Contract - Senior/Principal Java Developer (London Area)

Principal Java Developer – Major Financial Institution

London / Hybrid | Contract | £700-£800 inside IR35 (gross umbrella rate)

We’re working with a major financial institution looking to scale out its engineering function with a Principal Java Developer to lead critical systems work. This is a hands-on role within a high-performing team modernising legacy platforms, improving availability, and delivering new functionality across the estate.

You’ll be working closely with infrastructure, architecture, and infosec teams to support high-availability production systems. The role also involves guiding CI/CD improvements, REST API design, and steering collaborative technical decisions across squads.

What they’re looking for:

• Proven experience supporting large-scale, business-critical systems
• Strong background in Java and ideally C#
• Some front end exposure (Angular ideally but other frameworks considered). Note the role is back end focused.
• Comfortable working with legacy systems and large enterprise environments
• Confident leading technical conversations across multiple engineering disciplines
• Experience with CI/CD pipelines and modern deployment practices
• Greenfield REST API design including HATEOAS implementation

Bonus points for:

• Angular, React or frontend exposure
• Familiarity with Snowflake or backend SQL variants

This is a great opportunity for an experienced Java Developer to join a prestigious financial player. If you’re someone who thrives in complex environments and enjoys technical leadership alongside delivery, apply now.