9 of 9 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 ...

vendor that’s utilised within the Financial Service industry. What You’ll Work With C# .NET Framework SQL Server WinForms desktop applications Azure infrastructure Legacy platform modernisation Automated testing Kafka Future platform direction includes: Docker/containerisation Modernised execution architecture Core Responsibilities: Maintain and improve the trading execution platform … Refactor and enhance a long-lived C#/.NET application Make safe changes to legacy code while preserving behaviour Write tests that validate and document system behaviour Deliver small, well-structured changes with clear commits Work with traders to support real-time trading needs Improve system usability ...

will take ownership of modularizing large existing codebases and setting up the architecture for new projects from scratch. You will work closely with code, design and art teams to ensure our technical pipeline is scalable, maintainable, and efficient. The ideal candidate is an expert in software design patterns … define coding standards and mentor the team toward a cleaner, more robust code infrastructure. Responsibilities Architect and build scalable game systems from the ground up for new, greenfield projects, ensuring they are built on a solid, future-proof foundation. Lead the refactoring of legacy code, transitioning monolithic ...

their fields, pushing the boundaries of technology and finance every day. Innovation & Impact: Work in a modern, young codebase with minimal legacy code and technical debt. You’ll have the freedom to choose the best technology for the job, allowing you to innovate and deliver at an unmatched ...

Observability: Incorporating robust monitoring, alerting, and reliability into every service. Engineering Culture: Open Source friendly (internal and external) with a pragmatic approach to improving legacy code. Deep understanding of financial systems What’s on Offer Competitive salary and benefits package. Discretionary performance-related bonus. Dedicated budget for continued development ...

will have real ownership, real influence on architecture and direction, and the opportunity to rebuild and redesign systems end to end rather than maintaining legacy code. What you will be working on Designing and building high performance C++ systems that sit directly in the live trading path Optimising latency ...

development patterns, context management, and test-driven development. Confident delivering technical training to varied audiences and managing live troubleshooting. Experience working with MCP servers, legacy codebases, or multi-tool AI development environments is highly beneficial. How to Apply If you are excited by the opportunity to teach cutting-edge ...

daily Why this role is different Massive autonomy - you're not one of 20 engineers; your work is the work Greenfield build - no legacy code to untangle Direct access to technical leadership Clear, valuable real-world use case Hybrid flexibility after the first month If you enjoy creating ...

Java 21, Kafka, Postgres, Docker, Terraform Frontend: SolidJS, TypeScript Infra: AWS (Serverless & Containers), Confluent AI Ops: Heavy daily use of AI Coding Assistant (Claude Code) Who You Are Keep current with tech advancements and think forward Flow state is in architecture, managing agents, code quality - not just writing … code Proactively automate workflows and hate manual work AI can solve Thrive in early-stage environments, driven by impact Eager to learn, aware of blind spots, build great team camaraderie Must-Haves Polyglot mindset - read and review Java 21 (Node, Python, Go experience welcome) Frontend experience in SolidJS preferred ...