senior java developer jobs in London

Marks & Spencer plc is hiring a Senior Software Engineer to evolve the Order Management platform that powers order fulfilment from checkout to delivery, with support for amendments, cancellations and returns. You will own features end-to-end, drive architectural improvements, and raise the bar for reliability and security in a large retail operation.You’ll...

United States Digital Space LLC is seeking a mid-level to senior IC to join our core engineering team. You will be responsible for implementing and maintaining our Java client library, and working alongside our core engineering team on the most performance-sensitive parts of our codebase.You will design, develop, and maintain high-performance server...

LexisNexis Risk Solutions is seeking a Senior Software Engineer to design, develop, and deliver scalable Java-based applications using modern cloud-native practices in London. You will collaborate with Product, UX, QA, and engineering teams to build robust applications, mentor engineers, and drive architectural decisions using Spring Boot, Angular/React, and...

Addition Solutions is seeking an experienced Backend Developer (Java/Spring Boot) for a fully remote contract. The role focuses on building scalable backend services, REST APIs and microservices in a high-volume environment. You will work with Java and Spring Boot, delivering reliable and efficient backend systems.Prior experience in iGaming, FinTech or...

Grid Dynamics is partnering with JUXT on a Tier 1 investment bank project to build a next-generation FX Risk Platform. You will join a team delivering FX Options end-of-day Official Valuation capabilities using Java, Kotlin and Apache Flink.You will own the development lifecycle from requirements to production, collaborating with the bank's engineers,...

We are seeking aSenior Software Engineerto join theRisk Services team within GlobalMarkets.This role focuses on designing and buildingscalable, distributed systemsthat supportrisk data processing,analyticsandreporting workflows.The ideal candidate will have strong experience acrossJava and Python-based backend systems, with a solid understanding ofrisk data...

Raytheon UK is seeking a Senior Software Engineer in London to design and build enterprise software in an agile, cross‑functional team. The role requires active eDV clearance and onsite work with potential remote/hybrid options depending on role and site requirements.Applicants should have strong Java/Spring Boot experience, modern frontend skills...

JPMorgan Chase in London is seeking a Senior Lead Software Engineer to join an agile team and design and deliver trusted market-leading technology products in a secure, scalable way.You will build robust software across front-end and back-end stacks, mentor junior developers, conduct code reviews, and ensure high-quality production code using Java 17+ and...

We are on the lookout for a Senior Java Developer to join our Elasticsearch team and drive our work on the Inference API in ElasticsearchThe Elasticsearch Inference API is the integration layer between Elasticsearch and external machine learning services including Elastic’s own Elastic Inference Service (EIS), third-party providers (Anthropic, OpenAI,...

Harmonic Security is seeking a Senior Software Engineer to join the Intercept team, building the Endpoint Agent and Browser Extension that run on customer devices, along with the backend services. You’ll work across Java backend systems, Rust, and TypeScript, delivering fast, secure, and scalable software.You’ll join a fast-moving startup with a strong...

IG Group in London seeks a Senior Software Engineer specializing in Java and AI to advance Brokerage Services engineering. You will build AI‑assisted tooling, improve testing, and push for secure, scalable automation across the CI/CD pipeline.You will own features end‑to‑end, collaborate with product and security teams, and mentor peers while shaping...

A leading financial institution in London is seeking a Senior Java Developer for a 10-month onsite contract. The role involves designing, building, and maintaining Java-based backend systems, with a focus on cloud-native and microservices architectures. The ideal candidate has hands-on experience with Java, cloud technologies, and mentoring skills....

JPMorganChase is seeking a Software Engineer III in London to own end-to-end delivery of secure, full stack features using Java, Spring, and microservices. You will work with Kafka/event-driven patterns, CI/CD pipelines, and robust testing to improve performance and resiliency.You will mentor teammates, participate in architecture reviews, and help shape...

FDJ UNITED is seeking a Senior Quant Model Engineer to lead on building, optimising and deploying production-grade services for a cutting-edge sportsbook platform. You will work within the Pricing Engineering team, focusing on low-latency microservices, robust APIs, and scalable data products.The role emphasizes hands-on technical delivery, architectural...

Galaxy Digital seeks talented software engineers to join its London trading technology teams and build the next generation of crypto trading systems. You will contribute to server-side Java development with a focus on order management, market connectivity, low latency messaging, and price distribution in a fast-paced trading environment.The role calls for...

London | Hybrid | Tier 1 Investment BankThe OpportunityWe are partnering with a Tier 1 investment bank on a major, multi-year Equity Accelerator programme focused on modernising its Prime Finance Equities platform. The programme is re-engineering core trading and post-trade systems, introducing new data and market-expansion platforms, and enabling advanced...

Vertus Partners in London is seeking a hands-on Java Software Engineer to own design and delivery of distributed backend services in a banking environment. You will work on microservices, cloud deployments (AWS), and architecture decisions while writing production-grade Java and keeping systems scalable, resilient, and observable.The role offers a flexible...

J.P. Morgan is seeking a Senior Lead Software Engineer in London within Asset & Wealth Management's International Private Bank Technology organisation. You will design, build and improve scalable client-facing capabilities for J.P.Morgan Online International, contributing to production code and guiding engineers through substantive technical feedback. You...

Job TitleSenior Software Engineer - (Java/AI) Brokerage ServicesJob DescriptionSo, who are we?IG has been at the centre of retail trading and investment since 1974, when we helped create the market for financial spread betting. Today, we're a FTSE100 fintech operating across five continents, serving over 700,000 clients and handling billions in transactions...

Senior Software Engineer II - Account Integrity Full-time Compensation: GBP 111,000 - GBP 145,000 - 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...