11 of 11 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 ...

market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacy code or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus on being ...

market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacy code or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus on being ...

team is building systems that detect infringement, streamline R&D, and empower creators to move faster. It’s a true greenfield opportunity, no legacy code, no bureaucracy, just the freedom to solve challenging technical problems with impact. The founding team comes from some of the world’s most ...

redesign of their data stack, including containerising workflows, migrating to cloud SQL, and introducing tools like Prefect. Maintain and optimise 60 Python pipelines, refactoring legacy code into modular components. Keep Power BI dashboards accurate and up to date, supporting evolving business needs. Help implement validation and anomaly detection … their pipelines to ensure data integrity. Manage Git workflows and assist in setting up lightweight deployment pipelines. Maintain clear, up-to-date records of code, processes, and workflows. Occasionally assist the research desk with Python-based analysis and data visualisation. Skills & Experience: Essentials: BSc in Computer Science ...

complex, regulated data environments. Key Responsibilities Perform source-to-target mapping , documenting field-level lineage across systems and transformation layers Analyse and interpret complex legacy SQL stored procedures (including multi-CTE logic, temp tables, and parameterised pipelines) Support data migration validation , ensuring accuracy and completeness of migrated datasets Conduct … migration within complex environments Strong background in financial services , ideally wealth or asset management Advanced SQL skills , with the ability to independently analyse complex legacy code Demonstrated experience in: Source-to-target mapping Data lineage documentation Migration validation and reconciliation Familiarity with medallion architecture principles Strong documentation skills ...

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 ...

development expertise: Kotlin, Jetpack Compose, Coroutines, MVI architecture, and REST API integration Testing, debugging & performance skills: JUnit, bug fixing, performance optimization, and working with Legacy code Modern development practices & tools: CI/CD (GitHub Actions, CircleCI), Gradle, async patterns, and collaborative agile teamwork Contract Details: This position will ...

engineering team and work directly with the CTO on the systems that sit at the heart of the product. This isn’t about maintaining legacy code or picking up tickets. It’s about building, improving, and scaling a platform that directly impacts customer experience and revenue. The environment ...

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 ...

configuration). Contribute to the end-to-end delivery of a bespoke research and risk assessment tool built in Dynamics. Write, review, and validate code written in C#, ensuring alignment with development standards and governance. Work across both project delivery and BAU, including backlog ownership and triage support. Collaborate … software development, with strong exposure to Microsoft Dynamics and Power Platform. A solid development background in C# .Net, with the ability to understand legacy code. Experience delivering custom Dynamics solutions (not just configuration/customisation). Understanding of Power Platform (Power Apps, Power Automate, etc.) Experience working in project ...