Szymon Rybczak
FounderFounder at TesterArmy
San Francisco, California, United States
FoundedTesterArmy · YC
About
Szymon Rybczak is co-founder and CEO of TesterArmy. He has contributed to React Native and maintained open-source libraries, and previously worked on v0 iOS with Vercel.
Founder at TesterArmyYC X26
Intro paths
YC
Szymon went through Y Combinator (Spring 2026) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Pete Koomen, General Partner at Y Combinator — the partner who ran TesterArmy's batch and knows the company first-hand. YC profile ↗
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In turn, Szymon can intro founders to TesterArmy's investors below.
TesterArmy's investors · 1
Co-founders at TesterArmy
OK
Oskar KwaśniewskiFounder
Experience
- TesterArmy (YC P26)Co-Founder & CEOcurrent2026 — presentRejon Zatoki San Francisco
- CallstackSenior React Native Developer2022 — 2026
- MyMusicReact Native Developer2021 — 2022
- LiveKidMobile Developer2021Cracow, Małopolskie, Poland
Frequently asked questions
- Who is Szymon Rybczak?
- Szymon Rybczak is co-founder and CEO of TesterArmy. He has contributed to React Native and maintained open-source libraries, and previously worked on v0 iOS with Vercel.
- Where does Szymon Rybczak work?
- Szymon Rybczak is Founder of TesterArmy.
- What companies did Szymon Rybczak found?
- Szymon Rybczak founded TesterArmy.
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
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+ 8,766 more
