Top Java Developer Jobs in London

Own the technical roadmap and delivery of large-scale backend projects for Wise’s global KYC and onboarding systems. Design scalable Java microservices, clean APIs, asynchronous integrations, and risk mitigation systems supporting regulatory compliance. Improve reliability, security, scalability, and technical debt management while solving ambiguous problems. Lead cross-team initiatives, mentor engineers, promote coding and testing best practices, and optimize relational and non-relational databases handling sensitive information.

Design, develop, test, and support secure, scalable, low-latency electronic trading software using Java and Spring. Contribute to architecture, system integrations, performance optimization, production support, incident resolution, automated testing, CI/CD, observability, code reviews, and continuous engineering improvements. Apply FIX protocol expertise while collaborating within an agile team.

Build and scale Wise’s recommendation platform, referral APIs, customer onboarding experiences, and reward mechanisms. Collaborate with product managers, data scientists, analysts, designers, and engineers to improve customer journeys. Develop reliable, testable distributed systems, contribute to coding standards and reviews, communicate technical concepts clearly, and take end-to-end ownership of customer-focused projects.

Leads development of high-performance, latency-sensitive trading systems using Java and Python. Oversees architecture, coding, testing, APIs, integration strategies, observability, resilience, security, incident response, and operational readiness. Guides agile delivery through technical planning, code reviews, retrospectives, and mentoring. Establishes responsible use of AI-assisted engineering tools and validates outputs for correctness, performance, and security in a regulated financial environment.

Lead technical strategy, architecture, and delivery for a large-scale risk analytics and reporting platform. Design scalable Java and React-based applications, govern frontend architecture and design systems, integrate enterprise platforms and data sources, and drive reliability, resiliency, observability, security, and compliance. Partner with Risk, Product, Data, Architecture, and Engineering stakeholders while evaluating AI, machine learning, and generative AI capabilities for analytics, automation, and decision support.

Leads software engineering for a secure, scalable cloud data platform supporting credit risk technology. Responsibilities include designing and delivering Python solutions, reviewing production code, building CI/CD pipelines, improving application resiliency, standardizing SDLC tooling, automating remediation, and guiding responsible AI-assisted engineering practices. The role also evaluates vendors and leads cross-functional delivery initiatives involving AWS, Databricks, Spark, Terraform, lakehouse architecture, observability, security, and governance.

Lead technical contributor on the ETF Technology team delivering secure, scalable Java/Oracle applications. Design, develop, test, and support production systems; partner with product, portfolio management, and platform teams; drive operational stability, automation, and adoption of enterprise AI-assisted engineering practices.

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.

Build and operate backend and frontend systems that prevent account takeovers, scams, and financial crime. Own projects end to end, develop real-time detection and prevention controls, improve automation, design resilient database schemas, operate distributed systems and CI/CD pipelines, and collaborate with Product, Data Science, and Investigations teams. The role is approximately 80% backend and 20% frontend, with a strong focus on customer protection, product ownership, testing, and data-driven decisions.

Build and scale backend systems for Wise’s recipient management experience. Own the technical vision for recipient services, including scalable distributed systems, search, databases, RESTful APIs, and customer-facing functionality. Collaborate in an autonomous agile team with product managers, designers, and analysts while applying strong coding practices, testing, code reviews, and data-driven product decisions.

Build scalable backend systems and customer-facing financial products for Wise’s shared-finance offerings, including international joint accounts and kid accounts. Collaborate with product, design, data, and research teams to shape ambiguous ideas, influence architecture and product direction, and deliver reliable systems globally. Work includes money movement, spending, authorization, compliance-related systems, shared-account infrastructure, greenfield development, and infrastructure scaling.

Lead development of secure, high-performance, low-latency cloud-based payments applications using Java and AI-assisted engineering practices. Responsibilities include designing and coding payment flows, reviewing and debugging code, establishing secure coding and automated testing standards, supporting production stability, coaching engineers on responsible AI adoption, evaluating architectures, and promoting modern software engineering practices across the organization.

