Senior Backend Engineer

You knew how to code before Cursor and Claude Code - and you know exactly when to lean on them and when not to.This role is about owning the foundational systems of an AI platform, not just hooking up CRUD routes.Seed-funded, founded 2023 with strong traction already trusted by top-tier institutions across four countries and now entering the growth phase.They just rewrote their entire architecture from the ground up and shipped it. Now they need someone to own what comes next.You'll own the full lifecycle of the new build - API design, data modelling, deployment, observability. Real end-to-end ownership of the systems powering the product.The hard problems are the point. You'll design AI pipelines that extract text and visual data from documents and map concepts into knowledge graphs.Stack: TypeScript; PostgreSQL via Supabase; Cloudflare, Google Cloud (Gemini, Cloud Run); Vercel AI SDK.2+ years engineering experience with strong TypeScript. Startup-tested.You don't need every tool on that list from day one - we trust you to pick things up fast. Bonus if you've touched authz, infra/devops, or Next.js/React.Suitable for high-agency builders who want total ownership and the hardest technical work on the platform - not work-life balance.Low ego, high self-worth. You operate like everything is your responsibility, because it will be.€90k base + package. Full-time, in-person in Berlin.No CV required to start the chat.Message Kieran on LinkedIn to fast track.