guillaume fossier
I build the systems other teams either can't or won't — automation, scrapers, internal SaaS, AI tooling. Shipped in weeks, not quarters. No agency overhead.
## about
I'm a French fullstack engineer working solo for product teams and small companies. My sweet spot is the layer that makes a business actually run: the scraper that powers the sales report, the internal admin no client will ever see, the AI pipeline that turns unstructured input into structured output other teams can build on.
I'm comfortable owning a system end-to-end — infra, backend, frontend, and the boring parts in between. EN & FR. Reply within 24h, plain text, no funnels.
## focus
Scrapers that survive third-party redesigns. ETL pipelines. Internal bots. The unglamorous infra that keeps operations running.
Custom apps with auth, payments, admin dashboards and the edge-case handling no-code platforms quietly give up on.
LLMs wired into real workflows — RAG, structured extraction, MCP servers, AI-augmented tooling. Production, not demos.
## selected work
Tech-stack recommendation engine with a deterministic scoring core and an MCP server so other agents can query it.
Internal app for a non-profit supporting youth with disabilities. GDPR-compliant handling of health-adjacent data, role-based access.
Full property-lifecycle platform with admin dashboard, automated photo pipeline and a 98 / 100 Lighthouse score in production. No longer live.
Windows services in C / C++, automation bots, Raspberry Pi OS upgrades. Small, sharp, paid jobs with repeat-customer reviews.
## stack
## background
Trained in game development. Games teach you that if a player doesn't get it in three seconds, they leave. That bar carries over to every product I touch.
Then worked in scientific research. Research teaches you to take a problem apart until each piece is small enough to be wrong about cleanly — which is most of what good debugging actually is.
Now freelance fullstack: automation, internal SaaS, AI integration. Mostly solo, sometimes embedded in a product team.
## availability
## references
"Lots of smart back-and-forth between Guillaume and my team. Clear competence. Good ideas. Easy, enjoyable collaboration."
"Excellent work. Takes the time to explain things clearly, listens carefully — really makes you want to work with him again."
"Job very well done. Pro, fast, efficient. Recommend."
5★ across 20+ engagements → codeur.com/-hoklims