Java / Microservices / API design / LLMs / AI / Claude Code / Copilot

Company: Financial Services

Location: London - Hybrid 3 days per week

Rate: £575

IR35: Outside

CORE BANKING AND TRADING SYSTEMS EXPERIENCE ESSENTIAL

Join a newly formed Service Modernisation & AI team driving AI-first software development in financial services. This is a hands-on role modernising high-impact legacy services while building AI-powered engineering workflows.

What You'll Do

* Modernise critical legacy Java services using AI-driven analysis and refactoring

* Apply migration patterns (e.g. strangler fig) to deliver clean, modern APIs

* Ship improvements in fast cycles with measurable gains in performance and reliability

* Build AI-powered tooling, including MCP servers and AI-assisted CI/CD pipelines

* Demonstrate how AI transforms developer productivity and code quality

What We're Looking For

* 6+ years' backend engineering experience (Java)

* Proven experience modernising production systems at scale

* Hands-on use of AI development tools (e.g. Claude Code, GitHub Copilot, LLMs)

* Experience with MCP, AI automation, or agentic AI systems

* Strong understanding of microservices and API design

Java / Microservices / API design / LLMs / AI / Claude Code / Copilot