Senior Software Engineer (C# / JavaScript)

Imagine joining a highly profitable, bootstrapped global tech Start-Up that 10x’d its revenue last year. They build cutting-edge, LLM-powered workflow tools that supercharge complex research and decision-making for the world’s absolute top-tier investment and consulting firms. Their platform already powers hundreds of billions of dollars in annual investments. They are looking for a high-ownership Senior Backend Engineer to join their London team. You will architect and scale the very systems, AI infrastructure, and data pipelines that power their rapid expansion What You’ll Tackle: This is a high-leverage role where you will translate complex business problems into clean, high-performance automated systems. You will: Architect & Scale AI Infrastruct ure: Build backend systems supporting high-throughput LLM interactions, vector search, and multi-agent orchestration Own Data Systems Drive Automation: Stitch together model providers, data stores, and internal APIs to create cohesive, performant data pipeline Shape the Cult ure: Have a massive voice in internal infrastructure decisions and their evolving engineering culture and we will be building a team around this hi Who You Are: Expe rience: track record of owning technical projects end-to-end (from architecture to production Tech Stack: Strong production coding skills in either Python or TypeScr ipt, alongside deep experienc e with PostgreSQL Londo n Base - 5 days a week on SITE Mindset: You thrive in fast-moving startup environments, enjoy shipping quickly without sacrificing engineering standards, and love making teams dramatically more efficient Bonus points if you have experience building AI-enabled workflows, automation systems, or internal developer platform If this sounds like the right opportunity for you, apply and let's talk