Leads Java development for CitiDirect Payments, providing technical direction, mentorship, architecture, hands-on coding, code reviews, and delivery oversight. Modernizes payment validation systems using microservices, Spring, REST APIs, databases, Kafka, and event-driven architecture. The role drives technical strategy, scalability, security, quality, innovation, and collaboration across global development teams while managing technical debt and developing engineering talent.

Develop and test cloud-based full-stack applications and prototypes using Java, Spring Boot, Python, TypeScript, Angular, and Azure. Build REST APIs, integrate microservices and event-driven systems, create accessible responsive interfaces, contribute to CI/CD and automated testing, and apply secure coding practices. Collaborate with architects, data engineers, and UX designers during discovery-phase projects. The role requires active SC clearance and occasional travel to London.

Design and develop Java and Python applications, lead projects, and mentor junior developers. Ensure robust application testing and support production issues.

Design and build scalable backend features using Java and Spring Boot. Collaborate with cross-functional teams, lead complex projects, make technical decisions, balance feature development with technical debt, optimize performance and testing pipelines, and mentor junior engineers while delivering reliable solutions for millions of users.

Develop and maintain Java and Kotlin software for a collateral management platform supporting 24/7 trading. Contribute to distributed, real-time, event-driven systems; trading venue integrations; reference data frameworks; and accounting pipelines for traditional and digital assets. Debug production code, build new functionality, participate in code reviews, and collaborate with experienced engineers while learning financial market infrastructure.

Develop and enhance Java applications, translate complex requirements into technical specifications, and build scalable cloud-native solutions using Spring Boot, Kafka, AWS, and microservices. The role includes implementing architecture patterns, writing comprehensive automated tests, working with relational and non-relational databases, supporting CI/CD, addressing information security and data privacy requirements, and mentoring junior developers.

Design and develop Angular applications and cloud-native AWS services supporting client onboarding journeys. Build integrations with APIs, third-party services, and internal platforms; write tested, maintainable code; use AI-assisted development tools; and contribute to architecture, code reviews, documentation, and continuous improvement. Collaborate with product owners and globally distributed engineering teams to deliver customer-focused digital experiences.

Hands-on senior software engineer responsible for designing, developing, testing, deploying, monitoring, and supporting BlackRock’s cloud-native Private Markets platform. The role involves Java backend and React/TypeScript frontend development, scalable APIs and services, event-driven workflows, architecture evolution, CI/CD, incident investigation, and secure data-centric systems. The engineer will use AI-powered development tools and integrate AI capabilities into products while collaborating with engineering, product, architecture, and QA teams.

Design, build, test, and maintain scalable full-stack web applications and integrations using Java, Python, and React. Implement AI-enabled features, event-driven data pipelines, and marketing integrations (CDP/CRM/CMS). Improve code quality via AI-assisted tools, CI/CD, observability, and security/compliance best practices while collaborating with product, marketing, and partners.

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.

Develop large-scale Java software for enterprise and eCommerce clients using technologies including Spring Boot, AWS, and MySQL. Champion software quality and technical vision, apply TDD, BDD, and XP practices, solve complex problems collaboratively, and contribute effectively within multidisciplinary teams.

Architect, develop, deploy, and own scalable software services and API-heavy solutions for a high-throughput global payments platform. The role involves designing complex systems using serverless, event-driven microservices; improving web-service performance; mentoring junior engineers; contributing to technical interviews; and driving engineering best practices and process improvements.

Design, build, and optimize high-performance, low-latency Java services and protocols for exchange, matching-engine, and trading infrastructure. Develop order, session, instrument, and account models; create automated testing and benchmarking strategies; diagnose production issues; and support deployments. Collaborate with clients, SREs, QA, and leadership to deliver production-ready, observable systems and communicate technical trade-offs clearly.