52 senior software developer jobs in London

DXC Luxoft Financial Services is partnering with a leading UK financial institution to deliver cutting-edge Digital Asset and Web3 solutions. We're looking for an experienced Senior Blockchain Developer to help design and build enterprise-grade digital asset platforms, working at the intersection of traditional finance and blockchain technology. This is an opportunity to contribute to tokenization, digital custody, smart contracts, and next-generation financial infrastructure within a highly collaborative global team. Key Responsibilities • Design, build and deploy Web3 components including smart contracts, wallet integrations, protocol connectors and event listeners • Develop backend services using Java/Spring and Node.js to integrate with public and permissioned blockchain networks • Write, test and optimise Solidity smart contracts with a focus on security, reliability and gas efficiency • Build event-driven solutions to manage transaction lifecycles, on-chain events and...

About Freetrade Freetrade’s mission is to become the default place to invest. Investing has been too complicated and expensive for too long, keeping millions from making the most of their savings. We’re changing that. We’re building our team and looking for people who are excited to reshape how our customers invest and grow their wealth. If you’re driven by solving complex problems and building innovative products, you’ll fit right in. 2026 is a big year for us. Last year, we announced a game changing deal to become part of the IG Group. We’ll continue to operate as an independent business while gaining access to the resources and support of an established leader in the space. This year, we’re accelerating our roadmap and taking our products to the next level. We’re building new features like mutual funds, bonds, and family investment tools. We’re also exploring how we can leverage AI to deliver an even better experience for our customers. Why Join Our Engineering Team?...

Our LINQ platform is the software that plans, schedules, and drives life-science labs. Our clients run labs for cancer diagnostics, drug discovery, cell manufacturing, synthetic biology and more. This role owns the interface to the lab — not just the UI, but every surface someone builds on or acts through: the app a scientist touches, the APIs and SDK an integrator builds on, the CLI an engineer scripts with, the agent surface a model acts through. Most product interfaces are forms over a database. Ours front a physical world that changes by itself — robots act, schedules change, instruments fail — and every one of those surfaces has to keep its user genuinely in control. We're building the next generation of our interfaces — AI-native from the ground up: personalised to role and behaviour, UI generated on the fly where it earns its place, and agents working in the product alongside the people using it. This is a role for someone user-obsessed — the platform underneath is...

Since we opened our doors in 2009, the world of commerce has evolved immensely, and so has Square. After enabling anyone to take payments and never miss a sale, we saw sellers stymied by disparate, outmoded products and tools that wouldn’t work together. So we expanded into software and started building integrated, omnichannel solutions – to help sellers sell online, manage inventory, offer buy now, pay later functionality, book appointments, engage loyal buyers, and hire and pay staff. Across it all, we’ve embedded financial services tools at the point of sale, so merchants can access a business loan and manage their cash flow in one place. Afterpay furthers our goal to provide omnichannel tools that unlock meaningful value and growth, enabling sellers to capture the next generation shopper, increase order sizes, and compete at a larger scale. Today, we are a partner to sellers of all sizes – large, enterprise-scale businesses with complex operations,...

LMAX Group is looking for a highly skilled and passionate Data Operations Engineer/Developer to join our team and help build and scale our data processing infrastructure. In this role, you'll develop high-performance data pipelines, real-time streaming systems, and robust data architectures that power LMAX's growth and Business Intelligence initiatives. You will work with the wider technology and business teams to continuously improve the quality of data that drives our decision making within the Forex and digital currency trading and custody solutions. This role is ideally suited to a senior-level engineer, but we are more than willing to help a driven mid-level engineer grow into the position. About You You are comfortable architecting, building and supporting end-to-end solutions that are practical and performant. Throughout your career, you have developed a broad set of knowledge and skills and are comfortable wearing different hats. You have acquired the know-how around...

CMC Markets is seeking a Senior Low Latency Java Developer to join our Quantitative Strategies team within Pricing & Risk, working on our high-performance, high-frequency trading platform. This is a hands-on role at the core of our market-making technology stack, where nanoseconds matter and engineering excellence is critical. You’ll design and build ultra-low latency pricing and risk systems that directly power our global trading operations. If you thrive in performance critical environments and want your work to have real market impact, we would love to hear from you. Please note that this is an onsite role that will require you to work within our London office (near Liverpool street) 5 days on site per week. The Role Ultra-Low Latency Engineering Develop and optimise high-performance Java (21+) systems for pricing, risk and trading. Build and enhance components within a low latency, high-throughput trading architecture. Apply advanced concurrency, memory...

