Full Stack Engineer Jobs in London, UK

<div class="content-intro"><p>Ebury helps ambitious businesses unlock global growth, and we take the same approach with our people. We encourage innovation and movement, collaboration and problem-solving, and foster an environment where everyone can feel they belong, are valued, supported and empowered to succeed.</p> <p>If you’re a collaborator who wants to help transform how businesses operate globally, get in touch - we’d love to discuss how Ebury can accelerate your career so you can shape the future.</p></div><p><span style="text-decoration: underline;"><strong>Senior Fullstack Engineer (Business Cards)</strong></span></p> <p><span style="text-decoration: underline;">London Office - Hybrid: 4 days in the office, 1 day working from home</span></p> <p>We're looking for a Senior Fullstack Engineer to join our new, rapidly growing Cards team. In this role, you'll work on innovative fintech products, helping to solve customer problems by leveraging data and an entrepreneurial spirit. We're looking for someone who is ever-curious and passionate about continuous learning, who can identify and use the right tools for the job, regardless of language or framework.</p> <p><strong>What We Offer:</strong></p> <ul> <li>Competitive salary and benefits package.</li> <li>Opportunities for professional growth in a leading European fintech company.</li> <li>High ownership and visibility on a critical business initiative.</li> <li>A collaborative, open, and dynamic environment.</li> <li>The chance to shape how global businesses connect with Ebury.</li> </ul> <p><strong>Responsibilities:</strong></p> <ul> <li>Lead the design and delivery of complex features for customer-facing web applications.</li> <li>Experience in FinTech, banking, or another closely related sector, with a strong understanding of financial systems and building within a regulated environment.</li> <li>Drive frontend development using React/VueJS and backend development with Python.</li> <li>Collaborate with data engineers to design, build, and optimize robust data pipelines for analytics and machine learning.</li> <li>Own the full product lifecycle, including development, maintenance, monitoring, and alerting.</li> <li>Mentor junior engineers and champion technical excellence.</li> <li>Collaborate cross-functionally to deliver impactful solutions.</li> <li>Contribute to the technical roadmap, identifying opportunities for innovation.</li> <li>Ensure code is testable with good test coverage.</li> <li>Stay up-to-date with emerging technologies.</li> <li>This position may require being on-call at times

<div class="content-intro"><p>Ebury helps ambitious businesses unlock global growth, and we take the same approach with our people. We encourage innovation and movement, collaboration and problem-solving, and foster an environment where everyone can feel they belong, are valued, supported and empowered to succeed.</p> <p>If you’re a collaborator who wants to help transform how businesses operate globally, get in touch - we’d love to discuss how Ebury can accelerate your career so you can shape the future.</p></div> <h1 data-path-to-node="4">Senior Full-Stack Engineer — Flow (AI Agent Platform)</h1> <p data-path-to-node="5"><strong data-path-to-node="5" data-index-in-node="0">Location:</strong> London Victoria Office</p> <p data-path-to-node="6"><strong data-path-to-node="6" data-index-in-node="0">Work Pattern:</strong> Hybrid (4 days office, 1 day remote)</p> <p data-path-to-node="7"><strong data-path-to-node="7" data-index-in-node="0">Team:</strong> Flow (Core AI Infrastructure)</p> <h2 data-path-to-node="9">About the Role</h2> <p data-path-to-node="10"><strong data-path-to-node="10" data-index-in-node="0">Flow</strong> is our internal AI agent platform. This isn't a basic chatbot bolted onto a help center; it is core agentic infrastructure that reaches across our data warehouse, services, and central systems to execute complex work on behalf of the business. Flow powers both internal and client-facing workflows, delivering true automation and replacing traditional ticketing queues with instant, intelligent actions.</p> <p data-path-to-node="11">We are looking for a <strong data-path-to-node="11" data-index-in-node="21">Senior Full-Stack Engineer</strong> to help us transition Flow from a fast-moving internal product to durable, productionized platform infrastructure. You will own complex features end-to-end—including agent workflows, reasoning UIs, and cross-system integrations—while raising the engineering bar and shaping the technical direction of a small, autonomous team.</p> <p data-path-to-node="12">This role sits at the intersection of agentic AI and live operational workflows within a regulated fintech environment. The surface area is the entire company, and your impact will be visible within weeks.</p> <h2 data-path-to-node="14">What You'll Do</h2> <ul data-path-to-node="15"> <li> <p data-path-to-node="15,0,0"><strong data-path-to-node="15,0,0" data-index-in-node="0">Build Action-Oriented Agent Workflows:</strong> Design multi-step orchestration, tool use, and ret

