Senior Backend Engineer — AI Platform Systems

Capsa in London is seeking a Senior Fullstack Engineer to own the backend powering an AI platform used by leading PE firms. You will design and build scalable services, implement agentic workflows, document ingestion, search, and APIs, and take features from idea to production.

You will work across the stack with startup veterans, receive meaningful equity, and have the opportunity to ship impactful systems at pace in a high-performance environment.