Role

We’re looking for a strong Full-Stack Engineer for a Berlin-based AI startup developing a new product in the AI learning and upskilling space. The role is full-time freelance (32–40h/week) with the project running until February/March. We need someone who can start soon and quickly integrate into the existing codebase and team.

You’ll build production-grade web apps with Next.js and Node.js, design robust data models, and ship AI-powered features — especially Retrieval-Augmented Generation (RAG) experiences that are fast, safe, and observable. You should be comfortable owning features end-to-end: from schema design and ETL to type design, vector search, prompt/runtime optimization, and frontend integration

Location / Contract: Berlin / Remote

Experience: 5+ years

Stack: Next.js, Node.js, PostgreSQL, RAG

Must-haves:

• TypeScript, Node.js, Next.js
• SQL (PostgreSQL), data modeling
• Vector databases, RAG (embeddings + retrieval + prompting)
• API design, testing, observability

Nice-to-haves:

• Python, Elastic/Lucene
• MLOps, edge/serverless, GDPR tooling