20 of 20 Legacy Code Jobs in London

outcomes. Задачи: Re-engineer core trading and post-trade systems into event-driven, cloud-native services on the JVM using Java and Kotlin; Modernize legacy components while maintaining the stability of a live, financially significant platform; Build new data and market-expansion platforms, alongside plumbing for cross-margining … stakeholders and upstream and downstream teams to build domain knowledge without relying on Business Analysts; Use AI-assisted and agentic development tools to accelerate legacy code analysis, test generation, prototyping, and refactoring. Требования: Expert-level Java expertise and production Kotlin experience, or a clear appetite to adopt Kotlin ...

operations – a mature, revenue-generating system that has evolved over years and continues to scale. If you enjoy owning real systems, thinking architecturally, improving legacy code thoughtfully rather than rewriting it, and being trusted to deliver without heavy supervision, this role will feel unusually well-matched. The role … calm, root‐cause mindset Incrementally improving system architecture using sound design principles (including modular design, DDD‐style thinking, and pragmatic architectural patterns) Reviewing code, raising standards constructively, and contributing to a disciplined engineering culture Leveraging modern tooling (including AI‐assisted development) to improve quality and velocity This ...

Java, to successfully accomplish development tasks. Conduct thorough testing at the unit, functional, and integration levels to ensure software reliability and performance. Handle both legacy code and new development projects. Promote collaboration and synergy among traders, researchers, and software engineers. Qualifications: Experience in designing, developing, and supporting mission … Java, to successfully accomplish development tasks. Conduct thorough testing at the unit, functional, and integration levels to ensure software reliability and performance. Handle both legacy code and new development projects. Promote collaboration and synergy among traders, researchers, and software engineers. Qualifications: Experience in designing, developing, and supporting mission ...

untangling complex systems and modernising core infrastructure without breaking production. This is an exciting opportunity to modernise core C#/SQL systems! Extract legacy business logic, build clean services, and verify changes in shadow mode with zero downtime to revenue flows. Extract business rules scattered across C#, embedded JavaScript … rules assemblies. Build new services cleanly. with proper Dependency Injection (DI), robust authentication/authorization, structured logging, and full observability. Work fluently across both legacy .NET Framework 4.8 (ASP.NET MVC5, WebAPI 2, EF6) and modern .NET, as both will coexist for the whole transition period. Navigate across the multiple ...

Developer KeynotesKotlin & Jetpack Compose first approachOver 10M+ downloadsThe codebase uses modern Android Jetpack components, Kotlin Coroutines, Flow/StateFlow, and RxJava in legacy areasMake an impact on millions of customersNever ending chance of experimenting with latest tech, including KMM, Jetpack Compose and more! We have done some significant work … Android developerYou are extremely comfortable with KotlinYou know reactive programming techniquesYou can contribute to discussions on technical architecture and design You believe that all code is legacy code if it isn't unit/UI testedYou love agile/scrum and can work as part ...

development team to maintain and update the bespoke ecommerce platform, taking a proactive approach in evolving the back-end technology stack and migrating legacy code across to an ASP.NET framework. Advocate integration of technologies and development methodologies to help drive the business forward and ensure a robust, scalable … Manager to maintain and update the bespoke Classic ASP ecommerce platform. Develop new features for a localized ASP.NET MVC 5 platform and contribute migrating legacy features over to this new platform. Write maintainable, scalable, fault-tolerant code, utilizing SOLID principles and OO design/architectural patterns, TDD, etc. ...

slowing the pace of new development. Demonstrable hands-on experience applying AI to software engineering at team scale with measurable results (e.g. AI-driven code modernisation, test generation for legacy code or agentic development workflows) and an informed point of view on how AI will change both ...

slowing the pace of new development. Demonstrable hands-on experience applying AI to software engineering at team scale with measurable results (e.g. AI-driven code modernisation, test generation for legacy code or agentic development workflows) and an informed point of view on how AI will change both ...

Extensive experience in C++ using modern C++ (C++17/20) while possessing a solid understanding of older standards (C++98/03) for adapting to legacy code and systems seamlessly. Experience in Python. Programming experience in a Linux environment (Windows experience is a bonus). Expertise with Docker ...

