Senior FastAPI Engineer

We’re working with a fast-growing AI company looking for a Senior FastAPI / Python Engineer to take ownership of the backend powering its AI products. You’ll build the APIs, data pipelines and orchestration layer connecting the product with LLMs, working across retrieval, tool-calling, response streaming and long-running background jobs. This is far beyond traditional CRUD development — you’ll be solving complex problems around AI reliability, performance, scalability and confidential data, with genuine ownership over architecture and technical decisions.

Must Haves

7+ years building backend systems in production

6+ years Python

3+ years FastAPI

Strong PostgreSQL / SQL

2+ years Redis

Strong experience designing and building production APIs

Experience with async / distributed systems and background processing

Strong understanding of reliability, scalability and production performance

Comfortable taking end-to-end ownership of backend systems

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 LLM-powered applications

RAG / retrieval systems

Vector search / vector databases

AI agents and tool-calling

LangChain or LlamaIndex

SSE, WebSockets or other streaming technologies

Document ingestion and embedding pipelines

Microsoft Graph

Email integrations

Experience integrating with external document/storage platforms

Experience handling confidential data within production AI systems