Roman L.

I build production web products end to end — and the AI features inside them. Senior full-stack engineer, 10+ years. Next.js, React, TypeScript, Node.js / NestJS, PostgreSQL. Former frontend lead at PitchBook and Resident. What I do best: • AI features that do real work — chatbots, RAG over your own data, AI agents with tool calling, semantic search. Recent: rebuilt an AI matching engine with ~3× better top matches at lower LLM cost. • MVPs and proofs of concept — from idea to a deployed, observable product. • Rescue and fixes — root cause found, test written, done. Proof, not promises: on my own product (a blockchain prediction market) I cut sync time from 42 s to 6 s and keep ~2,800 automated tests green. How I work: architecture first, typed end to end, decisions by numbers. Clear written updates, EU-based with full UK overlap and 4+ hours with US East. Fixed-price options are in my Project Catalog below — or message me with what you're building.