Stelio Buono
Full Stack Developer · SvelteKit / React / Node.js
7 years of experience on critical systems, SaaS products and serverless platforms. SvelteKit, React, Node.js. From Xavier Niel's team to co-founding Zonor.
Sauxillanges, Puy-de-Dôme, France
Biology first,
then code
It all starts with a fascination for the living — a Master's degree in Aging Biology at Université Paris Diderot.
Modelling complex biological systems requires the same rigour as a well-designed algorithm. The click was there: build rather than analyse. A radical switch to software development — with École 42 as the launchpad.
This scientific detour shapes a way of thinking: break down complex problems, find the invariants, never accept a solution that doesn't hold up under scrutiny.
Université Paris Diderot → École 42
The school
without teachers
No classes, no teachers — only problems to solve and fellow students to progress with. Peer learning, intensive projects, total autonomy from day one.
I beat the faculty champion in an algorithmic arena tournament.
Recruited by Xavier Niel
Full Stack Developer — ITSF
- ▸ Founding member of a tech expert group assembled by Xavier Niel — single client: Salt Telecom (Switzerland)
- ▸ Delivered 2 high-compliance projects: number portability between Swiss operators and Legal Interception
- ▸ Designed and implemented critical REST APIs running 24/7 in production for a national telecom operator
Building from scratch
Senior / Lead Full Stack Developer — Viaco
- ▸ Architected and built from scratch a platform for construction companies: subcontractor management and digital worksite dashboard
- ▸ Full serverless deployment (AWS Lambda, KeyCloak, ElasticSearch) from technical design to production
- ▸ Mentored a junior developer with full technical autonomy across the entire project
Taking care
of what matters
"A period outside of time to care for a loved one.
Some things come before everything else."
The live music ecosystem
CTO & Co-fondateur — Zonor
- ▸ Co-founded and architected a SaaS event management platform for the live music industry in France, from scratch
- ▸ Full technical leadership: infrastructure choices, product roadmap, feature-by-feature development
- ▸ End-to-end modern stack: SvelteKit, Supabase / PostgreSQL, Drizzle ORM, continuous deployment