Top Java Developer Jobs in London

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 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.

Lead engineering of metadata, meta-modelling, and distributed systems; produce and review secure production Scala/Java code; drive adoption and governance of AI-assisted engineering across the SDLC; influence product design and operations; mentor technical teams; establish automation, validation standards, and reuse of proven patterns.

Lead the design and delivery of metadata, meta-modelling, and distributed systems. Develop and review secure, high-quality Scala/Java production code, adopt AI-assisted engineering practices, improve automation and operational stability, and apply cloud-native and SDLC best practices within an agile team supporting financial services applications.

Develop, test, and support reliable, high-performance distributed Java applications for real-time streaming and concurrent workloads. Partner with stakeholders, present and review designs, improve reliability/observability/performance, and support production releases to meet SLAs within BGM Data & Analytics.

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

The role involves designing and building cloud-native applications using Java and Spring Boot, focusing on scalable microservices for financial institutions while leading agile practices.

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.

Design and maintain scalable Java backend systems, REST APIs, microservices, and distributed architectures. Lead technical and architectural decisions, promote testing and automation, mentor engineers, collaborate with clients and cross-functional teams, and evaluate emerging technologies including AI to improve engineering delivery.

Designs and executes manual and automated tests for web, API, and backend applications. Develops reusable automation frameworks, regression suites, and test scripts using C#/.NET or Java. Tests REST APIs, integrations, databases, cloud applications, performance, and reliability. Collaborates with developers and product owners to investigate defects, participates in Agile ceremonies, integrates testing into CI/CD pipelines, documents results, and improves quality processes and practices.

Design, build and maintain scalable, secure backend systems using Java and the Spring ecosystem. Lead architecture and API design, ensure quality through testing and observability, mentor engineers, drive delivery across initiatives, evaluate emerging technologies and AI capabilities, and collaborate with cross-functional teams to deliver client value.

Senior individual-contributor responsible for hands-on implementation, performance, scalability, resilience, and operational excellence of a Java/AWS-based Risk Screening platform. Partners with architects and SREs, leads complex changes, optimises large databases, and mentors engineering teams to ensure reliable, high-performance production systems.

Design, architect, and develop customer-facing digital and e-commerce products across web, mobile, social, and in-store channels. Work in Agile Scrum teams using continuous integration and delivery, advise clients on engineering best practices, optimize databases and queries, and contribute to testing and code quality. Mentor and coach team members, promote skills development, and collaborate onsite with clients throughout the software development lifecycle.

Develop and maintain FlexONE OMS/EMS features in Java/Scala. Design UI components (Swing), implement features and performance improvements, write unit tests, and support CI/CD (Docker, Jenkins) within an agile Kanban team.

Lead development of the Jamf Insights web application, design and implement features in a microservice architecture, build and test APIs, troubleshoot performance, produce designs, complete work end-to-end, and communicate technical concepts to stakeholders across Product, Cloud, and Support.

Develop and maintain backend Java applications for FX trading, focusing on performance, concurrency, reliability and scalability. Own features from development to production, write automated tests, improve delivery pipelines, investigate production issues, and collaborate with product, operations and engineering teams.

As a Senior Software Engineer, you'll enhance the Affiliate Marketing platform by designing reliable services, mentoring engineers, and ensuring system efficiency using Agile methodologies.

Hands-on senior fullstack developer building backend-led JVM services (Kotlin/modern Java) and responsive React/TypeScript frontends. Design APIs, event-driven workflows, tests, CI/CD pipelines, observability, and contribute across discovery, deployment, production support, and technical decisions while validating AI-assisted tools where helpful.

Senior backend engineer responsible for designing, building and operating ad-serving backend services and APIs. Collaborate with product and design, drive technical decisions, mentor engineers, ensure reliability, performance, scalability, and strong automated testing and deployment practices in containerised environments.

Join Visa as a Software Engineer in Test, focusing on API testing, CI/CD integration, cloud solutions, and implementing QA best practices within an Agile team.

Lead an application development team to build and evolve next-generation trading applications, focusing on microservices and automation in finance.

Lead design, development, deployment and operation of cloud-native Java microservices. Provide technical leadership, drive CI/CD, IaC (Terraform), observability, testing and production support across AWS and Kubernetes environments.

Design, develop, test, and maintain Java applications across the full software lifecycle. Collaborate on system design, troubleshoot issues, build microservices, integrate AI-assisted tools, implement APIs, and follow risk, compliance, and DevOps best practices to deliver robust software solutions.