnered with a leading health tech business which is transforming an interesting niche within the health tech industry. You will have the opportunity to work on highly impactful products improving the lives of many. The Role ✨ In this role, you will have plenty of ownership/autonomy whilst working in a social environment who like to celebrate each others wins as a team. You will be expected to be confident in a product focused environment and be able to work effectively in a small focused team. This is the right role for someone seeking fulfilling and rewarding place of work. This is a backend leaning full stack role Desired Skills ⚙️ • Ruby on Rails, • TypeScript, • React or Vue.js, • AWS They are willing to move quickly with this role, please apply now if interested. Senior Ruby Developer - Leading Health Tech - Hybrid

Top global trading firm looking for a DeFi developer to join a small, highly technical trading team building high-performance systems that operate directly on decentralized markets. The role is hands-on and focused on building production systems in Rust and Python, covering execution, on-chain integrations, and performance-critical components where latency and reliability are key. There is strong end-to-end ownership and clear visibility across the full trading stack. They are looking for someone with a solid software engineering background and several years of experience (typically around 3–7). Experience with trading systems or DeFi is beneficial but not required.

About us CheMastery is automating how research and manufacture are carried out. The chemical industry is a large and ever-growing market however, the work is still carried out mostly manually and chemical processes remained unchanged over the past 160 years. The lack of standardisation and digitisation created many problems for this fundamental industry, including reproducibility and cost/time efficiency which cost millions annually. A start-up in London, looking to expand its highly interdisciplinary team of exceptionally talented mechanical engineers, software developers, data scientists and chemists. All positions at CheMastery come with an extraordinary level of freedom to showcase your skill. Description The position as a Backend Python Developer is a permanent full-time position. As a Python Developer you will have be part of a brilliant software and hardware development team. Your core responsibility will be on the python side of our robot communication stack, the scheduler as well as data flow to and from the Database. Objectives • Ownership and development the next generation of our python interface to the laboratory automation platform., • The dataflow to and from the robotic platform., • Work on the operations scheduler., • Ownership of code quality, deployment processes, and library choices., • Understand and leverage code testing strategies (unit, integration, component, end-to-end). Your job will enable you to see your code work in action in chemical testing and first-hand with customers. Essential • Strong background in python., • Strong practical experience with databases (ideally postgres)., • Practical experience with multithreading., • Client server architecture., • Experience with efficient algorithm development (e.g. graph traversal)., • Experience in high performance data processing apllications., • Development for linux or unix environments., • Problem solving skills and good interdisciplinary communication., • Open to the environment of a start up with all its challenges and rewards., • Able to work alone and as part of a team., • You must be entitled to work in the UK. Desirable • Experience with C/C++ or firmware development., • Experience with GitHub and GitHub actions., • Project management / history of sole responsibility., • Previous start up experience., • Experience in the life sciences., • Experience with robots and/or safety critical systems., • Experience in statistical analysis and/or machine learning., • Experience with commercial software release and deploy cycles. Location The company offices and labs are based in London, Canada Water. We offer limited working from home but due to the practical nature of the position we will not consider fully remote applicants. About you You should be a curious individual with a passion for coding for applications in the physical world. You should be excited to work in a multi-discipline team and open to learn from other disciplines. What we offer A friendly, transparent, creative, and fast-paced working environment. You will have the freedom to see your project through its entire development cycle from the planning stage, testing all the way to commercial deployment. The wider team includes hardware engineers, data scientists and chemists. Career progression opportunities as the company grows. CheMastery is an equal opportunities employer. If you think you have what it takes to join a team set to revolutionise chemistry, we want to hear from you! The best way to reach us is through this application.

Company: 8 Signals Limited About us 8 Signals is a UK-based software development company specialising in building tailored digital solutions that help businesses solve complex problems and streamline their operations. We combine strong technical expertise with a deep understanding of our clients’ requirements to deliver high-quality software, whether that’s new applications, enhancements to existing systems, or bespoke API integrations. Our team works with a wide range of organisations from small businesses to large enterprises, and values pragmatic, maintainable development that generates real business value. About the role We’re looking for a Full Stack Frontend PHP developer to join our 8 Signals software development team, working on custom web platforms, internal systems, and API-driven applications. This is a primarily remote role with a strong full stack experience. Daily tasks include writing and maintaining clean, modular code, collaborating with team members to execute software development projects, and working to ensure optimal performance and scalability of web solutions. The role also involves front-end compatibility and responsiveness across different devices and platforms. This role is best suited to a mid-level or senior developer who is confident working independently on web applications. Salary £40,000 to £50,000 per annum (depending on experience) Hours of Work Full-time (37.5 hours per week), Monday to Friday however, some flexibility may be required on occasion. Location • Primarily Remote – however candidate preferably based in North East, UK, as may be required to come into the office on occasion., • UK based working hours and time zone., • Occasional travel to client sites / offices., • Travel will be subsidised., • Right to work in the UK is required Skills & Experience Required • Back-End Web Development in PHP with framework experience in Laravel and CodeIgniter., • MySQL/MariaDB database design, querying and optimisation., • Front-End Development with skills in HTML, CSS, JavaScript and jQuery., • Supporting Front-end mobile-responsive development and cross-browser compatibility., • Comfortable working in existing and legacy codebases., • Writing clean, maintainable and well-structured code., • Able to work independently in a remote environment., • Experience with software testing, including unit or feature testing., • Understanding of security best practices (SQL injection, XSS, CSRF), • A self-starter mindset – able to work remotely and communicate well with a distributed team Nice to Have (Bonus) • Experience with API development & integrations, • Building and maintaining custom REST APIs, • Experience with Office365 APIs, • Experience with Stripe APIs, • Experience with email APIs (Mailgun, SendGrid, etc.), • Knowledge of version control systems, such as Git (preferred)., • Experience in Software Development and Programming methodologies., • Good communication skills being able to:, • Clearly explain technical ideas., • Comfortable collaborating remotely with non-technical stakeholders, • Proactive in asking questions and providing updates, • ⁠Comfort working with cloud infrastructure – primarily AWS., • Experience maintaining or modernising legacy PHP systems What’s in it for you? • Salary up to £50,000, • 28 days holiday + bank holidays, • ⁠Fully remote role (UK only), • Flexible working hours, • Supportive team culture with regular virtual check-ins, • ⁠Autonomy and input into technical decisions How to Apply • CV and LinkedIn profile, • GitHub profile or code sample (if available), • Brief summary of your experience with:, • PHP and associated frameworks, • Front-end experience, • MySQL, • API integrations Contact:

About Aero A digital experience company, we sit at the intersection of insights, creativity and technology, crafting digital experiences that transform business performance. We’re a small, fully remote team with big ambitions. We work hands-on with our clients, giving our teams genuine ownership of their work. Every project you touch will be seen by thousands of people and will directly influence how high-profile brands connect with their audiences. Who we’re looking for We’re looking for a front-end developer who’s motivated, curious, and excited to create impactful e-commerce experiences. You’ll be joining at an early stage, which means plenty of opportunity to shape how we work, grow your skills, and leave your mark. If you care about craftsmanship, love solving complex problems, and want to work directly with well-known brands, we’d love to hear from you. Experience We’re looking for someone who has: • 2-3+ years of experience working in a web development agency or in-house for a brand, • Experience developing Shopify themes, • Strong knowledge of modern JavaScript, • Ability to write well-structured, semantic, and accessible HTML, • Confidence writing framework-agnostic, performance-focused JavaScript, • Awareness of WCAG accessibility guidelines, • Solid understanding of front-end performance best practices, • Strong attention to detail when building polished, complex interactions, • A positive, problem-solving mindset and broad technical curiosity, • Experience with modern web tooling (transpilers, linters, build and CI tools, etc.), • Experience with Git and ability to collaborate in a dev team, • Awareness of modern and emerging browser APIs, • Familiarity with progressive enhancement principles Nice to have Not essential, but any of these would be a bonus: • Experience with a front-end/full-stack framework like React or Remix, • Experience with a back-end language, framework, or backend platform like Supabase, • Experience setting up or running A/B tests, • Experience building with a headless CMS, • Previous agency experience, delivering websites for multiple clients, • Deep knowledge in one or more areas such as animation, performance, or accessibility Benefits • Fully remote, forever - work from anywhere in the UK, with flexible hours, • Generous annual leave - 28 days + bank holidays, • Top equipment - high-spec Apple machine provided, • Salary DOE - competitive for your level of experience

