Full-stack builder · SaaS & AI-era tools
Fullstack developer, founder & consultant based in Paris. I draw up products and companies, then build them to spec — SaaS products, AI-era tools, and anti-hype automation consulting.
Available for freelance projects ← this one actually ships!Note A — Previous life as a Web3 / blockchain consultant. That wing of the building is preserved as-built in the survey archive below. Current works follow.
six structures under active construction — elevations & specifications
| Construction state | Live — early access |
|---|---|
| Materials | Electron · React · Convex |
The workspace built for AI-driven development: run Claude, Codex, Gemini and other CLI agents in parallel across projects — isolated ports, browser identities, terminals and git worktrees. Desktop app for macOS, Windows & Linux.
Visit polystro.com| Construction state | Live |
|---|---|
| Materials | Astro · Cloudflare |
Anti-hype automation ROI consulting for operations teams. “Most agencies sell hype. We sell math.” Measure ROI first, start small, scale only what proves 3×+ returns.
Visit nodiumlabs.com| Construction state | Live |
|---|---|
| Materials | TanStack Start · Convex · Cloudflare |
A CRM intelligence layer that tells sales teams which deals can really sign: deterministic Deal Confidence Score, pipeline confidence map, fragile-deal detection.
Visit foxcloselabs.com| Construction state | Building |
|---|---|
| Materials | Next.js · AdonisJS · PostgreSQL |
A system of record for knowledge: capture, structure and retrieve information you can trust months later. Immutable history, full export, no lock-in.
Visit notarium.app| Construction state | In development |
|---|---|
| Materials | TanStack Start · Fastify · PostgreSQL |
A SaaS for French condominium property managers (syndics de copropriété): per-building accounting, appels de fonds, general assemblies, supplier invoices with AI extraction, owner portals.
Preview sancterius.com| Construction state | In development |
|---|---|
| Materials | Next.js · AdonisJS · PostgreSQL · Stripe |
A production-ready, self-hostable SaaS foundation: auth (MFA, OAuth, SSO, RBAC), multi-tenant teams, billing (Stripe, Paddle, Polar), admin back-office and a plugin marketplace.
Preview saas-backbone.complate A — published volume, mounted for inspection
Practical workflows to stay relevant at work — by Sylvain Tissier
Édition française : « Adoptez l’IA maintenant ou restez derrière »
Most AI advice is hype or prompt lists. This book teaches workflows — how to turn AI into leverage without sacrificing quality: pick the right execution model per task, install trust gates so “fluent wrong” never ships, build reusable assets that compound, and prove value with evidence.
“AI doesn’t replace standards. It multiplies them.”
published notes & contributions — logged chronicles of earlier fieldwork
| Rev | Description of issue | Type | Ref |
|---|---|---|---|
| A | How To Replace Infura With Your Ethereum Full Node | Field note | MD-01 |
| B | Why tokenizing real-world assets on a blockchain is stupid | Critique | MD-02 |
| C | How to simply create Ethereum private contracts that remain enforceable on-chain | Field note | MD-03 |
| D | Contributor, “Mastering Ethereum” (A. Antonopoulos): privacy-enhancing patterns, upgradability patterns, gas refunds | Contribution | ETH-BK |
// All entries issued on Medium — @SylTi except REV D, issued into the Ethereum Book repository.
earlier works — recorded as-built, no longer load-bearing
third-party approvals — stamped upon completion
“He is really nice. He knows what we want, gave us useful suggestions. Good communication, and it looks great! Thanks for the work.”Brian Lee
“Une implication et une organisation projet bien structurée et conforme aux engagements… Prestation d’une grande qualité d’ensemble et respect des engagements.”Jean-Marc Reynaud