Senior Fullstack Engineer - AI

Senior Fullstack Engineer - AI Come build AI products end to end - from the API and LLM layer all the way through to the experience users interact with! 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 Department Fullstack Developer Locations Multiple locations Remote status Fully Remote Applicant tracking system by Teamtailor