Top Java Developer Jobs in London

The Java Developer will create new features for policy administration and claims handling, while also integrating new systems and documenting work according to standards.

Lead design, development, testing, release, and production support for Equity Derivatives workflows. Own production outcomes, incident triage, stakeholder communication, UAT, architecture and observability. Drive adoption of AI-assisted engineering practices, maintain release discipline, gather telemetry for stability metrics, and improve system reliability and coding hygiene through cross-functional collaboration.

Lead development of the QES trading platform: design, build, test, and maintain production-grade software. Collaborate with front office (trading, structuring, research), deliver secure high-quality code (Python/Java/TypeScript/React), automate operational remediation, and lead agile engineering practices and communities of practice.

Lead backend engineering efforts to design, build, and operate scalable, reliable, and secure cloud-native services using JVM languages. Drive domain modeling, performance optimization, zero-downtime releases, incident remediation, automated testing, and adoption of approved AI-assisted engineering practices while mentoring teammates and promoting reusable patterns.

Lead backend engineering work using JVM languages to design scalable, reliable, secure, cloud-native, multi-cloud solutions. Drive domain modeling, performance optimization, zero-downtime releases, incident resolution, and operational excellence. Champion adoption and governance of enterprise-authorized AI-assisted engineering practices and SDLC toolchain automation while coaching teams on responsible, secure AI use.

Design, build, and maintain large-scale, secure data engineering solutions. Lead architecture, deliver production code, drive automation and operational stability, mentor teams, and evaluate vendor/technology choices to advance risk technology platforms.

Design, build, and maintain scalable, secure, cloud-native backend systems using JVM languages. Ensure reliability, performance, and zero-downtime releases; use domain modeling, automated testing, and enterprise AI-assisted tools to improve code quality and delivery.

Lead development of Java/Spring Boot microservices for J.P. Morgan Personal Investing. Design and evolve cloud-native, event-driven architectures on Kubernetes using Kafka, deliver features from estimation to production, write tests, participate in code reviews, maintain monitoring/alerting, and drive adoption of enterprise-authorized AI-assisted engineering practices and SDLC automation.

Lead development of low-latency equities algorithmic trading strategies and execution platform. Build simulation and automated testing, analyze and tune models/signals, support production incidents, and create scalable real-time processing solutions.

Lead engineering efforts for the Equity Derivatives trading platform: design, build, and troubleshoot Java/JVM microservices, adopt AI-assisted engineering practices, collaborate with traders, quants, product and production teams, and drive CI/CD, resiliency, and secure development across the Agile delivery lifecycle.

Design, develop, and maintain scalable, secure backend systems for fintech products. Build REST APIs and microservices supporting card payments, treasury management, transaction booking, and crypto liquidity. Work primarily with Java, PostgreSQL, and Spring Boot while applying clean code, TDD, DDD, and CI/CD practices. Collaborate with a high-performing team to deliver greenfield and existing-system improvements.

Design, build, test, and operate secure full-stack features using Java-based microservices and event-driven architectures. Contribute to system design, debugging, automation, CI/CD, and production stability. Collaborate on architecture reviews, share engineering best practices, and responsibly use enterprise AI-assisted development tools.

Design, develop, and maintain secure, high-quality production code and system architectures. Troubleshoot complex issues, analyze large datasets for improvements, ensure application resiliency and CI/CD practices, and contribute to engineering communities and inclusive team culture.

Design, build, test, release, and operate secure, resilient full-stack features for production services. Lead architecture and delivery, author and review Java-based code, troubleshoot cross-service production issues, implement automation and CI/CD, improve performance and stability, and mentor teammates while responsibly leveraging enterprise AI-assisted development tools.

Build and maintain scalable backend systems using Java, Node.js, Spring, AWS, microservices, and REST APIs. Lead architecture and technical design, promote secure and reliable engineering practices, drive automated testing and CI/CD, mentor engineers, collaborate with clients and cross-functional teams, and evaluate AI and emerging technologies to improve software delivery.

Build and maintain the Payin Platform that handles how money enters Wise. Design Payin Session and Payment abstractions, ensure reliability and scalability for high-volume transactions, collaborate across teams, write testable code, drive end-to-end ownership, and improve APIs and systems for excellent customer experience.

Develop performant, reliable, and well-tested software across backend, frontend, distributed systems, blockchain integrations, and cloud-based applications. The role emphasizes core Java, pair programming, continuous integration, automated testing, knowledge sharing, team rotations, and regular personal development. Developers work collaboratively across a broad technology stack while contributing to a high-performance financial exchange and improving developer experience and technical debt.

Build and evolve a real-time trading risk platform for sportsbook operations. Design distributed streaming components, process the full bet lifecycle, implement complex financial calculations, aggregate exposure, create alerting systems, and optimize high-throughput, low-latency services. Ensure event ordering, idempotency, consistency, scalability, and resilience while collaborating with trading and product teams. The role uses a Flink-based, event-driven architecture and integrates with trader-facing downstream systems.

As a Principal Backend Engineer, you will build scalable backend services with Java, design APIs, implement microservices, and work with AWS cloud technologies.

Develop performant, reliable, and well-tested software for a high-performance financial exchange. Work across backend, frontend, cloud, data, and testing systems, including distributed core Java, Kafka, MySQL, JavaScript, Vue.js, Kubernetes, and Python. Collaborate through pair programming, team rotations, continuous integration, and continuous delivery while contributing to greenfield projects, performance-critical components, blockchain integrations, and developer-experience improvements.

Lead development of Java-based risk-engine components supporting margin calculations, quantitative models, market and trade data integration, and production-scale execution. Own delivery across the SDLC, including testing, controlled releases, performance, resilience, auditability, and operational support. Provide technical leadership on risk calculation orchestration and platform architecture while collaborating with infrastructure, security, and DevOps teams in a regulated financial-services environment.

As a Full Stack Engineer, you will handle the full development lifecycle, engage with stakeholders, and promote best practices in engineering.

Design, build, and maintain high-performance Java backend systems that integrate and deploy AI/ML models. Develop RESTful microservices, optimize performance and security, implement CI/CD, work with cloud platforms and container orchestration, and collaborate with data scientists on scalable ML solutions.

Join as a Senior Java Engineer to develop scalable Java applications, utilizing frameworks like Spring and CI/CD practices. Engage in a talent community before roles open, emphasizing Java proficiency and distributed systems knowledge.

Develop reporting services within a Public Protection Directorate project team. Build secure user interfaces and microservices for personal and sensitive data, working with legacy and new data structures, development and support teams, and vendors. The role requires PHP and Java web application development, API integration, testing, CI/CD, data encryption, and Linux-based tooling. The specialist will collaborate with public-sector teams and may coach colleagues in agile development practices.