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# YC Proven TesterArmy Raises €1M for AI Agents That Test Software
- URL: https://www.therecursive.com/yc-proven-testerarmy-raises-eur1m-for-ai-agents-that-test-software/
- Published: 2026-09-15T07:56:34.000Z
- Updated: 2026-09-15T07:57:56.000Z
- Description: The San Francisco- and Warsaw-based startup uses AI agents that follow user journeys in plain language, no test scripts, no source-code access, and raised its pre-seed from Y Combinator, AIP Seed, Eight Capital, Script Capital and angels including Vercel founder Guillermo Rauch.
- Author: The Recursive
- Tags: CEE, Deals, News, TesterArmy

👯 **Founder(s):** Szymon Rybczak (CEO, co-founder) and Oskar Kwaśniewski (CTO, co-founder)

📅 **Founding year:** 2026 

🏭 **Industry:** Developer tools

💥 **Problem:** AI coding agents now write a growing share of shipped code, but they verify only the feature they were asked to build — broader user journeys and regressions go unchecked as release cycles speed up. Traditional test automation relies on scripts engineers must write and maintain, and interface changes break them; managed platforms add sales calls, demos and weeks of onboarding.

📣 **Solution:** TesterArmy's AI agents open a real browser or launch a mobile app and follow a user journey described in plain language, checking whether each step works. No access to source code is needed — a URL or an installable app is enough — and once connected to GitHub or a CI pipeline, tests run automatically on every change.

👥 **Customers:** Engineering teams from seed-stage startups to Series C companies. More than 50 clients already use it, including Resend, bolt.new, Novu, CodeCrafters, Rork and Nando's.

🎳 **Team size:** 6 

🌱 **Stage:** Pre-seed

💰 **Investment amount:** €1.04M ($1.2M)

🚀 **Funded by:** Y Combinator, AIP Seed, Eight Capital and Script Capital, alongside angels: Guillermo Rauch (founder of Vercel), Walden Yan (co-founder of Cognition, maker of Devin), Charlie Cheever (CEO of Expo, co-founder of Quora), Zeno Rocha (founder of Resend), Fernando Rojo (Head of v0 at Vercel) and Fryderyk Wiatrowski (CEO of Viktor)

💡 **It will be spent on…** growing the team and scaling the platform to serve hundreds of companies.

💬 **In their own words:** Szymon Rybczak (CEO): *"We spent years shipping mobile apps for other companies, so we know that much of testing has nothing to do with writing test scripts. It is the logins, devices and infrastructure. Teams knew what needed testing; they just did not have time to set it all up. We wanted the answer to be simple: describe what should happen, and the test runs."*

Oskar Kwaśniewski (CTO): *"Traditional automated tests follow a fixed script. Our agents work from the user's goal. You can tell them what should happen in plain language, and they adapt as the product changes. We are on a mission to make testing effortless for high velocity engineering teams."*

💪 **Their specialty:** The two founders are Polish engineers who worked together at the music label MyMusic and later at Callstack, one of the largest React Native consultancies. Rybczak has written production code since 14 (starting at edtech company LiveKid) and is described as the youngest person ever to contribute to React Native; he was still in high school when TesterArmy was accepted into YC, flying between San Francisco and Poland to sit his final exams. The agents can handle logins involving email or SMS verification codes, and the first test can run within minutes of connecting.

🔑 **Business model:** Subscription SaaS

💸 **Funding so far:** €1.04M ($1.2M)