Developer Location: Romford Hours: 37.5 per week, full time in the office during training/probation and then hybrid Reports to: Team Lead Are you passionate about driving digital transformation through innovative technology? Do you have experience in developing applications and enjoy working in a collaborative environment? If so, we want you to join our dynamic team as a Developer! About the Role: As a Low-Code Developer, you will play a pivotal role in developing and maintaining both customer-facing and internal low-code applications. Your expertise will help propel our organisation into the future, providing continuous support and improvement of our application portfolio. Key Responsibilities: Spot Opportunities: Identify areas for enhancement in existing low-code applications and help build compelling business cases for change. (10% of your time) Manage Development: Collaborate with fellow developers and business analysts to effectively review requirements, break down tasks, and design low-level technical solutions. Execute initial tests and ensure the quality of code aligns with best practices. (65% of your time) Troubleshoot Issues: Solve challenges by debugging application code and providing ongoing operational support, including upgrades and maintenance. (20% of your time) Ensure Quality: Safeguard our production environment from architectural, performance, or security issues. (5% of your time) Qualifications: Education: Bachelor’s Degree in Computer Science, Business Information Systems, or equivalent professional experience. Experience: Proficient in full-stack development languages such as HTML, CSS, SQL, and JavaScript. Familiarity with Outsystems and/or Python is a plus! Skills: • Strong analytic skills to simplify complex problems for both technical and non-technical audiences., • Excellent oral and written communication skills, including presentation abilities using MS Visio and MS PowerPoint., • Good interpersonal skills with the knack for presenting ideas in a user-friendly manner. What We Value: We believe in collaboration, integrity, and a drive for results. Here’s what we’re looking for in you: Collaborative Spirit: You love building networks and working with others to achieve great results. Innovative Mindset: You embrace change and strive to deliver exceptional outcomes. Technical Strength: You possess strong technical and functional expertise, ensuring high standards in your work. Why Join Us? At our organisation, you’ll be part of a vibrant team that values innovation and teamwork. We offer a supportive environment where you can grow and thrive professionally. If you’re ready to make an impact through technology and be part of a forward-thinking team, we want to hear from you! Let’s drive digital transformation together! Benefits include: • A competitive compensation package, • 25 days holiday (+ public holidays), • 2 external professional training courses per year (taken during work days), • Private health care (taxable), • Frequent company and team events, • Excellent pension plan (employee contributes 5% and employer contributes 10%) Adecco is a disability-confident employer. It is important to us that we run an inclusive and accessible recruitment process to support candidates of all backgrounds and all abilities to apply. Adecco is committed to building a supportive environment for you to explore the next steps in your career. If you require reasonable adjustments at any stage, please let us know and we will be happy to support you.

Senior Product Engineer - Python / Django focused | Full stack JavaScript | US, Global Leader in AI, Series A | Fully Remote (UK) | Salary £80-95k + Bonus + Equity The company: We’re working with a profitable, mission-driven technology company that has been operating quietly at scale for over a decade and is now experiencing explosive growth due to AI demand. The platform connects organisations with high-quality, real human data - data that is now being used by some of the most advanced AI teams in the world to train and evaluate their models. What started in research has rapidly expanded into AI and platform services, and the engineering team is scaling fast to keep up. The business recently restructured into multiple product verticals to handle demand and is now hiring senior engineers to help shape the next phase of growth. The Role – Senior Product Engineer - Python / Django focused | Full stack JavaScript | US, Global Leader in AI, Series A | Fully Remote (UK) | Salary £80-95k + Bonus + Equity You’ll join a senior-heavy, product-focused engineering team working on systems that sit at the intersection of AI, research, and real-world human input. This is a backend-first role (≈70%), with the opportunity to work across the stack where it makes sense. You’ll be expected to think like a product engineer - balancing delivery, quality, and long-term platform health. What you’ll be doing: Senior Product Engineer - Python / Django focused | Full stack JavaScript | US, Global Leader in AI, Series A | Fully Remote (UK) | Salary £80-95k + Bonus + Equity • Building and owning backend services using Python (Django), • Designing APIs and workflows that support high-volume, real-world usage, • Collaborating closely with Product and Design to shape features end-to-end, • Improving platform reliability, scalability, and developer experience, • Contributing across the stack when needed (TypeScript / frontend exposure), • Operating in a fast-moving, slightly scrappy environment where priorities evolve quickly Tech Stack: Senior Product Engineer - Python / Django focused | Full stack JavaScript | US, Global Leader in AI, Series A | Fully Remote (UK) | Salary £80-95k + Bonus + Equity • Python (Django) – core backend, • PostgreSQL, • TypeScript (nice to have), • Vue.js on the frontend, • Modern product tooling and CI/CD practices What They’re Looking For: Senior Product Engineer - Python / Django focused | Full stack JavaScript | US, Global Leader in AI, Series A | Fully Remote (UK) | Salary £80-95k + Bonus + Equity • 4–6+ years of professional software engineering experience, • Strong, production-grade Python experience (Django essential), • Proven senior-level ownership - comfortable operating with ambiguity, • Product mindset: able to think beyond tickets and code, • Excellent communication and collaboration skills, • Experience in start-ups or scale-ups strongly preferred, • No degree requirements Experience in AI, data platforms, or research tooling is a bonus - not a requirement. Interview Process: Senior Product Engineer - Python / Django focused | Full stack JavaScript | US, Global Leader in AI, Series A | Fully Remote (UK) | Salary £80-95k + Bonus + Equity • 30-minute intro call (engineering & talent), • 60-minute paired programming session (Python-focused) - Emphasis on communication, collaboration, and testing, • Product & engineering interview (tech + product thinking), • Final behavioural conversation with senior leadership Why Join: Senior Product Engineer - Python / Django focused | Full stack JavaScript | US, Global Leader in AI, Series A | Fully Remote (UK) | Salary £80-95k + Bonus + Equity • Platform already used globally, now scaling rapidly due to AI demand, • Strong product culture with real-world impact, • Senior-only hiring bar - quality over quantity, • Fully remote within the UK, • Clear growth plans: engineering team scaling from ~60 → 100+, • Competitive package: £85–95k base, Up to 10% bonus, Equity scheme and Market leading benefits If you’re a senior Python engineer who enjoys building thoughtful products, working closely with product teams, and wants to have a tangible impact on how AI systems are built and evaluated - this is a genuinely strong opportunity. Apply with your CV and we’ll be in touch if it looks like a good fit.

Application Software Engineer – JavaScript A fantastic opportunity for talented Software Developers, to join an industry-leading software company in Cambridge offering the opportunity to work on a wide variety of web application infrastructure projects using a diverse toolset, with an emphasis on JavaScript, Node.js and related frameworks. Location – You can choose to be based from the London or Cambridge office (3 days on site, 2 days remote) Salary – Negotiable + comprehensive benefits Requirements for Application Software Engineer – • History of academic excellence including a 2:1 or 1st class honours degree from a leading university plus AAB at A Level (or equivalent UCAS points), • Solid commercial experience using JavaScript and ideally, node.js and related technologies/frameworks - top new graduates considered for the Cambridge office, • You class yourself as a tech innovator and the idea of shaping products and suggesting new technologies really appeals, • Ability to quickly pick up new technologies – working in JavaScript you’re aware new technologies/frameworks emerge all of the time, and you will need to stay abreast of the latest and best technologies to apply to any given project, • Good communication skills Responsibilities for Application Software Engineer – Graduate Considered Work on web applications using a diverse toolset based around JavaScript technologies. While there will be opportunities to work across the stack. The current tech stack includes: Web (UI): JavaScript (backbone.js, d3.js, three.js, pdf.js), Less/CSS Web (Backend): Node.js, PostgreSQL, Elasticsearch, Redis • Develop, deploy and maintain web application infrastructure, • Be a tech innovator and put ideas forward to the team, • If you are keen there is the opportunity to mentor junior members of staff What the role offers: • The chance to work on a diverse toolset of cutting-edge tech, • Working for a leading software company who have a fantastic track record of successfully training and promoting internally, • A great remuneration and benefits package Applications: • If you would like to apply for this unique Developer role then please send your CV via the relevant links! Keywords – Software Engineer / Application Developer / Back-End Software Engineer / node.js developer / node.js Software Engineer / Full-Stack Developer / UI/UX Developer / JavaScript Developer / Vue.js Developer / MEAN Stack Developer / MERN Stack Developer / Meteor.js Developer / Express.js Developer / Web Design Engineer / Web Integration Developer / Web Architect / Software Engineer (Web) / Web Systems Developer/ Web Software Engineer / Web Programmer / JavaScript / Node.js / backbone.js / HTML5 / Less CSS / Computer Science / Web Development / Web Software Engineer / PHP Astrophysics / Software Engineering / JavaScript / React.js / AngularJS / Vue.js / Node.js / ExpressJS / Web UI / Front-end / full-stack / back-end / Developer RedTech Recruitment Ltd focus on finding roles for Engineers and Scientists. Even if the above role isn’t of interest, please visit our website to see our other opportunities. We are an equal opportunity employer and value diversity at RedTech. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

