Founding AI Backend Engineer
FinTech | UK | Remote-first | £80K-120K + equity
We’re hiring a Founding AI Backend Engineer to help shape the technical foundations of an early-stage fintech building AI-native systems in a complex tax and compliance domain.
This role is for someone with a consistent track record of building backend and LLM systems from scratch, who can drive technical direction from day one, not just contribute tickets.
What you’ll do:
* Design and build production-grade backend systems for AI-native products
* Build LLM systems end-to-end: agentic workflows, RAG pipelines, eval frameworks
* Design data pipelines for processing unstructured data at scale
* Make architectural decisions that balance speed, reliability, and correctness
* Own core systems from initial design through to production
Tech stack:
* Backend: Python, Go, or Node.js (strong depth in at least one)
* AI/LLMs: Agentic systems, RAG, tool calling, evaluations, LLM orchestration
* Data: APIs, pipelines, structured & unstructured data
* Infra: Cloud-native environments (AWS/GCP/Azure)
What we’re looking for:
* Strong backend-first engineering background
* Proven experience building LLM systems in production (not just prompting)
* Experience designing complex systems and making architectural calls
* Comfortable working in ambiguity and driving technical direction
* CS degree not required, but demonstrable systems depth is
If you want to build real AI systems, not demos and help define the technical foundation of a product from day one, this one’s worth a conversation. Apply now!