⚡ About Amber Amber is an entirely new way of thinking about buying, banking and selling energy where home energy technology works to put money back in customers’ pockets and accelerate the renewable energy transition. We’re an Australian headquartered company, where we are both an energy technology company and a utility providing energy directly to households and small businesses. In Australia (the world leader on rooftop solar and a 2-way energy grid), we’ve proven that the cheapest, fastest and most rewarding way to reach 100% renewables is to automate the growing wave of home batteries, EVs, and other smart energy devices. Customers get direct access to the real-time electricity prices and the technology to shift energy usage to the times when cheaper renewables are available in the grid and export to the grid at times when the price they can be paid for it is highest. We are a clear market leader in energy automation in Australia, and are now partnering with utilities across Europe to bring our technology to European markets and consumers. We’re at a critical moment in taking the business to scale in Europe. You’ll be joining a rapidly growing regional team of 15, and be part of a global team of over 220, with expertise across energy, technology, marketing, and operations. We’re committed to building a diverse and inclusive workplace and a great culture of people who love coming to work to build a better world. We’re backed by leading VCs in Australia and Europe, as well as impact-focused investors and world-leading energy companies. 💻 About the role At Amber, we believe that enabling a culture where everyone is set up to do the best work of their lives, and feels connected and supported, is one of the most important things we can do to ensure our long-term success. Want to help improve the environment by shifting the world’s energy usage towards renewables? We are currently hiring for a Full Stack Software Engineer. Amber provides a great opportunity to apply your skills as an Engineer to help enable the uptake of renewable energy. Our technology optimises thousands of batteries and other devices in the customers' homes, enabling them to time their usage to consume power at times of high renewable penetration (and cheap prices), and then export power back to the grid at critical times - letting them outbid energy generators and earn potentially >£50 in an afternoon. The Amber Electric product team develops and supports: Home automation integrations (to batteries, hot water systems and pool pumps, with EVs coming soon) that control electricity usage in response to pricing and renewable availability Mobile & Web apps for customers to monitor and manage their energy usage A pricing and billing engine for real time energy pricing The tech stack is React Native mobile app, some React web frontends, and a Serverless Lambda backend on AWS. We’re using Typescript top to bottom, and Apollo GraphQL sits in the middle. We keep our data in DynamoDB, Postgres, and Snowflake, using one or the other as best suits a particular workload. You can learn more about our tech stack athttps://stackshare.io/companies/amber-electric While we’re looking for talented and driven individuals our desire is to build a champion team, not a team of champions. We’re full-stack-ish; while it’s impossible for everyone to excel across every layer of the stack we value people who can chip in wherever they’re needed. We’re committed to building a diverse and inclusive workplace from the ground up. We want engineers who are as comfortable communicating with people as they are with their code.

Build and deliver the next generation of privacy-first analytics capabilities — from rapid prototypes and AI-powered insights to scalable product innovations embedded directly into Matomo’s core platform. Own end-to-end innovation development within a small, autonomous team, working closely with the CTO and senior engineers to turn high-impact concepts into practical, production-ready solutions.

Full Stack Engineer at 9fin. Apply via Ashby.

Staff Full Stack Engineer at Capimoney. Apply via Ashby.

  Role Mission From day one, you will be given the opportunity to engage directly with clients including CEO’s and co-founders to understand their needs and deliver bespoke solutions.  You’ll dive straight into hands-on learning, guided by experienced developers who will mentor you and set you up to manage your own projects.  As you grow, you’ll take on more responsibility, mentor junior developers and become an essential technical advisor within your team.  You’ll thrive on solving complex problems, continuously expanding your technical skills and tackling new challenges.    You will work as a Full Stack Developer working on creating innovative web and mobile applications for our clients, working as part of a small, dynamic team of developers.  You’ll collaborate closely with agile and technical coaches to build scalable solutions using cutting edge technologies.    Skills  * React.JS or React Native  * Node.Js (javascript/Typescript) or Python Proven * Ability to work directly with stakeholders  * Strong communication skills and comfortable working in cross-functional teams  * Stem or Computer Science Degree or comparative experience    Advantageous Skills * Nest.js * AWS  * Expo  * Experience working in an Agile environment    What we Offer  Alongside a competitive salary, we also offer:    * 25 Days annual leave  * Learning and Development Support throughout your career at Theodo  * Private Health Insure Via Vitality  * 3 week work from anywhere policy   * Equipment budget for your tech set up * Company pension  * Monthly Socials * A Slack network of 600+ engineers across our extended ecosystem — ask questions, share patterns, or troubleshoot obscure bugs with some of the sharpest devs out there. * You'll work on a hybrid basis from our office based in London.    Who are we  Theodo UK is a software consultancy specialising in full-stack development, mobile and web applications and cloud solutions.   We are a 70-person team based in the UK and South Africa, and we’re growing quickly.Theodo UK operates with the entrepreneurial drive, agility and ownership mindset of a start-up, but with the financial stability, global reputation and technical depth of the wider Theodo Group behind us. This unique position allows our team to innovate quickly, take smart risks, and build real value for clients—without compromising on quality. We follow Lean and Kaizen principles to continuously improve and deliver high-quality digital products at speed.   While headquartered in the UK, our reach is global. Supported by our South African team, we manage projects across English-speaking markets worldwide.   Values  Team Spirit  Our team has a natural ability to work together to achieve a common goal.  Taking on the role of a good teammate requires courage; it means challenging and giving each other feedback. Its key to our teams succeeding  Pragmatism  Achieving effective results by utilising resources efficiently and avoiding unnecessary waste of time, energy and money.  Emphasising agile practives, employing concise and direct interactions and engaging in firsthand experiences to challenge beliefs  Willingness to Improve  Actively identifying areas for improvement rather that tolerating good enough, promptly learning from problems and embracing challenges outside of one’s comfort sone.  These are all skills we promote in our team to benefit themselves, fellow Theodoers, Theodo and the wider community