Senior Full Stack Engineer | Up to £110K | One of the UK's fastest growing AI platforms | UK Remote | React/Node/TypeScript I am currently working with one of the fastest-scaling platforms in the creator economy which is a creator-first, AI-powered product that enables creators around the world to directly monetise their audiences. Every system you build will operate at serious global scale. 🎯 The Role As a Senior Software Engineer, this is a hands-on, high-impact role for an engineer who thrives on complexity, scale, and ownership. As the different platforms grow, this role offers a clear path to progress as a Principal IC or Engineering Leader, scaling both the systems and your own influence. What you will do... • Architect scalable systems, • Own features end to end, • Build critical tooling, • Scale third-party integrations, • Raise the bar for developer experience, • Continuously improve code quality, testing, observability, and maintainability across different systems., • Collaborate cross-functionally, • Work closely with product, design, compliance, legal, and operations to balance user experience, regulation, and business priorities., • Move fast, without breaking trust, • Deliver high-quality systems at the pace of a rapidly scaling global platform. Senior Full Stack Engineer | Up to £110K | One of the UK's fastest growing AI platforms | UK Remote | React/Node/TypeScript Who you are... • Strong technical foundation, • Deep experience with TypeScript, React, Node.js, and SQL/Postgres., • Systems thinker, • Comfortable designing complex, interdependent systems with financial, regulatory, and UX constraints., • Hands-on senior engineer, • You love writing code and solving hard problems — from low-latency checkout flows to resilient retry, fallback, and routing logic., • Clear communicator & collaborator, • Able to explain trade-offs, manage stakeholders, and work transparently across teams., • High standards, high velocity, • You move quickly without compromising on security, reliability, or quality., • Ownership & passion, • You take projects end-to-end and genuinely care about building world-class systems. Why Join? • Work on systems that directly impact trust, conversion, and revenue, • Competitive salary, equity, and benefits, • Hybrid or remote flexibility with flexible working hours, • Unlimited holiday, growth & wellbeing budget, • Join a high-calibre, mission-driven team that values ownership, transparency and speed Remuneration & Benefits -> Up to £110,000 + meaningful equity + benefits -> Unlimited holiday -> UK Remote (Office in Canary Wharf if you want to go in) -> Work closely with a brilliant, mission-led team If you want to hear more about the Senior Full Stack Engineer | Up to £110K | One of the UK's fastest growing AI platforms | UK Remote | React/Node/TypeScript please apply ASAP with a CV and we will give you a call if we think you are a match! 😊

We are looking for a talented C++ engineer to design and develop high performance, intuitive native user interfaces used daily by trading and operations teams. You will focus on building clean, responsive desktop applications that support mission critical workflows. This role involves working closely with established APIs and infrastructure to deliver business critical functionality on a regular monthly release cycle. It is a true end to end position, collaborating with backend and systems engineers while contributing across the full native stack using C++ on both the frontend and backend. A strong eye for usability and visual quality is important, making this an ideal opportunity for a developer who values careful UI design as highly as performance and reliability. Compensation is extremely competitive and includes a guaranteed bonus. Technology Stack Primary language C++ User interface frameworks Experience with at least one of the following is preferred MFC using Visual Studio Qt wxWidgets Operating systems Windows and Linux

Senior Quantitative Developer Location: London, UK (Full-time, In-office) Experience: 5–8 Years Compensation: Circa £160,000 Base + Performance-Linked Bonus The Role Are you ready to architect the next generation of autonomous trading? We are representing a top-tier London Hedge Fund looking for a Senior Quantitative Developer to build a fully automated, AI-driven systematic trading system. This role is for a specialist who doesn't just use tools but masters the underlying architecture. You will be responsible for integrating Claude (Anthropic) and advanced AI frameworks into a live production environment to generate alpha in the Equity Options markets. The Technical Challenge: Data at Scale You will be the custodian of a massive, high-fidelity data library. We aren't looking for "standard" Python users; we need an engineer who can optimize at the edge of performance: • Massive Throughput: Design scalable infrastructure to handle massive data loads, ensuring sub-millisecond processing times for large-scale financial datasets., • Historical Depth: Processing per-minute data points spanning 24 years of market history., • Vectorized Performance: Moving beyond Pandas—leveraging Polars for multi-threaded, Rust-backed data manipulation and Dask for distributed compute across clusters., • Execution Engine: Native integration with SpiderRock for complex Equity Options execution and automated risk-routing. Key Responsibilities • System Architecture: Build an end-to-end automated trading system from scratch using a modern, AI-first stack., • AI Integration: Leverage Claude and LLMs for signal extraction, code optimization, and autonomous strategy refinement., • High-Performance Computing: Implement predicate pushdown and efficient Parquet/Arrow storage to ensure backtests on decades of data run in minutes, not days., • Options Logic: Programmatically handle Greeks, volatility surfaces, and risk management through the SpiderRock API. What We’re Looking For • Experience: 5–8 years in a Quant Dev or Systematic Trading environment at a top fund or bank., • Coding Mastery: Expert proficiency in Python (Polars/Dask/FastAPI) and/or C++., • AI Native: Proven ability to use LLMs and Machine Learning to solve complex financial time-series problems., • Industry Standard Experience: You have worked with industry-standard large data before and understand the nuances of point-in-time integrity., • Equity Options Knowledge: Specific experience with options Greeks and execution platforms (SpiderRock is highly preferred). Why Join Us? • Total Rewards: A highly competitive base salary of £160k with a significant bonus structure that rewards PnL contribution., • Elite Environment: Work alongside the best minds in London in a high-conviction, low-bureaucracy trading floor., • Tech Freedom: You will have the mandate to use the best emerging tech (Claude, Rust-based tools) to win.

Founding Engineer Flexible Hybrid (London) £50k-£60k + Equity High Ownership, Real Product, Real Impact The opportunity If you’re an Engineer with a couple of years under your belt and you’re starting to look for more ownership, more responsibility, and faster growth, this is a rare opportunity to join at exactly the right moment. At Staxy we're at a stage where the product is live, customers are engaged, and the technical challenges are only getting more interesting. What we need now is someone who’s excited to step up, learn fast, and grow alongside the company. Who are Staxy? Staxy is an early-stage technology startup building products that sit at the intersection of sport, location data, and real-world behaviour. We work with organisations to better understand how people move, engage, and interact with physical spaces, using mobile technology, location data, and analytics to generate meaningful insight. We're already live with Aston Villa as a cornerstone client, have secured VC funding, and are seeing strong pull from customers who are actively asking them to expand the product. Backed by an experienced board with deep roots in sport and commercial leadership, we're well past the “idea stage” and firmly into building and scaling. The role This is a Founding Engineer role with genuine ownership. You’ll work closely with our CTO, and founders, and will be involved across the full product lifecycle, from shaping features through to shipping them. Day to day, you’ll be: • Building and shipping features across a mobile application and backend platform, • Working end-to-end, not just on isolated tickets, • Collaborating directly with the CTO on product priorities, • Taking ownership of smaller features early on, and growing into larger features and technical decisions over time You won’t be micromanaged, and you won’t be siloed. The expectation isn’t that you know everything, it’s that you’re curious, proactive, and keen to learn. The technology As Founding Engineer, you'll be working with a modern, pragmatic stack: • Mobile / Frontend: React Native, TypeScript, • Backend: Node.js (Fastify or similar), • Data: MongoDB, • APIs: RESTful services and mobile-to-server communication, • Other: Mapping / location-based services There’s also scope to get involved in machine learning over time. We already use ML to process GPS data and understand travel behaviour, and this will become a bigger focus as the platform evolves. You don’t need ML experience right now, interest and curiosity are enough. Key responsibilities • Build and ship features across the mobile app and backend, • Develop and consume REST APIs, • Write clean, maintainable TypeScript, • Work closely with our CTO on technical decisions and implementation, • Take increasing ownership of functionality as you grow, • Contribute ideas and improvements as the platform evolves What we’re looking for Must have: • Commercial experience as a developer, • Good working knowledge of JavaScript / TypeScript, • Experience building and shipping real features (ideally mobile), • Some exposure to Node.js and backend development, • A genuine curiosity and desire to learn, • A passion for startups Nice to have: • React Native / Expo experience, • MongoDB, • Fastify or similar Node frameworks, • Mapping or location-based services, • Payments (e.g. Stripe), • Any exposure or interest in machine learning Growth & progression Because the team is small and early-stage, this is a role where progression is earned, not capped. As Staxy grow, there will be clear opportunities to: • Own larger areas of the product, • Influence technical direction, • Mentor future hires, • Step into more senior or lead-style responsibilities over time If you want a role where you can look back in 12–18 months and clearly see how far you’ve come, this is that environment. Package • Base salary of between £50k-£60k (Some flexibility depending on experience), • Meaningful equity options, offering genuine long-term upside as Staxy grows, • Pensions contributions, • Flexible working, • The chance to work on a live, growing product with real users Interested? If you’re an Engineer ready to step up, learn fast, and build something that’s already gaining real traction, we’d love to hear from you! Apply now or get in touch with our retained talent partner, Jake Ramsey at ISL Talent, to find out more.

