Senior Java Developer – Java, AWS, MongoDB, - UK remote, Outside IR35 contract

2 month initial plus extension

We are working with a business who are rebuilding their core platform from the ground up and are looking for a Senior Java engineer who’s up for a real challenge.

Their system was originally built externally, and they've now brought it fully in-house. So, your mission is to get under the hood, untangle what’s there, and help them fix problems within teh code — cleaner, faster, and built to scale. Someone with a forensic mind who is then able to get on with the fix.

What You’ll Be Doing

• Own the project entirely, end to end
• Work across the stack using Java, React, AWS, MongoDB, and Elasticsearch.
• Refactor and re-engineer core components
• Collaborate closely with product and architecture teams.
• Fix existing problems without rearchitecting and redesigning
• You will be comfortable digging into existing codebase, breaking down and tracing the problem
• Form and construct and then reverse engineer the problems

Experience

• Strong experience within the Java AWS stack
• Experience modernising or replatforming legacy systems.
• Familiarity with microservices, CI/CD, or serverless architectures.
• An interest in building scalable, high-performing distributed systems.
• A great understanding of modern software architecture, design principles and data structures.
• Practical experience with Java, React, MongoDB and AWS
• Curiosity and persistence — you enjoy cracking tough problems and simplifying complexity.
• The ability to balance autonomy with collaboration

If this sounds like you then let me know and we can set up a call.

1 stage interview process completed in the next week and immediate start thereafter

£450-£500 per day