Who We Are: Alpaca is a US-headquartered, global leader in agent-first brokerage infrastructure for stocks, ETFs, options, crypto, fixed income, 24/5 trading, and more. Amongst our subsidiaries, Alpaca is a licensed financial services company, serving hundreds of financial institutions across 40 countries with our institutional-grade APIs. This includes broker-dealers, investment advisors, wealth managers, hedge funds, and crypto exchanges, totalling over 10 million brokerage accounts. Our global team is a diverse group of experienced engineers, traders, and brokerage professionals who are working to achieve our mission of opening financial services to everyone on the planet. We're deeply committed to open-source contributions and fostering a vibrant community, continuously enhancing our award-winning, developer-friendly API and the robust infrastructure behind it. Alpaca is proudly backed by $400 million in funding from top-tier global investors including Portage Ventures,...

Blockchain is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in 2011, Blockchain has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions. We are looking for a Head of Site Reliability Engineering (SRE) who will serve as the principal leader in developing and executing our infrastructure reliability strategy that scales with the company as it continues to grow. You will join an exceptional crypto company and senior engineering management team at a time of high growth. This is a tremendous opportunity for a leader to enhance and shape the infrastructure vision at a high-growth crypto financial services company. You will know how to navigate complex organizations to build relationships, deliver results, and understand the macro environment...

About Us ClearBank was built on the belief that banking infrastructure should unlock progress, not slow it down. Our clients — from fintechs and crypto platforms to banks and credit unions — use our API to power their banking infrastructure. Our people power our technology and shape the way we work. We are a group of ambitious, collaborative people who challenge the norm and believe in fairness, autonomy and choice. We empower people with the tools to learn, grow and contribute to our clients’ success. About The Role You’ll join the Developer Experience team as a Senior AI Enablement Engineer, helping shape how ClearBank adopts, governs and measures AI across software engineering at scale. This role is for someone who can operate beyond individual tool usage and help define the platform, practices and controls needed for responsible AI-enabled engineering. You will work across multiple engineering teams to turn AI experimentation into scalable...

Elliptic has helped trace and disrupt over $21.8 billion in illicit crypto laundered across blockchains, from sanctioned nation states to organized crime networks hiding funds through token swaps and unregulated exchanges. It’s how compliance and investigations teams fight back, tracking and screening transactions with 99% market coverage. The infrastructure behind all of this needs to be as resilient and sharp as the intelligence it delivers. We are looking for a Senior DevOps Engineer with a strong background in DevOps and extensive hands-on experience with Kubernetes, someone who thrives on taking ownership, driving initiatives from concept to delivery, making informed decisions, and proactively improving systems and processes. You’ll play a key role in shaping our platform strategy, collaborating with talented engineers, and fostering a culture of reliability, security, and efficiency. The Impact You Will Have You will have a transformative impact across Ellitpic by...

Thought Machine's mission is bold – to properly and permanently rid the world's banks of legacy technology. To achieve this, we have developed the foundations of modern banking through core and payments technology which run natively in the cloud. What we are attempting is hard and means we need great people working together to build great technology. We have grown rapidly in the past few years – growing our team to more than 550 individuals across offices in London, New York, Singapore, Sydney and our newly established Engineering Hub in Lisbon. We have raised more than £500m in funding and our investors include Molten Ventures, Eurazeo, Intesa Sanpaolo, Temasek, Nyca Partners, JPMorgan Chase Strategic Investments, Standard Chartered Ventures, and more. We have created a culture that enables our team to produce the best work in the industry while ensuring we have fun along the way. We're regularly cited as having a fantastic workplace culture and have been recognised by Sifted...

Company Description Experian is a global data and technology company, powering opportunities for people and businesses around the world. We operate across a range of markets, from financial services to healthcare, automotive, agribusiness, insurance, and many more. Experian invests in people and new advanced technologies to unlock the power of data. We have an amazing team of 25,200 people in 32 countries. Job Description Experian Consumer Services helps millions of UK consumers understand and improve their financial lives. Credit scores, subscriptions, and marketplace products are the core of what we do today. New Growth exists to build what comes next: new revenue streams and propositions that turn ECS from a credit-score app into a broader financial wellbeing platform. We're looking for a Product Manager – New Bets to be part of that mission. You will report to the Head of Product, New Growth, you will be shaping the strategy, running experiments, and shipping the...

