Full Stack Engineer Jobs in London, UK

<div class="content-intro"><p>The world of digital assets is accelerating in speed, magnitude, and complexity, opening the door to new ways for leveraging the blockchain. Fireblocks’ platform and network provide the simplest and most secure way for companies to work with digital assets and it trusted by some of the largest financial institutions, banks, globally-recognized brands, and Web3 companies in the world, including BNY Mellon, BNP Paribas, ANZ Bank, Revolut, and thousands more. </p></div><p><strong>About Fireblocks</strong></p> <p>Fireblocks is on a mission to enable every business to easily and securely access digital assets and cryptocurrencies. As a leading provider in the digital asset space, we are committed to fostering a diverse and inclusive workforce that mirrors the global clientele we serve.</p> <p><strong>About the Team</strong></p> <p>The FinApps Access team at Fireblocks builds the backbone of on-chain access for some of the world's largest financial institutions and crypto-native organizations. We operate at the intersection of blockchain protocol engineering and enterprise-grade reliability — designing systems that route, protect, and optimize transactions across dozens of chains at scale.</p> <p>You'll work on mission-critical infrastructure powering DeFi connectivity, multi-chain integrations, transaction execution pipelines, and on-chain data access — with direct impact on how billions of dollars flow through decentralized networks every day.</p> <p><strong>What You'll Do</strong></p> <ul> <li>Design and build robust, scalable backend services supporting high-volume on-chain transaction flows across multiple blockchain networks — both EVM and non-EVM.</li> <li>Own end-to-end development of backend components and APIs — from architecture decisions to production deployment.</li> <li>Lead integrations with DeFi protocols, on-chain data sources, and blockchain nodes across a wide range of chains and ecosystems.</li> <li>Research and evaluate emerging blockchain technologies, protocols, and standards to keep Fireblocks at the cutting edge.</li> <li>Optimize existing production systems for performance, reliability, and security — reducing latency and increasing throughput.</li> <li>Collaborate closely with product, protocol research, and platform engineering teams to deliver high-quality solutions on time.</li> <li>Drive features from inception through to delivery at scale, taking full ownership of the product lifecycle.</li> </ul> <p><strong>What You'll Bring</strong></p> <ul> <li>7+ years of experience as a Backend or Full Stack Engineer.</li> <li>Bachelor of Science (B.Sc.) or equivalent degree/experience.</li>

We are looking for a systems-thinking Senior Full-Stack AI Engineer to bridge the gap between advanced AI orchestrations and seamless user experiences. In this role, you will design and build production-grade multi-agent systems and stateful workflows while crafting the responsive, intuitive frontends needed to interact with them. You won't just be plugging in basic LLM wrappers. You will be architecting complex, deterministic AI engines, exposi...

Senior Full stack Engineer 80,000 - 120,000 Hybrid - London (3x days per week) This is a high impact engineering role within a small, specialist team responsible for accelerating product development across a growing data organisation. You will work at the cutting edge of AI-enabled engineering, building prototypes, tools, and platform components that turn complex data into usable products at speed. If you enjoy autonomy, rapid delivery, and solv...

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...

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...

Lead Full Stack Engineer (C#, .Net, Angular) Central London (Hybrid) Up to 125,000 + Benefits Help Build the Next FinTech Success Story We're partnering with an ambitious fintech startup that's entering an exciting phase of growth, and they're looking for a Lead Full Stack Engineer to help shape the future of both the technology and the engineering team. This isn't a role where you'll inherit legacy processes and simply keep the lights on. You'l...

Full Stack Engineer (Python/React.js) -Vietnam This role is based in Vietnam and we are looking for local candidates based in Ho Chi Minh City. This is an outstanding opening to become the head of development or future CTO. This is a Perm role In partnership with Robert Half Ltd and Tony Koyratty Location: Ho Chi Minh City, Vietnam (Work Pattern 2 days in office and 3 days from home) Candidates must be able to live in work and travel to central ...

Full Stack Engineer - Azure, C#, .Net, React / ReactJS Outside IR35 12 Month Contract Fully Remote (UK only) 375 - 425 Per Day We're currently working with a London based MedTech company who are searching for a Full Stack Engineer who has extensive experience working with Azure, C#, .Net and React / ReactJS. This project will see you working alongside a small existing team of developers, adding additional capacity to make business critical updat...