Senior Fullstack Engineer - AI
Summary
Senior fullstack engineer at a fast-growing AI company, building production AI features end to end: React/TypeScript on the frontend, Python/FastAPI on the backend, spanning APIs, data, LLM integrations, streaming interfaces, and document-heavy UIs with real ownership of architecture and product.
We’re working with a fast-growing AI company looking for a Senior Fullstack Engineer to build production AI features end to end. You’ll work across React & TypeScript on the frontend and Python & FastAPI on the backend, taking features all the way from idea through to production. Expect to work on everything from APIs, data and LLM integrations through to streaming interfaces and document-heavy UIs. This is a hands-on role with real ownership, where you’ll help shape both the architecture and the product as the company scales.
Must Haves
- 5+ years building and shipping fullstack applications
- React – 5+ years
- TypeScript – 3+ years
- Python / FastAPI – 3+ years
- Strong experience building and designing production APIs
- PostgreSQL
- Redis – 2+ years
- Experience building modern, high-quality user interfaces
- Comfortable owning features end to end – backend through to frontend
- Experience using AI coding tools such as Claude Code, Cursor or Copilot
- Comfortable working in a fast-moving startup environment
Nice to Haves
- Experience building products involving LLMs, RAG or AI agents
- Next.js
- React Query
- Zustand
- Tailwind CSS
- shadcn/ui
- LangChain or LlamaIndex
- SSE / WebSockets and streaming applications
- Experience building document-heavy or real-time interfaces
- Genuine interest in AI engineering and agentic applications
