5 of 5 Legacy Code Jobs in London

workflows, including model selection, prompt and harness engineering, tool integration and reusable skills. Support the adoption of AI across the SDLC, including test generation, code review, documentation, legacy code understanding and modernisation. Run structured proofs of value with clear hypotheses, baselines, success criteria and evidence-based outcomes. … integrating agents with tools and services. Strong prompt engineering and harness engineering experience. Experience with AI coding and agent tooling such as Claude Code, GitHub Copilot, Codex, Kiro or MCP. Knowledge of applying AI across the software development lifecycle. Experience defining engineering standards, guardrails or practices adopted across multiple ...

stability and performance. Collaborate with cross-functional teams, including PO, PDEF, QA, DevOps, and product stakeholders, to define, design, and deliver new features. Refactor legacy code and participate in technical debt reduction. Write clean, scalable, and maintainable code with proper documentation. Participate in code reviews ...

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 ...

Back Office Change function, focused on modernising a range of FIS-based back and middle office systems. You'll be working hands-on with legacy code, bringing systems up to current standards, while working closely with database and reporting teams and collaborating downstream with Front Office on changes … what, why and how. What You'll Be Doing Modernising and maintaining FIS-based back/middle office systems, working across a varied legacy tech landscape of differing ages and complexity Delivering a mix of small incremental changes (typically 2-week cycles) and larger project work Engaging directly with ...

Back Office Change function, focused on modernising a range of FIS-based back and middle office systems. You'll be working hands-on with legacy code, bringing systems up to current standards, while working closely with database and reporting teams and collaborating downstream with Front Office on changes … what, why and how. What You'll Be Doing Modernising and maintaining FIS-based back/middle office systems, working across a varied legacy tech landscape of differing ages and complexity Delivering a mix of small incremental changes (typically 2-week cycles) and larger project work Engaging directly with ...