e2e raises €7M to build open-source testing for the AI coding era

What's the deal? e2eDealroom has a profile for this one. Try Dealroom →, a startup based in San Francisco and Warsaw, has raised €7 million ($8 million) in seed funding to build an open-source framework for testing web and mobile applications. The round was led by Credo Ventures, KAYADealroom has a profile for this one. Try Dealroom →, Point Nine, Baobab VenturesDealroom has a profile for this one. Try Dealroom →, and Script CapitalDealroom has a profile for this one. Try Dealroom →, with participation from Snowflake co-founder Marcin Żukowski and Uber co-founder Oscar SalazarDealroom has a profile for this one. Try Dealroom →.

Why now? The round comes just three months after a €1.05 million ($1.2 million) pre-seed, bringing total funding to €8.05 million ($9.2 million). Earlier backers include Y Combinator, Vercel founder Guillermo Rauch, and Cognition co-founder Walden Yan.

What's the endgame? Co-founders Szymon Rybczak and Oskar Kwaśniewski started the company in early 2026 as TesterArmy, an AI agent that tested applications for other teams. After running it for customers, they concluded that improving existing tools was not enough and rebuilt the underlying framework from scratch as open source, phasing out TesterArmy.

Since launching on October 1, e2e reports more than 1 million downloads, over 12,500 GitHub stars, and more than 10 million tests run. Both founders are longtime open-source contributors, known for their work on React Native.

What the money is for: e2e plans to expand its engineering team, grow its open-source community, and build infrastructure to run end-to-end tests at scale, expected to launch in 2027. The framework will stay free and open source, with revenue coming from testing infrastructure, enterprise deployments, and related services.

"Software development is moving into the era of verification engineering," said Rybczak, co-founder and chief executive officer. "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 signal: AI-driven software testing is drawing fresh capital as coding tools speed up development and raise demand for reliable verification. Zurich-based Klarent raised $8 million in October, while Blacksmith's $45 million August round valued it at $550 million. In a crowded field where cloud and developer-platform giants are also building testing into workflows, e2e's open-source bet marks a sizeable Polish round in a fast-growing category.

Read more: therecursive.com

Image credit: craigdietrich