Java, to successfully accomplish development tasks. Conduct thorough testing at the unit, functional, and integration levels to ensure software reliability and performance. Handle both legacy code and new development projects. Promote collaboration and synergy among traders, researchers, and software engineers. Qualifications: Experience in designing, developing, and supporting mission ...

integrate complex enterprise applications within a global financial services environment. The role will use Java, Oracle and the Spring Framework to support highly customised legacy platforms and process large-scale external data feeds. You will help protect data integrity across downstream ledger, risk and margin systems by documenting data … ingest, transform, and validate large-scale daily CCP clearing and market data feeds. Produce comprehensive architectural specifications and interface inventories by reverse-engineering legacy code, PL/SQL packages, and database dependencies. Establish robust data mappings, lineage tracking, and schema definitions that maintain strict ledger, risk, and margin ...

Product, Design, QA and Engineering teams * Troubleshoot, debug and resolve technical issues * Contribute to performance optimisation and improving application quality * Work with existing and Legacy codebases where required * Write unit and integration tests * Design solutions to open-ended technical problems * Work effectively within a globally distributed engineering environment …/or CircleCI * CI/CD practices * JUnit and Espresso * Unit and integration testing * Experience debugging and optimising mobile applications * Comfortable working with Legacy code * Strong communication and collaboration skills Technologies Kotlin | Coroutines | Flow | Jetpack Compose | MVI | REST APIs | OkHttp | Dagger | Gradle | GitHub Actions | CircleCI | Espresso | JUnit | WireMock ...

Java, to successfully accomplish development tasks. Conduct thorough testing at the unit, functional, and integration levels to ensure software reliability and performance. Handle both legacy code and new development projects. Promote collaboration and synergy among traders, researchers, and software engineers. Qualifications: Experience in designing, developing, and supporting mission ...

Java, to successfully accomplish development tasks. Conduct thorough testing at the unit, functional, and integration levels to ensure software reliability and performance. Handle both legacy code and new development projects. Promote collaboration and synergy among traders, researchers, and software engineers. Qualifications: Experience in designing, developing, and supporting mission ...

lean heavily into AI‐driven development. Using Goldman Sachs' AI tooling and agentic coding assistants, you will govern multiple AI agents, rapidly comprehend large legacy codebases, generate and assess production‐quality code, and accelerate every phase of the software development lifecycle. Your Impact Drive a strategic transformation : Work … centric, AI‐driven world, and define and deliver the requirements for CTL integration. Multiply your output with AI : Orchestrate AI coding agents (e.g., Claude Code, GitHub Copilot, Devin, Gemini Code Assist) across all stages of the SDLC while maintaining mastery, quality, and production fitness over all AI‐generated ...

lean heavily into AI-driven development. Using Goldman Sachs' AI tooling and agentic coding assistants, you will govern multiple AI agents, rapidly comprehend large legacy codebases, generate and assess production-quality code, and accelerate every phase of the software development lifecycle. Your ImpactDrive a strategic transformation: Work alongside … centric, AI-driven world, and define and deliver the requirements for CTL integration. Multiply your output with AI: Orchestrate AI coding agents (e.g., Claude Code, GitHub Copilot, Devin, Gemini Code Assist) across all stages of the SDLC while maintaining mastery, quality, and production fitness over all AI-generated ...

team in London. You will build high-quality front-end features with React and TypeScript, focusing on clarity, performance, and maintainability. You will refactor legacy code, fix issues across the stack, collaborate with product managers and designers, and provide code reviews while mentoring teammates to improve quality ...

high-quality engineering on mature platforms. The ideal candidate will have 8-15 years of experience, strong Python skills, and comfort navigating complex legacy code. This position offers an opportunity to make architectural decisions and contribute to the company's operational growth, while working alongside senior decision-makers. #J ...

serving millions with events, news and app experiences. We seek an experienced iOS engineer to design major features, align iOS/Android APIs, modernise legacy code, and raise release quality through tests and monitoring. You will mentor teammates, collaborate with web/platform teams, and help steer ...

healthy balance between delivering new features and strengthening our technical foundations. You’ll also embrace a DevOps mindset, taking full ownership of your code from idea and development through to deployment, including AWS solution design, security, and observability. Beyond your technical contributions, you’ll play a vital role … supporting the growth of your teammates through code reviews, pair programming, and knowledge sharing. You’ll help foster a culture of learning, ownership and continuous improvement, ensuring that your team grows stronger together with every project you take on. What type of person fits the role ...