senior software engineer- java jobs in London

Wise Platform is seeking an API Experience Engineer to join the API Experience Team in a hybrid London-based role. You will design, build, and lead scalable public APIs with Java, Spring Boot, Kafka, and PostgreSQL, shaping developer experience for global partners.The role emphasizes API standards (REST, OpenAPI/Swagger, OAuth2), mentorship, cross-functional...

RE Partners in London seeks an experienced and opinionated Java Developer to join the high-performing engineering team, building low-latency, high-throughput payments systems.You will design scalable real-time services using Core Java, Spring Boot, and RESTful APIs, while mentoring engineers and shaping architecture.This hybrid UK role offers opportunities...

Grid Dynamics is seeking an experienced Java/Kotlin Engineer to join the core engineering team delivering a major, multi-year strategic risk system replatforming programme. You will work at the heart of the programme, building key components within a highly scalable, risk-tolerant architecture designed to handle very large volumes of data in a demanding...

About Our Client Our client builds the commercial intelligence layer for bio-pharma go-to-market teams: a single source of truth for healthcare markets, spanning millions of clinician profiles, billions of prescription and procedure claims, institutional data on tens of thousands of hospitals and health systems, and fair market value benchmarking for...

Citi in London is seeking a Senior Low Latency Java Engineer to lead development of high-performance trading applications and frameworks. The role sits in the HPA team, focusing on Java-based microservices and low-latency design across Citi’s trading platforms.You will work with market data handling, time-series databases like KDB, and mentor junior...

A dynamic technology consulting firm based in the UK is on the lookout for an experienced Java Developer. The role requires expertise in Core Java and SpringBoot, focusing on developing high-throughput systems in the payments processing domain. Responsibilities include designing and optimizing backend systems, building RESTful APIs, and collaborating with...

Bounteous, a global AI Services firm, seeks a Senior Java Developer for a hybrid Glasgow role (3 days in office). Bring 4–12 years’ experience to design, build, and scale Java-based AI-enabled applications.You will work with Java 17, Kafka, Spring Boot, and AWS, interfacing with stakeholders to clarify requirements and deliver robust software in a...

A leading health retailer in London is seeking a Senior Backend Engineer to develop tools that enhance store design and optimize customer experiences. The role involves designing scalable backend services using Java and Spring within a hybrid working environment. Strong experience in backend development, API management, and databases is essential. This...

Salt Search is seeking a Senior Java Developer to design, develop and maintain cloud-native Java microservices on AWS, with a focus on security and observability. You will work closely with platform engineers, QA and product teams in a hybrid setup.This contract role in the travel sector spans 3–6 months, offering £550-£700 daily rate inside IR35, with...

FIS Global is seeking a skilled engineer to join the Worldpay by FIS team in a full-time capacity. You will implement AWS-hosted Java solutions, focusing on compute, storage, observability and security, while shaping a hybrid cloud/on-premises architecture.Initially hands-on, you’ll move toward a system architecture role as the cloud journey advances,...

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...

Rightmove is hiring a Senior Backend Engineer in London to design and deliver scalable features for our platform. You will work with Java 17+, Spring Boot, and a modern tech stack to empower millions of users and thousands of agents.The role emphasizes ownership, collaboration, and performance improvements within a hybrid, office-plus-remote setup. You will...

A technology consulting firm in the City of London is seeking a Senior/Principal Java Developer specialized in low-latency systems for the financial services sector. The role involves developing high-performance Java applications, eliminating performance bottlenecks, and maintaining a flexible work schedule. Candidates should have expertise in JVM internals...

Tesco Price Service team is building a robust, internet-facing Java API used across Tesco’s channels. The system powers pricing and promotions for 28 million UK shoppers weekly, with plans for global reach.Design and implement end-to-end systems, translate product requirements into clean code, and apply SOLID principles to scale our cloud-native infra on...

KX Systems, Inc. is seeking a Senior/Intermediate Java Engineer to join its R&D team in a hybrid London/Newry/Belfast role. Focus on backend and middleware development with Java 17 and Spring, integrating with kdb+ in a distributed, high-availability system.The incumbent will implement authentication/authorisation, security best practices, and contribute to...

Pontoon is hiring a Senior Full Stack Developer (Front End - Java / Angular / Solidity) for a London-based engineering team. This 12-month contract role is onsite five days a week, offering a salary of £50,000–£80,000 per year plus competitive terms.You will design and build scalable enterprise applications, deliver secure backend services in Java/Spring...

A global financial services organisation is seeking a Senior Java Engineer to contribute to a vital enterprise platform. This hands-on role involves not only development but also shaping technical standards and collaborating with senior engineers to enhance platform quality. Ideal candidates should have strong experience in Java backend development and the...

Are you passionate about building secure, scalable software and cloud infrastructure that supports critical services in production?Do you enjoy collaborating across teams, improving engineering practices, and helping others grow while delivering high-quality solutions? About our Team Working within Information Security & Data Protection division, the...

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...

About Us Fanatics is building a leading global digital sports platform. We ignite the passions of global sports fans and maximize the presence and reach for our hundreds of sports partners globally by offering products and services across Fanatics Commerce, Fanatics Collectibles, and Fanatics Betting & Gaming, allowing sports fans to Buy, Collect, and Bet....