19 of 19 Legacy Code Jobs in London

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 ...

Python or 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-critical, high … Python or 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-critical, high ...

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 ...

Building systems with a constant focus on testing, reliability, scalability, and maintainability.Designing, modeling, and programming in a variety of languages and technologies. Working on legacy code as well as green field development.Initiative driving projects to completion.Learning and promoting new technologies with a focus on best practices.Providing on-call ...

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 ...

Python or 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-critical, high ...

Python or 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-critical, high ...

Python or 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-critical, high ...

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 ImpactDrive a strategic transformation: Work alongside domain … cloud-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 ...

trading and research analysis workflows by utilizing and expanding on DRW’s in-house infrastructure and improve productivityEvaluate new technologies and identify/deprecate legacy code to improve on the current technological stackCollaborate with other engineers, traders, and researchers to design custom frameworks or end-user solutionsWrite performance … sensitive code and user-friendly APIs to facilitate access to our in-house data analysis infrastructureLead design discussions and conduct code reviews to maintain high standards and quality of written codeRequirements:Bachelor’s or Master’s degree in Computer Science or related Engineering disciplineMinimum of 3 years ...

beyond the team, and drive data-driven decisions. You love to build new things but also don’t shy away from digging into a legacy codebase. Qualifications Experience working with Python & Serverless Strong fundamental programming skills (data structures, algorithms) Excellent communication skills, both written and spoken An interest ...

drive data-driven decisions across talented colleagues. You love to build new things but also don’t shy away from digging into a legacy codebase. You will mentor builders across the company to advance from basic AI usage to sophisticated system creation, aligning with our long-term mission. #J ...

London in need of a developer to architect and enhance their regulatory reporting infrastructure. You'd be designing systems from scratch, not just maintaining legacy code. The technical challenges involve processing massive datasets, implementing robust validation protocols, and creating scalable solutions that meet strict regulatory requirements. ...

final implementation. A significant portion of your time will be spent building new products and systems, meaning you will spend less time maintaining legacy code and more time creating. You will also serve as the go-to front-end expert on the team, tackling UI-complex challenges ...

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 ...

more modern Android development tools, including Jetpack Compose, Coroutines/Flow, MVVM, Webviews, other Jetpack libraries, and modular app architectures Ability to test code and promote a culture of testing Experience with JVM unit testing, instrumented testing, and UI regression testing Comfortable working with cutting-edge technologies and legacy code Experience in, or willingness to take on, a leadership role in team projects Rough understanding of iOS development and interest in learning more Nice to have: familiarity with Swift and ObjectiveC for iOS, Scala and Typescript for server-side development Условия: £82,000 Per year One office ...