Szymon Rybczak

Co-Founder & CEO @ TesterArmy (YC P26)

Co-founder

TesterArmy· Spring 2026 🇺🇸 San Francisco, California, United States

in LinkedIn 𝕏 @SzymonRybczak

2026Co-founder· TesterArmy (YC P26)

Founder · since 2026

Company

TesterArmy (YC P26)

Role

Co-Founder & CEO

current

Stage

—

no public source

Raised

—

no public source

Based

San Francisco Bay Area

current

Founder / co-founder — the company's markEmployee / research role

Source: LinkedIn work history

Profile coverage4 of 7 · missing education, posts, contact

TesterArmy

Test your app with AI, catch bugs before users do

Spring 2026

Experience

Career

TesterArmy (YC P26)
Co-founder
Co-Founder & CEO · San Francisco Bay Area · 2026 – Present
2026
Callstack
Senior React Native Developer · 2022 – 2026
2022
MyMusic
React Native Developer · 2021 – 2022
2021
LiveKid
Mobile Developer · Cracow, Małopolskie, Poland · 2021
2021

Bio

Co-founder & CEO of TesterArmy (YC P26). Youngest ever contributor to React Native (at 16), maintained open-source libraries with 3M+ downloads weekly. Worked on v0 iOS with Vercel. 5+ years of commercial experience. Working professionally since 14.