Paul Chasseuil
I build AI systems — RAG, agents, MCP — made for production.
Founding engineer at T1U: I designed and shipped most of a SaaS platform and its AI copilot — eight business domains, from CRM to finance, on one data model.
What I built
At the heart of T1U is a copilot that orchestrates the whole business: it understands a request in plain language, plans it across several steps and runs the right action among thousands of capabilities — CRM, email, finance, projects, HR, stock. I joined at the prototype stage and took it to production: I designed its architecture (RAG, agents, MCP server, NL2SQL), set up the team's engineering processes, and own day-to-day maintenance and deployments.
// from prototype to production: evals, benchmarks, LLM cost, tests, CI
Three things, done seriously
Applied AI
RAG, agents, MCP servers, NL2SQL. Evaluation, latency and LLM cost. AI that ships, not vibes.
Full-stack
From the Node/TypeScript backend to React UIs, through data, integrations and payments. The whole product, not just a layer.
Ownership
From spec to production, autonomously. Five years owning projects end to end.
From generalist to the AI frontier
My toolbox
Languages
Frontend
Backend & data
AI & LLM
Infra & tools
Selected work
T1U
AI SaaS platformConversational copilot + a full business suite (CRM, finance, projects…).
Balldontlie
NBA · stats & oddsA site for NBA fans and bettors.
PBOX
File sharingA Dropbox-like app.
“As a client, I really value Paul's work. He's pragmatic and has a very strong technical background.”
Want to talk applied AI, agents, RAG or MCP?
Always happy to talk shop.