theo serieys

I’m a product-minded full-stack engineer with 9+ years of experience, from solo end-to-end ownership as a freelancer to leading engineering roles in product teams. I’m strong across the stack—React/Vue/TypeScript on the front and Node/Symfony on the back—with a consistent focus on API design. For the past two years, I’ve centered my work on making AI genuinely useful in production.

At Sellsy, I rebuilt the invoice OCR pipeline, replacing Mindee with a Mistral LLM-based solution and becoming the primary owner of the implementation. I designed the LLM reliability layer for OCR (automatic reconciliation, a second cleanup pass for hallucinations, and a human-in-the-loop verification screen) and rolled out Claude Code across the engineering team for reliable adoption.

Earlier, at Elemate Technologies, I built a 0-to-1 AI Process Generator (Notion connection → process spec → auto-generated structured Notion pages with programmatically generated diagrams) and led the migration from jQuery/Symfony to Vue 3, while optimizing performance and automating production releases with bash CI/CD. As a freelancer, I’ve delivered end-to-end products like an order-management tool for France Fleurs that moved a business from paper to digital and achieved 3× productivity, plus REST APIs for Guarani used by corporate lawyers.