Piotr Matyjasik is Co-Founder and CPO at TesterArmy (YC P26), an AI-powered QA agent that tests web and mobile apps the way a real user would, backed by Y Combinator.

Piotr studied Computer Science at West Pomeranian University of Technology in Poland, and gained professional engineering experience at Fujitsu, where he was recognized for his versatility across frontend, backend, and SQL domains.

Piotr co-founded TesterArmy alongside Oskar Kwasniewski, his former classmate from computer science studies, and Szymon Rybczak, bringing together a team with deep roots in open source and developer tooling.

The TesterArmy team collectively spent years shipping web and mobile products used by millions, spanning open source contributions, developer tools, and production applications.

TesterArmy was accepted into Y Combinator's P26 batch and is based in San Francisco, attracting signups from Fortune 500 companies and helping development teams catch regressions and UX issues that traditional code review misses.