Backend Engineer (AI Platform) - London £80k–£100k + EMI equity About the Role We’re hiring a Backend Engineer to build the core infrastructure behind Revax’s AI-native platform for professional services. You’ll design, optimise, and scale the systems that power multi-agent drafting, knowledge graphs, and auditable AI workflows used by accountants, tax advisors, and consultants at leading firms. This is not a “ticket-taking” role -you’ll work directly with the founders, own critical backend services end-to-end, and help define how AI systems are built responsibly in regulated domains. If you enjoy designing clean APIs, scaling Python services, and building systems that actually ship to paying customers, this role is for you. Compensation: £80,000–£100,000 base + EMI equity Location: London About Revax Revax is building a new class of AI-native software for tax advisory firms. Today, professional services teams spend countless hours drafting, reviewing, and re-drafting work - constrained by fragmented knowledge, manual workflows, and brittle tooling. We turn a firm’s own expertise into structured, auditable, AI-powered systems that draft, analyse, and explain deliverables with full provenance. We’re a fast-moving, well-funded startup backed by leading angels, already working with major firms, and building at the intersection of AI agents, knowledge graphs, and real-world enterprise workflows. What You’ll DoBuild & own core backend systems · Build and optimise databases for complex, real-world data · Design and implement APIs using FastAPI for AI workflows and product features · Build and scale LangGraph-based multi-agent systems with checkpointing, retries, and observability · Integrate and scale vector search, knowledge graphs (Neo4j), and associated retrieval pipelines into production services · Deploy and operate GPU-backed services for AI workloads (e.g. inference, embeddings, or agent pipelines) in production Scale & operate production infrastructure · Deploy services on GCP (Cloud Run / GKE) or equivalent cloud infrastructure · Improve performance, reliability, and cost efficiency (latency, throughput, retries, backoffs) · Implement security-first patterns: auth flows, service-to-service auth, IAM, and access controls · Help prepare the platform for enterprise customers (SSO, auditability, compliance ready patterns) Collaborate closely with founders & product · Shape system architecture and API design alongside full-stack and ML engineers · Translate ambiguous product ideas into robust backend implementations · Iterate quickly based on real customer usage and feedback What We’re Looking For Essential · 2-3 years building backend systems for real users · Production experience with FastAPI (or similar modern Python frameworks) · Solid understanding of API design, PostgreSQL, and distributed systems fundamentals · Experience deploying and operating services on cloud infrastructure (GCP, AWS, and Azure) · High ownership mindset: you care deeply about reliability, correctness, and outcomes Strong Plus · Experience with LangGraph, RAG pipelines, vector databases, or knowledge graphs · Familiarity with Neo4j or graph-based data modelling · Experience working on AI-native or agentic systems · Comfort working in early-stage startups with ambiguity and speed · Experience deploying and working with GPU services for AI workloads Bonus · Exposure to professional services, finance, tax, or regulated workflows · You actively use modern AI coding tools (Cursor, Claude Code, etc.) · Strong instincts for developer experience and internal tooling Why Revax · Real ownership over core backend infrastructure · Work directly with founders on high-impact technical decisions · AI-native product with real customers and immediate feedback · Modern stack: Python, FastAPI, LangGraph, Postgres, Supabase, Neo4j, GCP · Meaningful early-stage equity: we hire owners, not passengers · A lean, low-ego, high drive team that ships fast and cares about their work Practical details · London based (strong preference for in office collaboration) · Visa sponsorship available

We have a Full Stack Developer opportunity with a growing technology company building software platforms for complex, data-intensive technical workflows. The organisation focuses on developing user-facing systems that enable large-scale computational processes, replacing fragmented or manual approaches with scalable digital solutions. As a Full Stack Software Engineer, you will work across backend services and frontend applications, contributing to end-to-end feature development in a fast-moving, engineering-led environment. This Will Offer You • End-to-end ownership of features across backend and frontend systems, • Exposure to data-intensive applications and complex technical workflows, • Close collaboration with product, infrastructure, and engineering teams, • A high-autonomy role within a fast-paced development environment, • Opportunities to contribute to platform design and developer tooling, • Competitive compensation and long-term growth opportunities Your Responsibilities • Build and maintain backend services, APIs, and data-processing pipelines using Python, • Develop and extend frontend applications using Next.js and React, • Design and maintain RESTful APIs and client–server integrations, • Write and maintain unit and acceptance tests, integrating with CI workflows, • Collaborate using Git-based workflows and contribute to shared codebases, • Take ownership of features from design through deployment, • Ensure code quality, reliability, and maintainability across the stack You Will Bring • 2+ years of professional experience as a software engineer, • Strong Python skills, including building production-ready services and APIs, • Experience developing frontend applications with React and Next.js, • Understanding of RESTful architectures and backend–frontend integration, • Familiarity with modern frontend tooling (TypeScript, CSS frameworks, component-based design), • Experience writing tests and working with CI/CD pipelines, • Experience with containerisation and cloud environments, • Familiarity with developer tooling or internal platforms, • Exposure to data-intensive or ML-adjacent workflows, • Experience working with databases (SQL and/or NoSQL)

We are partnering with one of London’s most selective and highest-performing quantitative investment funds to appoint a Senior Quant Developer to their core systematic trading group. This is a confidential mandate for a team renowned for world-class engineering standards, scientific rigour, and a culture built around high impact and low ego. The successful candidate will work at the intersection of quantitative research, data engineering, and high-performance software development — with code that moves rapidly from prototype to production and directly influences trading performance. The Role As a Quant Developer, you will: • Collaborate closely with quant researchers to productionise models and design scalable research/tooling infrastructure, • Develop high-performance, robust code across Python and C++, • Build and maintain data pipelines, research platforms, and components of the live trading stack, • Optimise system performance, reliability, and throughput across large-scale datasets, • Contribute to architectural decisions across the full research-to-execution workflow What We’re Looking For • Exceptional programming skills in Python and/or C++, with a focus on writing clean, performant production code, • Strong understanding of core CS fundamentals (algorithms, distributed systems, profiling, testing), • Experience in a systematic trading environment or quantitative data domain is highly advantageous, though not essential, • A problem-solver with the ability to work collaboratively in a highly technical, research-driven environment, • Humility, curiosity, and a desire to build systems that have real, measurable impact, • Computer Science or STEM degree from a good university Why This Role Stands Out • Opportunity to join a top-performing fund with a deeply technical culture, • Work directly with elite researchers and developers on complex, meaningful problems, • Highly competitive compensation with significant performance-based upside, • Exposure to world-class infrastructure, datasets, and compute environments, • A role where strong engineering truly drives investment performance

Full Stack Developer - Front End Focus - Vue/React, .NET Hybrid - x 2 per week, Central London Professional services Join a collaborative engineering team working on several high‑impact internal projects. We’re looking for a Full Stack Developer with strong front‑end experience in Vue to act as the team’s front‑end specialist, helping shape UI architecture and building modern, responsive applications. What you’ll be doing • Leading on front end development and helping to set the approach for front end architecture, • Building and maintaining modern web applications with the UX designer and wider development team, • Working across the full software development lifecycle in an Agile environment, • Collaborating with product and technical teams to shape and refine requirements, • Contributing to testing, documentation and ongoing improvements across the team What we’re looking for • Expert in modern front-end tech - Vue (mandatory), React/Angular (nice to have), • C#/.Net - this will be a small part of the role but necessary, • Experience working with component based development and design systems, • Strong understanding of REST APIs, unit testing and Git, • Experience with SQL, EF Core or Dapper, • Experience working with UX and design tools such as Figma or Adobe XD, • Experience with end to end or integration testing, ideally using Cypress or Playwright Unfortunately sponsorship is not available for this role. If this sounds like a good fit for you, please apply with an up to date CV.

We are currently recruiting full stack developers to join a trading technology team at a leading investment firm. This team is responsible for building a new front-office trading platform used directly by traders and quants. These roles are best suited for candidates with experience in full stack development using React and Python and particularly those who have built trading platforms from the ground up. Candidates who wish to apply must have previous experience in the development of front office trading systems and must be comfortable facing to the traders and quants. Required skills: • Full stack development experience using React + Python, • React: AG Grid, Charting, WebSockets and data visualisation, • Python: Core Python experience around multi-processing and async programming, • Data: Experience building data heavy trading applications, • System design and architecture, • Domain knowledge: FX, Rates, Fixed Income Other info: • Applicants must have right to work in the UK, • Applicants must be present in the UK and must be able to commit to 2-3 days working onsite in the London offices Please submit your CV immediately to be considered for this role.

🌍 Fullstack Software Engineer | AI Startup | NYC (Onsite/Hybrid) A seed-stage AI team is building smarter, developer-focused tools for OCR and document intelligence. They’re small, fast, and deeply technical — designing smooth inference workflows, clean parsing interfaces, and a platform that helps thousands of engineers build ML-powered products with less friction. About the role You’ll shape the full journey from raw model output to polished user experience. Expect hands-on work across the stack, helping engineers explore, evaluate, and deploy document-understanding systems in real products. 💡 What you’ll work on • Build interfaces that make complex extraction feel clear and intuitive, • Move between APIs, inference layers, and UI to improve reliability and performance, • Collaborate with founders, users, and the open-source community to refine ML-driven workflows 🚀 What they value • Strong product sense and attention to user experience, • Clear thinking around developer workflows, • Comfort working across backend and frontend in a fast, early-stage setting Compensation Salary up to $250,000 plus meaningful equity. If this sounds interesting, apply now!

