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Ulysse Prygiel

Founder

Founder at OneKey

Barcelona, Catalonia, Spain

FoundedOneKey · YC

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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 · 11

Coinbase VenturesSan Francisco · $100K – $10M checks · since 2026DragonflyNew York · $3M – $30M checks · since 2026eCapital Entrepreneurial Partners AGEthereal Ventures Management Ltd.Road Town, Tortola · since 2022Folius VenturesNew York · since 2022Framework VenturesSan Francisco · $250K – $40M checks · since 2022IOSG VenturesHong Kong · $10K – $100K checks · since 2022Momenta VenturesLucerneRibbit CapitalPalo Alto · $2M – $15M checks · since 2026Sky9 CapitalSan Francisco · $1M – $10M checks · since 2022Y CombinatorSan Francisco · $500K checks · since 2020

Co-founders at OneKey

CBChristophe Barre
Christophe BarreFounder

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.

Founder mafias

About this profile. Compiled from public sources — OneKey's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights