San Francisco- and Warsaw-based e2e has raised €7 million ($8 million) in seed funding to develop an open-source framework designed to change how developers test web and mobile applications in the age of AI agents.

The round was led by Credo Ventures, KAYA, Point Nine, Baobab Ventures and Script Capital, with participation from Snowflake co-founder Marcin Żukowski and Uber co-founder Oscar Salazar. The funding comes just three months after the €1.05 million ($1.2 million) pre-seed round, bringing its total funding to €8.05 million ($9.2 million). Previous backers include Y Combinator, Vercel founder Guillermo Rauch and Cognition co-founder Walden Yan.

Since its launch on October 1, e2e has surpassed 1 million downloads, gained more than 12,500 GitHub stars and run over 10 million tests, the company reports.

Rethinking the original idea

Rybczak and Oskar Kwaśniewski founded the company in early 2026 under the name TesterArmy. Their initial product was an AI agent designed to test applications for other teams. However, after running it for customers on a daily basis, the founders concluded that improving the existing testing tools would not be enough. Instead, they decided to rebuild the underlying framework from scratch and make it open source. This led to the creation of e2e, as the company phases out TesterArmy to focus entirely on the new framework.

“Software development is moving into the era of verification engineering. Agents write more code than humans, faster than anyone can check it. And when nobody reads the code, tests are the only check left. The problem is that today’s testing tools were built for a world where people still wrote and reviewed that code. Adding AI features to them is not enough, this calls for a new framework, just like e2e. We are building it from the ground up, in the open, to become the standard for verifying software in this new world,”
— said Szymon Rybczak, co-founder and CEO of e2e.

Both founders are longtime open-source contributors, particularly known for their work on React Native, the framework used by companies such as Meta, Microsoft and Amazon to build mobile applications.

They joined Y Combinator with TesterArmy while Rybczak was still finishing high school, travelling between San Francisco and Poland to sit his final exams.

What the money is for

e2e plans to use the new funding to expand its engineering team, grow its open-source community and develop infrastructure for running end-to-end tests at scale, which is expected to launch in 2027. The company also plans to expand its forward-deployed engineering practice.

The framework will remain free and open source, including for commercial use. Instead, e2e plans to generate revenue through its testing infrastructure, enterprise deployments and related services.

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