Role: Software Engineer - AI Agents | Rust | Typescript | React Location: London, 4 days in office (Shoreditch) Salary: Up to £200,000 About the company We’re an early-stage technology company building a new AI-powered product focused on improving how organisations design, reason about, and operate complex models and workflows. The initial product targets a critical but underserved area where high-impact decisions are made using outdated tools and fragile processes. While these workflows sit at the core of many businesses, the underlying software has seen little meaningful evolution. Longer term, the ambition is to build a broader platform that supports the full lifecycle of complex decision-making, spanning modelling, collaboration, and execution. We believe this represents a large, durable opportunity and a new category of applied AI software. The team is small, highly technical, and product-focused, with an emphasis on speed, quality, and ownership. The opportunity This is a chance to join very early and help shape both the product and the engineering approach from first principles. You’ll work in a tight-knit team building foundational product capabilities where performance, correctness, and usability all matter. Engineering decisions directly influence product direction, user trust, and long-term technical foundations. The role is intentionally broad and well-suited to engineers who enjoy high ownership, technical depth, and working across boundaries. What you’ll do • Build and evolve core product features from early foundations., • Own features end to end, spanning backend services, APIs, and frontend user experiences., • Work across Rust for performance-critical systems and TypeScript across the product stack., • Build and maintain React-based user interfaces for complex, interactive workflows., • Use modern AI-assisted development tools to improve speed and code quality., • Design and optimise systems with a focus on performance, reliability, and correctness., • Improve internal tooling, infrastructure, and CI to support rapid iteration., • Collaborate closely with product and design to deliver cohesive, high-quality experiences., • Take responsibility across the full product lifecycle: building, shipping, operating, and iterating. You should have • Strong engineering fundamentals and experience building high-quality software systems., • A product-minded approach, with ownership of meaningful features or components., • Comfort operating in early-stage, high-ambiguity environments., • High agency, curiosity, and a bias toward action., • Ability to learn quickly and work across the stack., • A preference for small, talent-dense teams. Tech stack & environment • Modern backend services and APIs., • Strong systems foundations using both statically and dynamically typed languages., • Frontend development for complex, interactive user-facing tools., • Cloud-native infrastructure and production operations., • AI-first development workflows and internal tooling., • Emphasis on performance, reliability, and developer experience. Why it’s exciting • Join at the ground floor of a new product with strong traction., • Work in a small team where individual contribution has outsized impact., • High autonomy and meaningful influence over product and technical direction., • Tackle hard, abstract problems with real-world consequences., • Competitive compensation aligned with early contribution.

Flutter Software Engineer About us: Tewke is a growing startup on a mission to change the way people live within their homes, empowering them to automatically save energy and improve their living environment. Tewke is revolutionizing the way homes operate by focusing on sustainable and efficient living. Our touchscreen devices simplify smart homes to save energy, protect health, and enhance automation and security. By eliminating the need for multiple apps and devices, Tewke offers an integrated and straightforward approach. Join us as we lead the charge in creating a healthier, smarter habitat for all. We've developed our own hardware and software to create one of the most advanced home automation platforms in the world. By combining smart grids with home automation, we are pioneers in intelligent control and energy consumption. We are growing fast and looking for wildly ambitious people at the beginning of their career, looking to reshape a rapidly changing industry, to join us as we enter the next stage of development. About the role: We are seeking a talented Flutter Developer to join our team. The ideal candidate will thrive in a fast-paced environment, enjoy taking on responsibility and owning a project, and possess a passion for creating exceptional mobile applications. You will play a crucial role in developing a mobile app for both Android and iOS platforms, integrating with proprietary and third-party APIs, and collaborating closely with backend engineers, designers, and stakeholders to ensure a seamless user experience. The mobile app will sit alongside Tewke’s flagship product, the Tewke Tap intelligent light switch. What you will be doing: • Leading the development of Tewke mobile application for iOS and Android phones using the Flutter framework., • Integrating the Tewke app with our other systems to deliver a smooth user experience for our customers., • Launching software products to an international audience. About you: The ideal candidate will have worked for at least 2 years as Flutter developer working on mobile applications. They should be comfortable working in a fast-paced, dynamic environment with other software engineers across a wide technical stack. We would prefer someone who can work in our London (Southwark) office at least 3 days a week, however we will consider remote candidates. You will need to have the right to work in the UK. • Proficient in Dart and the Flutter Framework, • 1+ years experience working on iOS / Android applications, • Bachelors/Masters degree in Computer Science or similar, • Experience integrating with proprietary and 3rd party APIs, • Ability to work independently, • Good working knowledge of Git and experience with version control software from providers such as GitHub or GitLab, • Write clean, efficient, and reusable code Nice to have: • Experience as a full stack engineer to work across cloud and app infrastructure, • Experience publishing apps in the Apple App Store, • Experience in a small team working independently, • Comfortable using BLoC for state management, • Experience using WebSockets, • Experience working with home automation The perks: • Full autonomy to direct your area of Tewke., • Breakfast in the office every morning before 10am., • Working with an environmentally focused company that’s fighting climate change., • Unlimited holiday., • Share options., • Flexible working- work anytime, anywhere outside of our core hours (Monday-Thurs, 10:00-16:00)., • Fortnightly team socials., • Cycle to work scheme., • Discounts on buying tech products for personal use. Salary £50-60k

DeFi Developer — High-Performance Crypto Trading Systems (London) Our client is hiring a sharp, ambitious DeFi Developer to join their DeFi trading team building high-performance systems that operate directly on decentralized markets. You’ll work hands-on across the full trading stack — from on-chain integrations and execution logic, to infrastructure, monitoring, and performance optimization. What you’ll do • Build and ship production-grade code (primarily Rust + Python), • Develop systems that interact with on-chain protocols and infrastructure, • (Solidity, JSON-RPC, Solana, MEV workflows, etc.), • Improve real-time monitoring, execution pipelines, and strategy tooling, • Debug and optimize end-to-end performance: latency, reliability, throughput, • Work with protocol teams and external projects to unlock new market opportunities, • Grow into end-to-end ownership across DeFi integrations and trading infrastructure Why this role is unique • Full systems exposure — infrastructure, execution, strategy logic, on-chain interaction, • DeFi at the core — learn how protocols work under the hood and how on-chain dynamics create edge, • Elite teammates — small, world-class group of engineers, quants, and traders, • Startup velocity — fast decisions, frequent shipping, immediate production impact This is an ideal role for someone who sees themselves as a top technologist and wants to work in one of the most cutting-edge environments in finance and crypto. What we’re looking for We’re looking for driven developers who want to learn fast by working on hard, meaningful problems. You should have: • 3–7 years of professional software engineering experience, • Strong fundamentals and ability to write clean, testable, efficient code, • Solid CS foundation: algorithms, data structures, concurrency, networking, etc., • Strong ownership mindset and clear communication Signals of technical excellence (any of these helps): • Top academic performance in CS / math / physics / engineering, • Competitive programming / olympiad success (ICPC, IMO, IOI, IPhO, etc.), • Experience at a highly selective tech company, trading firm, or fund Language & technical background • Rust preferred, but you should be strong in at least one systems/statically typed language:, • C++ / Java / Go / C# / Kotlin / similar Nice to have Strong preference • Understanding of trading systems, market structure, or strategy implementation Bonus • DeFi familiarity: smart contracts, blockchain APIs, MEV, Solana, • Rust experience, • Infrastructure/observability tools (AWS, Grafana, etc.), • Strong math/stats background (modeling, simulation) Team culture Our client values: • High ownership and initiative, • Curiosity, intellectual honesty, and rapid learning, • Clear, direct communication, • No ego, no politics — just building and improving together

C# Developer / Backend Software Engineer C# .Net AWS (Junior - Mid) London to £80k Are you a bright, ambitious C# Developer who enjoys collaborating and working on complex systems with cutting edge technology? You could be progressing your career at a highly profitable, systematic Hedge Fund that invests in sports betting markets whilst enjoying a range of perks and benefits including hybrid working and a sociable team environment. As a C# Developer you'll join a cross functional Agile product team responsible for high-value business critical betting execution systems. You'll be building systems to manage large datasets which can process updates in real-time with high throughput and low latency; these systems are released with high frequency with technology choices that are continuously evolving. There's a focus on backend development with C# .Net and Kubernetes however you will work across the full stack, using TypeScript and React on the client side. You'll take ownership of projects and collaborate with a team of highly skilled engineers as well as business stakeholders, continually learning, assessing new technologies and making recommendations within a flat structure. Location / WFH: You'll be based in fantastic offices in a vibrant area of London with in-house gym and steam room, games room with pool tables and dart boards, library and free high quality catering (breakfast, lunch, dinner) from the onsite chef with flexibility to work from home once a week week (please note that during probation you will be required onsite five days a week). About you: • You're degree educated in a STEM discipline, Computer Science, Mathematics or Physics preferred, 2.1 or above from a top tier university (e.g. Russel Group, Oxbridge, World top 100), • You have C# serverside development skills, including .Net Core and multi-threading, • You have a good knowledge of AWS and Kubernetes, • You have a good understanding of CQRS and Event Driven systems, • The tech stack also includes JavaScript / TypeScript and React for client side applications; experience with any of these would be beneficial but you can pick them up on the job, • You're commercially aware and keen to understand the business impact of what you do, • You have excellent communication, collaboration and problem solving skills, • Ideally you will have an interest in sports with an understanding of betting What's in it for you: • Competitive salary, to £80k, • Pension, • Private medical care and wellness days, • Training and conference budget to support your personal development Apply now to find out more about this C# Developer / Backend Software Engineer (C# .Net AWS Junior - Mid) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.