LMAX Group is looking for a highly skilled and passionate Data Operations Engineer/Developer to join our team and help build and scale our data processing infrastructure. In this role, you'll develop high-performance data pipelines, real-time streaming systems, and robust data architectures that power LMAX's growth and Business Intelligence initiatives. You will work with the wider technology and business teams to continuously improve the quality of data that drives our decision making within the Forex and digital currency trading and custody solutions. This role is ideally suited to a senior-level engineer, but we are more than willing to help a driven mid-level engineer grow into the position. About You You are comfortable architecting, building and supporting end-to-end solutions that are practical and performant. Throughout your career, you have developed a broad set of knowledge and skills and are comfortable wearing different hats. You have acquired the know-how around...

Blockchain is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in 2011, Blockchain has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions. You will operate the Product Security programe for Blockchain.com’s internally-developed products across Consumer, OTC and MRE lines. This is a senior, hands-on role: you’ll design and run the secure development lifecycle, lead threat modeling and architecture review, own the security debt lifecycle for product engineering teams, and architect the automated pipelines that protect billions in transaction volume. You will embed with product and engineering teams, convert technical findings into business-prioritized remediation, and lift developer capabilities so security is delivered by code...

Blockchain is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in 2011, Blockchain has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions. We are looking for a Infrastructure Security Engineer with a proven track record in keeping systems safe. You will play a critical role in building and providing tooling that monitors our entire stack, from supporting our consumer-facing products and our institutional offerings to ensuring that we are capable of rapidly responding to cyber attacks on our colleagues and endpoints. Throughout our company, Security is a well-established mindset that leverages novel engineering approaches - as a Senior Infrastructure Security Engineer, you will lead by example and drive technical discussions with...

LMAX Group is looking for a highly skilled and passionate Data Operations Engineer/Developer to join our team and help build and scale our data processing infrastructure. In this role, you'll develop high-performance data pipelines, real-time streaming systems, and robust data architectures that power LMAX's growth and Business Intelligence initiatives. You will work with the wider technology and business teams to continuously improve the quality of data that drives our decision making within the Forex and digital currency trading and custody solutions. This role is ideally suited to a senior-level engineer, but we are more than willing to help a driven mid-level engineer grow into the position. About You You are comfortable architecting, building and supporting end-to-end solutions that are practical and performant. Throughout your career, you have developed a broad set of knowledge and skills and are comfortable wearing different hats. You have acquired the know-how around...

About Us ClearBank was built on the belief that banking infrastructure would no longer slow down progress. Instead, it’s the catalyst that unlocks the potential to innovate. That’s why our clients — financial institutions from fintechs and crypto platforms, to banks and credit unions — use our API to power their banking infrastructure. But we wouldn’t be ClearBank without our people. They’re what powers our innovative technology and the reason we love what we do every day. We’re a group of spirited people who are never afraid to challenge the norm – becoming stronger, more energised, and that much better when we’re together. It’s our belief in fairness, autonomy and choice that means our people are empowered with the tools to learn, grow, and contribute to ours and our clients’ success. Interested in joining us? Read on or visit our website for more information. About You You’ll be joining the Developer Experience team as an AI Enablement Engineer. Reporting to the...

LMAX is renowned for its high-performance, ultra-low latency (we measure in microseconds) exchange written in core Java. We constantly push technology further than most, especially in our greenfield projects, driving the financial industry in new directions. Developers are encouraged to constantly develop and learn new skills. Pair programming supports continual growth of knowledge and sharing of expertise, alongside regular team rotations ensuring everyone gains first-hand knowledge on all areas of our codebase. Friday afternoons are set aside as personal development time where you can explore a different coding language, research bleeding edge technologies, or play around with one of our environments. There is also regularly scheduled time to improve developer experience and reduce technical debt - directed by developers. Our continuous integration and testing culture allows us to have confidence in our builds and develop quickly. We have over 30,000 acceptance tests running...

Role Overview The Director of Engineering – UK Payments will provide senior technology leadership for ClearBank’s UK-focused payments capabilities, owning the technical strategy, delivery oversight, and evolution of this domain, providing a highly utilised and relied upon set of capabilities for clients. This role will lead an established set of teams as they evolve payments capabilities to scale and meet developing client needs. The Director will collaborate closely with Product partners to shape the long‑term roadmap, ensure robust technical foundations, and guide ClearBank’s progression in this vital domain. Key Responsibilities Strategic Leadership Own the technology strategy for UK Payments, ensuring alignment with ClearBank’s wider platform and technology strategy. Partner with the Head of Product for UK to define and evolve a clear, credible roadmap covering near‑term delivery and longer‑term technical direction. Provide domain leadership and technical...