About
Robin Carivenc, web developer in Hochstatt, Haut-Rhin, France. I work alone, trading as CR Entreprise.
I deliver and maintain client sites in production, and I run a product with its own customers, billing and agent. The same person writes the code, answers when something breaks on a Sunday, and explains why one choice was made over another.
The range is the proof. A forty-three-page roofer's site written without a framework and a real-time back office in TanStack Start do not call for the same tools; knowing how to move between them, and which one to pick, is what I sell. Not speed, not price.
What I don't do: promises nobody can check. There are no invented reviews on this site, no rounded-up revenue, no borrowed client logos. What is online is online, what is switched off is marked as switched off.
Method
Design notes
The simplest thing that holds
A forty-page brochure site does not need a framework. A booking flow with payment and calendar sync does. The tool follows the problem; the reverse produces sites nobody dares touch two years later.
What is delivered is maintained
A site delivered and then dropped, and a site kept up, do not tell the same story. The upkeep state of every project is written on this site, including when the answer is “archived”.
Constraints get named
Shared hosting with no Node runtime, a demo subdomain going dark, a plugin breaking: these are the real conditions of the work. They are written down rather than hidden, because a client who knows them decides better.
Skills
Tab. 1 — areas and tools
| Symbol | Area | Tools used in production |
|---|---|---|
APP | Applications and products | TypeScript · React · Next.js · TanStack Start |
DATA | Data and real time | Supabase · Convex · PostgreSQL · Edge Functions |
PAY | Payments and accounts | Stripe · Better Auth · OAuth Google |
WEB | Framework-free sites | HTML · CSS · JavaScript · schema.org |
SEO | Local search | Pages ville · données structurées · Search Console |
LLM | Agents and automation | claude-haiku-4-5 · Gmail API · iCal |
OPS | Deployment | Hostinger · Vercel · Coolify · Apache |