staff java backend developer jobs in London

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...

Every dataset at Spotify, from the data behind creator royalties to the signals powering recommendations, is registered, published and traced through systems our team builds. We're the source of truth for what data exists at Spotify, where it lives, who owns it, and how it flows from one pipeline to the next. These systems sit on the critical path of the...

A World-Changing Company   Palantir builds the world’s leading software for data-driven decisions and operations. By bringing the right data to the people who need it, our platforms empower our partners to develop lifesaving drugs, forecast supply chain disruptions, locate missing children, and more.The Role   Backend Software Engineers at Palantir build...

Who we are Helsing is a defence AI company. Our mission is to protect our democracies. We aim to achieve technological leadership, so that open societies can continue to make sovereign decisions and control their ethical standards.  As democracies, we believe we have a special responsibility to be thoughtful about the development and deployment of powerful...

Location: London (Hybrid) | Practice Area: Technology & Engineering | Type: PermanentPower the platforms behind modern finance. Shape cloud-native solutions with Java at their core.The RoleWe’re seeking a Senior Backend Engineer (Java) to join our Technology & Engineering team. You’ll bring expertise in building robust, scalable, cloud-native...

Title: Founding Staff Engineer (Agentic Systems & AI Infrastructure) at MelowLocation: Remote Europe (London preferably) | Full-Time | Founding TeamSalary: up to $130k base + 1% equity Build the Future of AI InfrastructureKey Skills Python AI concepts Data Strategy Building scalable systems Cloud Security Data Science Working with large quantities of...

Staff Backend Engineer (Go Lang) About the Opportunity: MateHR is currently seeking a highly experienced Staff Backend Engineer on behalf of one of our most ambitious clients rapidly scaling fintech startup that's reshaping global transaction services. This exciting organisation is quickly expanding its presence internationally, notably making significant...

Job Description Staff Product Engineer | London Hybrid / Remote | AI x FinTech | Python, AI Workflows, Distributed Systems | £120k–£200k + Equity A VC-backed AI company is rebuilding how accounting work gets done, using agentic workflows and AI automation to eliminate the high-volume operational work that has resisted meaningful automation for decades....

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process. If you're interested sign up to Dex to apply. Dex is an AI recruiter agent that...

Wise London is building an Account Insights team and seeks a backend engineer to own end-to-end features like spending summaries and spend controls. You’ll work across a high-throughput stack (Java/Spring Boot, Kafka) to turn millions of transactions into clear, actionable insights.You’ll own components from development to production, collaborate with...

Webologix Ltd/ INC is looking for a Mid-Senior Java Developer in Greater London to join our engineering team. You will build robust backend systems, design RESTful services, and contribute to scalable microservices while upholding code quality and best practices.You\'ll work on end-to-end real-world projects, collaborating with product and QA, solving...

Senior/Staff Engineer - React$180,000 - $280,000 + equityRemoteMarketplace ApplicationHowrecruit has been retained to manage the search for a Senior Product Engineer on behalf of a profitable, bootstrapped e-marketplace start-up in the services space. This is a rare opportunity to shape a widely-used, customer-facing platform by working in a lean,...

Synthesia is the world’s leading AI video platform for business, used by over 90% of the Fortune 100. Founded in 2017, the company is headquartered in London, with offices and teams across Europe and the US. As AI continues to shape the way we live and work, Synthesia develops products to enhance visual communication and enterprise skill development,...

Location: UK (Hybrid / Onsite as required) Experience: 2–5 years Role Type: Fixed Term Contract Overview We are building a modern Data Fabric platform that enables the ingestion, transformation, and serving of large volumes of data as high‑quality, reusable data products for analytics, reporting, and operational use cases. The platform operates across...

Job DescriptionMy client, a startup in London, is looking for a Lead Software Engineer (Backend Platform Services). For full details, please apply.At A Minimum, We Would Expect -Enthusiasm for developing technologies to solve real problems -Demonstrable coding skills -Confidence to challenge our engineering customs and practices -Overwhelming desire to ‘do...

CoreWeave is The Essential Cloud for AI™. Built for pioneers by pioneers, CoreWeave delivers a platform of technology, tools, and teams that enables innovators to build and scale AI with confidence. Trusted by leading AI labs, startups, and global enterprises, CoreWeave combines superior infrastructure performance with deep technical expertise to...

Remote · Full Time · Individual Contributor · +8 Years of Experience Staff Engineer, Trust & Vault Who We Are Yuno is the AI-native operating system of global commerce, powering the financial infrastructure of enterprise merchants, banks, and wallets. Through a single API, Yuno connects them to pay-ins, payouts, fraud prevention, KYC/KYB, and stablecoins...

About Us:Based in San Francisco, California, Turing is the world’s leading research accelerator for frontier AI labs and a trusted partner for global enterprises deploying advanced AI systems. Turing supports customers in two ways: first, by accelerating frontier research with high-quality data, advanced training pipelines, plus top AI researchers who...

Junior Java Support Analyst About the job The Global Markets IT department delivers secure, scalable, and innovative technology solutions across the bank's global operations. The team supports business users across trading, risk, operations, finance, and other functions. We are looking for an Junior Java Support Analyst to join the team. This role is...

Lead Java Engineer - London Reference Code: -en_GBContract Type:PermanentProfessional Communities: Software EngineeringJob Title: Lead Java Engineer Location: London About the Job you are considering: Join Capgeminis Cloud & Custom Applications (C&CA) practice within the Financial Services business, where we help clients solve complex challenges...