Spotify for Authors (SFA) is the creator platform for the audiobook industry — a web application that gives publishers, authors, and narrators tools to manage their catalog, track performance, and distribute content on Spotify. We're scaling toward 100,000 users across a React/TypeScript frontend, Java backend services, and data pipelines that feed into Spotify's broader audiobook ecosystem. SFA connects to Spotify's highest-priority bets: expanding audiobook access, building content creation tools, and shaping discovery surfaces. We operate with a "short toes" philosophy — contribution has no borders, quality is shared, and we use modern tools (including AI) to reduce toil and amplify creativity.

Spotify for Authors (SFA) is the creator platform for the audiobook industry — a web application that gives publishers, authors, and narrators tools to manage their catalog, track   performance, and distribute content on Spotify. We're scaling toward 100,000 users across a React/TypeScript frontend, Java backend services, and data pipelines that feed into Spotify's   broader audiobook ecosystem. SFA connects to Spotify's highest-priority bets: expanding audiobook access, building content creation tools, and shaping discovery surfaces. We operate with a "short toes" philosophy —   contribution has no borders, quality is shared, and we use modern tools (including AI) to reduce toil and amplify creativity.

Every great song has a story behind it: a sample flipped into something new, a melody borrowed and reborn, a classic reinterpreted for a new generation. WhoSampled is where those stories live. WhoSampled is the world's leading database of music samples, interpolations, cover songs, and remixes. Built over more than a decade by a passionate community of over 40,000 contributors, and verified by a dedicated team of moderators, it's become the definitive archive of music's creative lineage — visited by millions of fans each year. In late 2025, WhoSampled joined Spotify, powering SongDNA: a new experience that lets listeners explore the samples, covers, and interpolations woven into the music they love. We're a small team with an outsized impact, and we're growing. As a Senior Fullstack Engineer, you'll be one of the first engineering hires into this team — a genuine opportunity to shape how WhoSampled evolves as a standalone product and as a foundational layer within Spotify's ecosystem. As a small team, our work spans across the stack: you’ll work as much on data pipelines and backend APIs as you will on our web app. The ideal candidate is a generalist at heart — someone who's equally at home writing a Django view, tuning a PostgreSQL query, or shipping a UI improvement, and someone who gets results without waiting for someone else to own adjacent layers.

Principal Full Stack Engineer & Architecture Lead, Great Company going through massive growth. London (Hybrid) 100,000- 110,000 + Benefits Command Recruitment is proud to be partnering with an ambitious and rapidly growing healthcare company that is transforming access to specialist healthcare services across the UK. Expected to hit 180M T/O this year from a start only 3 Years ago! This is the time to join this fast-moving and Growing Busine...

Principal Full Stack Engineer & Architecture Lead London (Hybrid) 80,000 - 90,000 + Benefits Command Recruitment is proud to be partnering with an ambitious and rapidly growing healthcare company that is transforming access to specialist healthcare services across the UK. This is a fantastic opportunity for an experienced Principal Engineer or Technical Architecture Lead to play a key role in shaping a modern, cloud-native healthcare platfor...

Full Stack Engineer at Unity advisory. Apply via Ashby.

City of London Permanent, Full-time - Onsite Who we are We are an energy trading company generating liquidity across global commodities markets. We combine deep trading expertise with proprietary technology and the power of data science to be the best-in-class. Our understanding of volatile, data-intensive markets is a key part of our edge. At Dare, you will be joining a team of ambitious individuals who challenge themselves and each other. We h...

Discover your future at Citi Working at Citi is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At Citi, you'll have the opportunity to grow your career, give back to your community and make a real impact. Job Overview Are you looking for a career move that will put you at the heart of a global financial institution? We are seeking a talented and passionate Senior Engin...

Senior Full Stack Engineer (Python / React) Fast-Growing Sports AI Company KEY POINTS Hybrid role based in London Build real time, data rich web applications for the sports industry Full ownership of the stack, from Next.js front end to Python back end Small, fast-moving team with high ownership and real impact Stack flexible, as long as you are happy in Python, FastAPI and React Salary up to 100,000 depending on experience Ideally a genuine spo...