Are you a talented, super-ambitious full-stack developer? Excited by building solutions to real-world challenges? Motivated by owning shares in a high-growth business? Want to join a team of smart, committed, and highly functioning professionals? This might be the role for you! The company… Our client is an ambitious, fast-growing EdTech disruptor. They exist to create a world where educators are liberated from administrative burdens and empowered to focus entirely on what matters most—nurturing the potential of every student. Their mission is to unify the fragmented landscape of school technology through intelligent, human-centred design. By replacing disconnected silo systems with one seamless platform, they restore joy to teaching, strengthen connections between schools and families, and empower students to take ownership of their learning journey. They partner with educators to build software that serves people, not the other way around. Schools are often stuck juggling siloed systems that don’t talk to each other, creating frustration, duplication, and wasted time. The team have lived that reality themselves, and it’s exactly what they set out to fix. They started by transforming how music departments are managed and quickly became the market leader. Now, they’re scaling that approach across schools more broadly, building tools that bring activities, communication, and data together into a single intuitive platform. Their distinctiveness lies in their world-class technical talent, producing elegant software solutions, a profound passion for education's transformative potential beyond the core curriculum, and their impatience with inefficient systems that hinder children's potential. They move fast, listen carefully to users, and value people who take initiative. The role… They’re hiring their second full-stack developer to work closely with their experienced Lead Developer and CPO to supercharge their development capacity. The role will involve quickly building and evolving areas of the platform, with a focus on customer success. This role is central to enhancing platform adoption, and to this end, the first few months will be spent working closely with schools to help onboard, train and increase adoption. The role comes with a high degree of ownership and will be rewarding for an individual who can proactively apply their technical prowess to adapt our platform to help customers. Key Responsibilities • Pursue excellence in rapid product development: Use all means at your disposal to write excellent code and increase value for the teachers, parents and students using the platform., • Pursue excellence in customer success: During the initial 3-month period, proactively increase platform adoption and engagement, ensuring customers fully leverage it to manage their school. Continue with this mindset as a full member of the product development team., • Team fit and agility: Engage in product and customer-focused discussions within the team, collaboratively solving puzzles and balancing needs between different priority areas., • Platform support: Provide technical support as needed, ensuring rapid, effective issue resolution to enhance satisfaction and drive platform adoption. This role is suited to someone seeking more than just a job. It is suited to someone who wants a stake in a business and is relentless in the pursuit of growth. The package • £60,000 salary, • A stake in the success of the company through share options, • Fast-growing company with plenty of room for progression, • 34-days holiday, including bank holidays., • Uncapped training and development budgets, • Vibrant team with regular socials, like pool, darts and drinks, • Team retreats, • Weekly lunches, • 6 monthly pay reviews, • Opportunity to work in a uniquely high-performance team - if you're impatient for progress, then we're the place you'll thrive, • Regular Mario Kart action! To be successful, you will… • Have experience with React / NodeJS, • Have expertise in Typescript/JavaScript, with proven experience in development role(s), • Have exceptional problem-solving abilities, proven in diagnosing and fixing complex technical issues, • Have excellent communication skills, able to foster strong customer relationships while bringing technical solutions, • Have a good understanding of software development practices, • Have a commitment to ongoing learning and adapting to new challenges in a dynamic environment Ideal, but not essential… • Experience with MongoDB, • Experience with AWS-style cloud platform architecture, • Knowledge of automated testing tools and frameworks, • Experience using AI tooling to amplify development output, • A passion for enhancing product user experience Apply! If you’re smart, incredibly driven, and want to build something big, apply now.

Full Stack Engineer (Web & Data) Industry: Technology / Digital Products / Automation & Analytics Location: London, UK (Hybrid 1-2 days) Are you passionate about developing seamless, data-driven digital experiences? An established digital transformation and technology solutions provider is looking for a Full Stack Engineer (Web & Data) to join its growing Automation & Analytics team in London. This hybrid role blends web development with data engineering, offering exposure to everything from dynamic front‑end interfaces and API development to cloud‑based data pipelines and analytics platforms. If you love combining creativity in web development with the logic and scalability of data engineering, this is your opportunity to grow in a cutting‑edge environment. What You’ll Do • Design, develop, and maintain end‑to‑end web applications—from intuitive front‑end interfaces to robust back‑end servers and APIs., • Build and optimise data platforms and ETL/ELT pipelines supporting analytics and AI‑driven applications., • Prepare and structure data for dashboards, reporting, and machine learning solutions., • Collaborate with consultants, data scientists, and project teams to deliver reliable and scalable systems., • Manage CI/CD deployments and version control across hybrid AWS and Azure environments., • Analyse system performance, troubleshoot issues, and continuously improve existing solutions. Essential: • 1–2 years of experience as a Full Stack Engineer, Web Developer, or Data Engineer., • Bachelor’s or Master’s degree in Computer Science, Engineering, or a STEM field., • Proficiency in Python and SQL for back‑end logic and data operations., • Hands‑on experience with front‑end frameworks such as React or Next.js., • Experience creating and maintaining APIs, working with relational/non‑relational databases., • Familiarity with data orchestration tools (e.g. Airflow) and data warehouse/lake design., • Practical knowledge of AWS or Azure cloud environments., • Strong understanding of Git, CI/CD, and modern deployment practices., • Experience with WordPress/PHP or Streamlit for rapid web applications., • Familiarity with dbt, Power BI, or similar data analytics tools., • Understanding of machine learning, AI integration, and vector databases., • Interest in UI design or Agile project delivery. This role offers a rare opportunity to develop both front‑end and data engineering capabilities within a forward‑thinking digital solutions team. You’ll gain hands‑on experience with next‑generation technology stacks, cross‑functional collaboration, and projects shaping how global enterprises use data and automation. Please apply with your latest CV showing all relevant experience and email your CV with your salary expectations, availability to interview and start working Dr Marina Economidou, Executive Solutions Consultant

About Nyxium Nyxium is a London-based deep tech company backed by top-tier investors. We are building an agentic AI and geospatial intelligence platform that supports siting, permitting, impact assessment, and decision-making for complex infrastructure projects, including energy systems, data centers, and other critical infrastructure. Location London Right to work in the UK required (visa sponsorship considered on a case-by-case basis) Time Commitment & Working Arrangement This is a full-time position (40 hours per week). The role requires focused, dedicated commitment to Nyxium. • External paid work, consulting, or freelance engagements outside Nyxium are not permitted during employment., • Any academic affiliations, advisory roles, or unpaid activities must be disclosed and must not conflict with Nyxium’s work, priorities, or intellectual property., • We value sustainable working practices and do not expect routine overtime, but we do expect full professional focus during agreed working hours. Role Summary We are hiring a Senior Full-Stack Software Engineer (AI / ML) to build and own Nyxium’s core application and ML integration layer. This role sits between: • AI and ML systems (LLMs, NLP pipelines, decision logic), • Backend services and APIs, • Data and document workflows This is a senior individual contributor role with strong architectural ownership. Key Responsibilities AI-Enabled Backend Systems • Design and build backend services that integrate AI and ML workflows into production systems, • Develop APIs and orchestration layers, • Ensure AI outputs are traceable, explainable, and suitable for audit and regulatory review, • Develop Retrieval-Augmented Generation (RAG) and LLM-based pipelines for data imputation, NLP analysis, and decision support. Document, Workflow & Platform Intelligence • Build systems that process, normalize, classify, and enrich large volumes of structured and unstructured documents, • Implement intelligent workflows for:, • Regulatory documentation, • Compliance evidence tracking, • Developer and user automation, • Design pipelines that balance ML-driven inference with deterministic rules and safeguards Full-Stack Application Development • Build and maintain user-facing applications that expose complex AI outputs in clear, actionable ways, • Implement interactive dashboards, workflow UIs, and operational tools, • Collaborate on frontend architecture using modern frameworks (React / Next.js), with a focus on correctness and clarity rather than visual novelty Data & API Engineering • Design schemas and APIs for systems that combine:, • ML outputs, • Geospatial attributes, • Regulatory and temporal data, • Work with Postgres (PostGIS a plus), MongoDB, and analytical data stores, • Build reliable async processing, background jobs, and batch pipelines Production Quality & Developer Experience • Improve system reliability, testing coverage, and observability, • Contribute to CI/CD pipelines and deployment workflows, • Raise internal standards for code quality, documentation, and maintainability, • Build systems that other engineers and stakeholders can confidently rely on Collaboration & Ownership • Work closely with founders on roadmap execution and technical trade-offs, • Collaborate daily with the Geospatial AI Engineer to integrate spatial intelligence into the platform, • Take full ownership of major system components from design through deployment, • Contribute to technical decision-making as the platform scales Required Qualifications Education • Both bachelor’s (from world top 100 universities) and master’s degree in computer science, Data Science, or a closely related field, • Equivalent industry experience considered Core Technical Skills Programming & Backend • Strong Python experience in production systems, • Experience with FastAPI, Flask, or similar frameworks, • Hands-on experience integrating ML or LLM systems into real applications, • Familiarity with NLP pipelines, document processing, or AI workflows, • Experience with SQL and NoSQL databases, • Schema design for complex, evolving data models, • Working knowledge of React and modern frontend patterns, • Experience deploying systems on AWS and/or GCP, • Familiarity with Docker, CI/CD, and production monitoring Experience • 5+ years of professional experience in software engineering, data engineering, or ML-enabled systems, • 5+ years of experience in geospatial analytics, applied ML and computer vision, including production systems, • Demonstrated experience delivering end-to-end ML solutions in complex, real-world environments, • Proven experience shipping production systems used by real users, • Comfortable operating in early-stage or high-ownership environments Preferred / Nice-to-Have • Experience with geospatial data or spatial platforms, • Experience in environmental, infrastructure, healthcare, or regulated domains, • Experience building internal tools, developer platforms, or workflow automation systems, • Background in developer experience or platform engineering What Success Looks Like • You ship reliable, production-grade systems that form the backbone of the platform, • AI and ML capabilities are usable, trustworthy, and well-integrated, • Developers and users experience clear, stable workflows instead of brittle tools, • You raise the overall engineering bar through thoughtful system design and execution Compensation Salary and equity • We offer above market, competitive salary (Up to £95,000 annual) and meaningful equity., • Final offer depends on experience and scope of responsibility. Benefits • Flexible, remote-first working arrangement, • Pension contributions (UK auto-enrolment), • Paid annual leave and UK public holidays, • Direct access to founders and real influence over technical direction, • Opportunity to work on high-impact, technically challenging problems from the ground up Why Join Us • You will build core systems, not surface features, • Your work will directly shape a category-defining platform, • You will operate in a small, senior, high-trust technical team, • You will work on problems that matter in real regulatory and infrastructure contexts Please follow our LinkedIn page for more openings. Please feel free to reach out if you have any questions at

