About
Ulysse Prygiel is a senior fullstack engineer with over 12 years of experience, seven of which were spent in founding or fractional CTO roles, and previously founded a company through Y Combinator's S20 batch. His work includes writing specifications, interviewing stakeholders, and breaking down projects into shippable units, with a focus on AI-first development using tools such as Claude Code and Hermes.
Founder at OneKeyYC S20
Intro paths
YC
Ulysse went through Y Combinator (Summer 2020) — any YC alum in your network can reach them through the YC community.
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In turn, Ulysse can intro founders to OneKey's investors below.
OneKey's investors · 5
Co-founders at OneKey
CB
Christophe BarreFounder
Experience
- PaidProduct Engineer2026Barcelona
- MacadamSenior Software Engineer2025 — 2026Barcelona
- TandemFounding Front-End Engineer2024 — 2025
- KwentaFounding Engineer2023 — 2024Paris
- DiagnosticRapidCTO on demand & Full Stack Developer2023Marseille, Provence-Alpes-Côte d’Azur, France
- PolyconseilBackend Developer2022 — 2023Ville de Paris, Île-de-France, France
- Vitrum.aiCTO on demand2021 — 2022Barcelone, Catalogne, Espagne
- OneKey (YC S20)Co-Founder & CTO at OneKey2020 — 2021New York, États-Unis
- DeeploopLead Frontend Developer2016 — 2019
- HPSoftware Development Engineer2013 — 2016Région de Grenoble, France
- HPIntern in R&D team2013
Skills & more
PostgreSQLGraphQLReact.js1DigitalOceanTerraformGoogle Cloud Platform (GCP)TypeORMNode.js1Vue.jsNestJSJavaScript1HTML5
+12 more
GitJIRAMongoDBTwitter BootstrapreduxSassMySQLHTMLClaude SkillsFull-Stack DevelopmentTypeScriptSoftware ArchitectureLanguages Anglais · Espagnol · Français
- CLAD — National Instruments
From Ulysse's professional profile.
Frequently asked questions
- Who is Ulysse Prygiel?
- Ulysse Prygiel is a senior fullstack engineer with over 12 years of experience, seven of which were spent in founding or fractional CTO roles, and previously founded a company through Y Combinator's S20 batch. His work includes writing specifications, interviewing stakeholders, and breaking down projects into shippable units, with a focus on AI-first development using tools such as Claude Code and Hermes.
- Where does Ulysse Prygiel work?
- Ulysse Prygiel is Founder of OneKey.
- What companies did Ulysse Prygiel found?
- Ulysse Prygiel founded OneKey.
- Where did Ulysse Prygiel go to school?
- Ulysse Prygiel studied at École des Mines de Saint-Étienne (Master's degree, Computer Science); Centre internationnal de Valbonne (Baccalauréat).
