staff java backend developer jobs in London

About Millennium Millennium is a global, diversified alternative investment firm, founded in 1989. Defined by evolution, innovation and focus, Millennium’s mission is to deliver results for our investors. Our people are empowered with both independence and support: the autonomy to pursue ideas with conviction and the backing of a global network committed...

Job Summary We are looking for a UK based Staff Backend Engineer to be a key technical leader within the teams responsible for Depop’s Payments and Fulfilment systems, ensuring we provide our users with a best‑in‑class payments and shipping experience. You should feel equally at home around a whiteboard with a group of engineers, as you are explaining...

Senior / Staff Backend Engineer | £120k - £140k + equity | LondonFinding somewhere to live should be exciting. The experience of actually finding it often isn't.Techmunity are exclusively hiring for a London startup that raised a £2M seed round to build a video-first property platform.Instead of searching through grids of listings and static photos, users...

Staff Software Engineer | Applied AI / Voice AI📍 London | 5 days onsite (Central London - Near Old Street)💰 £150k–£250k + meaningful equityThis is a great opportunity to join a well-funded, YC-backed Series A AI startup in London building AI voice agents used by real businesses to automate customer conversations, scheduling, and operational...

We help companies get compensation right. What we get paid at work has a massive impact on our lives, and it s one of the biggest factors in hiring and retaining talent - and yet so many companies struggle to get it right. They simply have no choice but to rely on poor data and unsophisticated tools for their pay decisions. We help many of the world s most...

Job DescriptionThe Company:Rapidly growing educational media company and it is looking to expand its amazing team! e design award-winning products that enrich millions worldwide. A close-knit, collaborative group that obsesses about visual design to help and assist our clients.Continuing to grow and build out their product offerings, has given an exciting...

We're looking for an experienced Senior/Lead Developer to join our Resident Experience product team. You'll help design and develop our Resident Engagement products - a key part of our suite of solutions - which aim to enrich the lives of residents in care through meaningful interactions and engagement. You'll work across the full software development...

BT Group is the UK’s leading communications group and the holding company behind some of the country’s most recognised brands – including BT, EE, Openreach and Plusnet. Our purpose is as simple as it is ambitious: we connect for good. Our customers include consumers, small, medium and large businesses, public sector organisations and other...

Software Engineer Build technology powering the future of sustainable travel At SilverRail, we’re transforming the way the world travels. As rail becomes the preferred low‑carbon option for short and medium‑haul journeys, our technology powers seamless booking experiences for travellers and travel companies across the globe. With teams and offices...

Harrington Starr is seeking a Senior Java Developer to contribute to a cloud-native post-trade platform. This engineering role involves designing and delivering scalable backend systems, working closely with Product and Client Services teams.The ideal candidate will have a strong Java background, experience with distributed systems, and knowledge of modern...

Our client is a global credit ratings and risk analytics firm.For a complete understanding of this opportunity, and what will be required to be a successful applicant, read on.We unite the brightest minds to turn today's risks into tomorrow's opportunities. We do this by striving to create an inclusive environment where everyone feels welcome to be who they...

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...

We are currently seeking a Full Stack Engineer to join our dynamic team. Neoflow prides itself on its commitment to innovation, and as our Full Stack Engineer, you will play a pivotal role in developing and implementing cutting-edge solutions. This role is not just a job—it's a career packed with opportunities to grow and make a significant impact in a...

The role You'll own the backend systems Letly runs on — and the architecture other engineers build on: the software behind every viewing, tenancy, certificate, rent payment and repair. These are systems where correctness, reliability and scale are non-negotiable: real people's money, homes and legal exposure are on the line. This is a senior-to-staff hire....

Principal Software EngineerRead the overview of this opportunity to understand what skills, including and relevant soft skills and software package proficiencies, are required.Salary to £80k, poss higher for their ‘Unicorn' candidateRole can be based remotely, as long as you can occasionally travel to London for client work (travel expenses paid) -...

We’re looking for a Java Swing Developer to join a team working on a high-performance desktop trading platform. Working on a mission-critical system that supports FX Cash, deposits, futures, swaps, and more. The platform is rich in functionality, handles heavy loads with low latency, and underpins key trading and sales workflows.You’ll help maintain and...

Tata Consultancy Services in London is seeking an experienced Java Engineer to develop backend services and scalable microservices in a hybrid work setup. You will work on projects leveraging Java, Spring Boot, Kafka, and cloud technologies to deliver secure, high-performing systems.The role involves building CI/CD pipelines, implementing REST APIs, and...

Back End Developer London – Kings Cross £85,000 - £105,000 We're hiring Back-End Engineers to build the services Descrial runs on. Investment professionals need APIs and workflows that respect permissions, keep an audit trail and fail safely when an AI result can't be trusted. You’ll build multi-tenant data and workflow services, plus the integration...

Senior Software Engineer II - Contacts Team - Java Full-time Compensation: GBP 105,000 - GBP 130,000 - yearly Wise is a global technology company, building the best way to move and manage the world’s money.Min fees. Max ease. Full speed. Whether people and businesses are sending money to another country, spending abroad, or making and receiving...

AI is fundamentally changing how developers write, understand, debug, and maintain software. At the company, we're exploring what an AI-native development experience should look like for C++ developers. We are looking for a senior technical leader to help shape this future by building AI-powered workflows, integrating coding agents into developer tools, and...