Senior Full Stack Engineer / Developer (TypeScript Elixir AWS) London / WFH to £100k.Do you enjoy problem solving and working with a range of technologies including functional programming languages such as Elixir, using the right tool for the job?.You could be progressing your career in a senior, h

UK (Hybrid, with flexibility for client site travel).Eligible for UK security clearance.This is an opportunity to develop innovative solutions in a collaborative, client-facing environment while growing your skills in a fast-paced consultancy setting.Build and maintain microservices using.Develop fr

Full Stack Developer (C#/React) A global, technology led quantitative investment manager is hiring a Full Stack Developer to join its core engineering group in London. The firm trades systematically across all major liquid asset classes and relies heavily on high quality software, data pipelines, and analytics to support research and trading at scale. This role sits close to the investment process and focuses on building production grade tools used daily by quantitative researchers, analysts, and portfolio teams. What You'll Be Working On You'll help design, build, and maintain systems that provide Real Time and end-of-day insight into trading activity and strategy performance across the firm. Key responsibilities include: • Developing end-to-end applications using C# on the Back End and React on the Front End, • Building analytics, reporting, and visualisation tools consumed by hundreds of quantitative researchers, • Integrating data from multiple internal trading and research systems, • Designing scalable, maintainable services that operate in a high-throughput, low-latency environment, • Owning production workflows, monitoring, and ongoing system improvements, • Continuously evolving the platform to support new asset classes, strategies, and research requirements, • Strong C# development experience (Back End services, APIs, data processing), • Working knowledge of Python (used alongside C# in the research and analytics stack), • Frontend experience with React, ideally including MUI, AG-Grid, and ECharts, • Solid SQL skills and experience working with large datasets, • Exposure to financial markets, trading systems, or quantitative environments, • Experience building analytics or data-visualisation platforms

Central London, Greater London - United Kingdom.Join a high-growth technology and AI consultancy recognised for delivering exceptional outcomes across Defence, Healthcare, Finance, and Commercial sectors.Our client has built a reputation for solving some of the most complex data challenges in govern

Lead Full-Stack Developer (Software Engineer Programmer Developer ReactJS React-JS React. Role: Lead Full-Stack Developer (Software Engineer Programmer Developer ReactJS React-JS React. Strong experience as a Lead Full-Stack Developer/Software Engineer/Programmer.

Hexwired Recruitment has partnered with a pioneering medical training provider based near London who are now seeking a Lead Full Stack Developer to help with a combination of code migration and new product development. This is an excellent opportunity for someone looking to use the latest tools and

Location: Remote with occasional travel to Croydon.We are seeking an experienced Backend Developer to join a key public sector programme focused on delivering secure, high-performance systems that support critical government services.Spring (Framework, Boot, Data).Respect and equality are core value

As a Full Stack Engineer, you'll design and deliver features across a modern stack, working on scalable backend services and intuitive front-end applications that present complex data clearly. Senior Full Stack Engineer - C#,. Building full-stack features using C#,.

Essential skills/knowledge/experience:.Python driven UI frameworks: Dash, Streamlit (preferred over React/Angular).Expert level Python programming (mandatory).Experience with Delta Tables or similar modern data lake table formats.Desirable skills/knowledge/experience.On Prem + Cloud Hybrid Experienc

Required Skills & Qualifications.REST APIs, JSON, OpenAPI/Swagger.PayEdge or similar payment platforms.Reactive programming (WebFlux).Strong problem-solving and analytical skills.Excellent communication and collaboration abilities.Ability to work in Agile / Scrum environments.Ownership mindset a

Title : Fullstack developer into Ecommerce Domain Location : London, UK Hybrid to office JD : · Experience in delivering ecommerce solutions. · Design and development experience in eCommerce. · 10+ years of full stack development expertise (Node.js, React.js, Lambda programming, GraphQL, Type Script, workflow) · Should have used and enabled AI across design, development and testing. · Functional knowledge about order orchestration – (order to cash) · Should have used and enabled AI across design, development and testing. · Functional understanding of middleware – (Kafka) · Experience in delivering ecommerce solutions. · Design and development experience in eCommerce · Additional knowledge or exposure required o Netlify o Noibu o Constructor o Graphql o workflow (Conductor)

Experience in overall payment ecosystem, Integration and Maintenance, reconciliation, payment policies and process. · Experience on implementing payment solutions specifically with Stripe · Design and development experience in eCommerce and payment · 10+ years of full stack development expertise (Springboot, Microservices, Node JS for payment integration.) · Linux, Spring Boot 2.0, AWS Lambda, ReactJS, Node JS, MySQL on AWS RDS, AWS Elasticsearch · Should have used and enabled AI across design, development and testing. · Experience in delivering ecommerce solutions and payment · Design and development experience in eCommerce and payment · Functional knowledge about order orchestration – (order to cash) · Functional understanding of middleware – (Kafka) · Additional knowledge or exposure required · Netlify · Noibu · Constructor

Top global trading firm looking for a DeFi developer to join a small, highly technical trading team building high-performance systems that operate directly on decentralized markets. The role is hands-on and focused on building production systems in Rust and Python, covering execution, on-chain integrations, and performance-critical components where latency and reliability are key. There is strong end-to-end ownership and clear visibility across the full trading stack. They are looking for someone with a solid software engineering background and several years of experience (typically around 3–7). Experience with trading systems or DeFi is beneficial but not required. What they’re looking for: • Strong production experience with Rust and Python, • Hands-on experience with smart contracts and Solidity at an application level, • 3–4+ years in crypto or DeFi-native roles, • Deep understanding of decentralized exchanges and the current DeFi landscape, • Experience building and maintaining public APIs, • Understanding of trading concepts, either practical or theoretical, • Ability to run and maintain systems on cloud infrastructure, • Based in London or working remotely from anywhere in Europe Nice to have: • Experience designing, writing, and deploying smart contracts, • On-chain trading or strategy development experience, • Familiarity with ecosystems such as Solana, Sui, or Cosmos, • Experience diagnosing performance, latency, or throughput issues, • Interest in product design and user experience alongside engineering

1. Position Overview The team is looking for a hands-on Full-Stack Engineer who can hit the ground running to design, develop, and ship a new web-application. The role requires deep expertise in a C#/.NET back-end, a React front-end built on the .NET ecosystem, and proven experience in CI/CD pipeline creation, automated builds, and production deployment. 2. Core Responsibilities Area Activities Back-End Development • Design and implement RESTful APIs using ASP.NET Core (≥ 6.0). or Nancy • Write clean, testable C# code • Manage data persistence (EF Core, Dapper, or similar). • Implement authentication/authorization (e.g., Azure AD, JWT). · Python knowledge or coding experience is Preferable Front-End Development • Build interactive UI with React (≥ 18) using TypeScript. • Integrate React components into a .NET-hosted SPA (e.g., ASP.NET Core MVC/ Razor Pages or the new .NET React template). • Apply responsive design, accessibility (WCAG 2.1 AA) and performance best-practices. Build & Release • Define and maintain CI pipelines (bitbucket, or similar). • Author build scripts (MSBuild, npm/yarn, Webpack) to produce versioned artefacts. • Configure automated unit, integration, and UI tests. • Set up CD pipelines for staging & production (Teamcity). Collaboration • Contribute to architectural discussions and code reviews. • Document APIs (Open/Swagger), deployment steps, and run-books. • Mentor junior team members on .NET/React best practices. 3. What we are looking for: We are looking for someone with a strong background in C# and React application development (preferably Python knowledge) This is a brand-new application in Fixed income ETF space, very ambitious project so the ideal candidate must be a self-starter who can take ownership from the ground up. The role requires building the entire development pipeline and taking the application all the way to production. The candidate should be familiar with server setup, deployment processes, and production environments. We are not just looking for someone who can handle individual JIRA tasks; we need a well-rounded developer who understands the full application lifecycle, from development through deployment and maintenance 4. Experience & Education Requirement Details Professional Experience ≥ 4 years of full-stack development with the above stack; at least 2 years delivering production-grade applications end-to-end. Education Bachelor’s degree in computer science, Engineering, or equivalent practical experience. Delivery Track Record Demonstrable experience setting up a complete build pipeline and deploying the first production release of a new application. Self starter.

