Where does Oskar Kwaśniewski work?

Oskar Kwaśniewski is Founder of TesterArmy.

What companies did Oskar Kwaśniewski found?

Oskar Kwaśniewski founded TesterArmy.

Where did Oskar Kwaśniewski go to school?

Oskar Kwaśniewski studied at West Pomeranian University of Technology in Szczecin (Bachelor's degree, Computer Science).

Oskar Kwaśniewski

Founder

Founder at TesterArmy

San Francisco Bay Area

FoundedTesterArmy · YC

Find your path to Oskar

10,158 people in our graph share verified history with Oskar — schools, employers, funds. One of them is your warm intro.

Mauricio OrtizunlockedOskar: together at YC X26 (2026)

×11Oskar: together at Y Combinator

About

Oskar Kwaśniewski is co-founder and CTO of TesterArmy, a Y Combinator company. He has contributed extensively to React Native with over 100 merged pull requests and created multiple open-source libraries. He has worked with companies including Vercel, Meta, and AT&T.

Founder at TesterArmy YC X26

Intro paths

Oskar went through Y Combinator (Spring 2026) — any YC alum in your network can reach them through the YC community.

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, Oskar can intro founders to TesterArmy's investors below.

TesterArmy's investors · 1

Y CombinatorSan Francisco · $500K checks · since 2026

Co-founders at TesterArmy

Szymon RybczakFounder

Experience

TesterArmy (YC P26)Co-Founder & CTOcurrent2026 — presentRejon Zatoki San Francisco
CallstackSenior React Native Developer2022 — 2026
MyMusicReact Native Developer2021 — 2022
eTechnologie.pl - wykorzystaj potencjał Internetu!Frontend Web Developer2019 — 2021Szczecin, Woj. Zachodniopomorskie, Polska

Skills & more

iOS Development1Android Development1TypeScript1Typescript1Angielski1KomunikacjaSwift2Objective-C2Kotlin1Java1iOSAndroid

+10 more

React NativeJavaScriptRESTPHPWordPressCSSSQLReactJSHTML5Git

From Oskar's professional profile.

Frequently asked questions

Who is Oskar Kwaśniewski?: Oskar Kwaśniewski is co-founder and CTO of TesterArmy, a Y Combinator company. He has contributed extensively to React Native with over 100 merged pull requests and created multiple open-source libraries. He has worked with companies including Vercel, Meta, and AT&T.
Where does Oskar Kwaśniewski work?: Oskar Kwaśniewski is Founder of TesterArmy.
What companies did Oskar Kwaśniewski found?: Oskar Kwaśniewski founded TesterArmy.
Where did Oskar Kwaśniewski go to school?: Oskar Kwaśniewski studied at West Pomeranian University of Technology in Szczecin (Bachelor's degree, Computer Science).