RJC Group is partnered with one of our London based Energy Trading clients looking for a Full-Stack C# and Angular Developer. This will be an equal split between front and back end depending on the task. The role sits within their Applications Team in the Front Office. Role requirements: • 5+ Years of commercial C# experience, • 3+ Years of commercial Angular experience (ideally 17+), • Must have experience working in a trading environment (ideally commodities) This role is London based and Hybrid with salaries open to discussion. Sponsorship cannot be offered for this role.

Are you a talented, super-ambitious full-stack developer? Excited by building solutions to real-world challenges? Motivated by owning shares in a high-growth business? Want to join a team of smart, committed, and highly functioning professionals? This might be the role for you! The company… Our client is an ambitious, fast-growing EdTech disruptor. They exist to create a world where educators are liberated from administrative burdens and empowered to focus entirely on what matters most—nurturing the potential of every student. Their mission is to unify the fragmented landscape of school technology through intelligent, human-centred design. By replacing disconnected silo systems with one seamless platform, they restore joy to teaching, strengthen connections between schools and families, and empower students to take ownership of their learning journey. They partner with educators to build software that serves people, not the other way around. Schools are often stuck juggling siloed systems that don’t talk to each other, creating frustration, duplication, and wasted time. The team have lived that reality themselves, and it’s exactly what they set out to fix. They started by transforming how music departments are managed and quickly became the market leader. Now, they’re scaling that approach across schools more broadly, building tools that bring activities, communication, and data together into a single intuitive platform. Their distinctiveness lies in their world-class technical talent, producing elegant software solutions, a profound passion for education's transformative potential beyond the core curriculum, and their impatience with inefficient systems that hinder children's potential. They move fast, listen carefully to users, and value people who take initiative. The role… They’re hiring their second full-stack developer to work closely with their experienced Lead Developer and CPO to supercharge their development capacity. The role will involve quickly building and evolving areas of the platform, with a focus on customer success. This role is central to enhancing platform adoption, and to this end, the first few months will be spent working closely with schools to help onboard, train and increase adoption. The role comes with a high degree of ownership and will be rewarding for an individual who can proactively apply their technical prowess to adapt our platform to help customers. Key Responsibilities • Pursue excellence in rapid product development: Use all means at your disposal to write excellent code and increase value for the teachers, parents and students using the platform., • Pursue excellence in customer success: During the initial 3-month period, proactively increase platform adoption and engagement, ensuring customers fully leverage it to manage their school. Continue with this mindset as a full member of the product development team., • Team fit and agility: Engage in product and customer-focused discussions within the team, collaboratively solving puzzles and balancing needs between different priority areas., • Platform support: Provide technical support as needed, ensuring rapid, effective issue resolution to enhance satisfaction and drive platform adoption. This role is suited to someone seeking more than just a job. It is suited to someone who wants a stake in a business and is relentless in the pursuit of growth. The package • £60,000 salary, • A stake in the success of the company through share options, • Fast-growing company with plenty of room for progression, • 34-days holiday, including bank holidays., • Uncapped training and development budgets, • Vibrant team with regular socials, like pool, darts and drinks, • Team retreats, • Weekly lunches, • 6 monthly pay reviews, • Opportunity to work in a uniquely high-performance team - if you're impatient for progress, then we're the place you'll thrive, • Regular Mario Kart action! To be successful, you will… • Have experience with React / NodeJS, • Have expertise in Typescript/JavaScript, with proven experience in development role(s), • Have exceptional problem-solving abilities, proven in diagnosing and fixing complex technical issues, • Have excellent communication skills, able to foster strong customer relationships while bringing technical solutions, • Have a good understanding of software development practices, • Have a commitment to ongoing learning and adapting to new challenges in a dynamic environment Ideal, but not essential… • Experience with MongoDB, • Experience with AWS-style cloud platform architecture, • Knowledge of automated testing tools and frameworks, • Experience using AI tooling to amplify development output, • A passion for enhancing product user experience Apply! If you’re smart, incredibly driven, and want to build something big, apply now.

Senior .NET / React Developer - Global Markets Inside IR35 Contract Role - London - Up to £850 per day About the Role: We are currently seeking an experienced Senior .NET Developer to join a leading global financial institution in London. This is a 6-month contract with strong likelihood of extension, working on critical desktop applications within their Global Markets technology team. Key Responsibilities • Enhance and maintain two business-critical desktop applications:, • A desktop application launcher/management system built with WPF and .NET, • A background business alerting application that processes system events, • Develop new React admin screens as part of extending these applications to new business units, • Participate in architecture improvements to support broader deployment, • Work closely with a small, collaborative development team Technical Requirements • Strong experience with .NET development and React, • Familiarity with event processing systems and messaging architectures, • Ability to work across both frontend and backend development The Ideal Candidate Will Have • Strong understanding of event-driven architectures, • Experience with asynchronous programming and multi-threading, • Exposure to financial services applications (though deep domain knowledge is not required), • Ability to work independently in a small team environment Work Environment • Hybrid working arrangement: 50% office time (3 days one week, 2 days the next), • Small, collaborative team of 3 developers based in London Contract Details • Day rate: Up to £850 per day, • Duration: 6 months initial term with expected extensions, • Location: London office If you're an experienced .NET developer looking for a varied and technically challenging role within financial technology, we'd love to hear from you.

Senior Full‑Stack Engineer – FX e‑Trading – London Atrium EMEA is looking for several Senior Full‑Stack Engineer with good experience of FX e‑Trading (React/TypeScript + Java) to help architect and build a new FX e‑trading platform from the ground up, working across the stack to deliver high‑performance, resilient, and secure systems. You will partner closely with product, trading, and infrastructure teams to deliver features end‑to‑end—from UI and desktop container experiences to low‑latency backend services. Lean into the latest AI coding tools to accelerate delivery, strengthen code quality, and enhance developer experience. 4 days onsite in London. PAYE/Umbrella options. • Lead design and development of full‑stack features: React/TypeScript web apps, desktop container integrations (OpenFin or similar), and Java services., • Architect and implement scalable, event‑driven, and microservices‑based backend components (e.g., Spring Boot), including APIs, market data, order/risk workflows, and real‑time streaming., • Build performant and accessible UIs with modular, reusable components; drive state management, data visualization, and UX for trading workflows., • Optimize latency, throughput, and reliability across the stack; instrument observability (metrics, tracing, logging) and performance profiling., • Establish engineering best practices: code standards, testing strategies (unit/integration/E2E), CI/CD, secure coding, and release management., • Mentor engineers through code reviews, design sessions, and hands‑on pairing—encouraging thoughtful abstractions, clean architecture, and pragmatic delivery., • Use AI development tools for assisted coding, refactoring, test generation, secure code analysis, documentation, and knowledge search—evaluating where AI accelerates while maintaining human oversight., • Collaborate with stakeholders to translate trading requirements into robust technical designs; write clear specs and implementation plans. Essential: • Professional software engineering experience, with deep expertise in: Frontend: React, TypeScript, modern tooling (bundlers, linting, testing frameworks)., • Backend: Core Java, Spring Boot (or similar), multithreading/concurrency, performance tuning., • Experience designing and operating distributed systems (microservices, event‑driven architectures, messaging/streaming)., • Strong understanding of computer science fundamentals (data structures, algorithms, concurrency, networking, OS)., • Proven experience in e‑trading or real‑time financial systems (FX highly desirable), including familiarity with market data, order flows, and execution workflows., • Hands‑on with CI/CD, containerization, cloud/on‑prem deployments, and observability., • Comfort evaluating and integrating AI coding tools into daily development workflows., • Excellent communication and stakeholder engagement; able to lead initiatives and mentor others., • Experience with desktop container frameworks (OpenFin, Electron, or similar)., • Experience with streaming/messaging (e.g., Kafka, Solace) and low‑latency patterns., • Knowledge of web performance optimization and accessibility. Click Apply now/Contact Lianne to be considered for the Senior Full‑Stack Engineer – London role