e2e raises €7M seed to test code written by AI agents
Polish-American startup e2e, formerly TesterArmy, has closed a €7 million seed round led by Credo Ventures to build an open source testing framework for the age of AI agents.
Polish-American startup e2e, previously known as TesterArmy, has closed a seed round worth €7 million (about $8 million). Credo Ventures led the round, with participation from KAYA, Point Nine, Baobab Ventures and Script Capital. Angel investors include Snowflake co-founder Marcin Żukowski and Uber co-creator Oscar Salazar.
The deal brings total funding to €8.05 million (about $9.2 million), only a quarter after a pre-seed round backed by accelerator Y Combinator. The company is built by two Polish developers from the React Native community: Szymon Rybczak, the youngest ever contributor to React Native's code at 16, and Oskar Kwaśniewski, who has made more than 100 changes directly to its core.
A commercial product switched off
The pair first built TesterArmy, a platform with an autonomous agent that runs software tests. It attracted more than 70 paying customers, yet the founders shut it down and rewrote the architecture from scratch. A closed platform did not let teams keep test scripts in their own code repositories, limited the choice of language models and tied users to external infrastructure.
The result is an open source engine in TypeScript, released on 1 October 2026 under the Apache-2.0 licence. It combines traditional deterministic assertions with flexible autonomous steps. Once a model finds the right interaction path, e2e caches the sequence, so later runs do not consume LLM queries until the interface changes in a way that requires adaptation.
"Software engineering is entering the era of verification engineering," Rybczak says. Agents now write more code than humans, faster than anyone can review it, and when nobody reads code line by line, tests are the only safeguard, he argues.
How it plans to make money
The founders note that coding agents such as Cursor, Codex and Claude Code increasingly influence the choice of tech stack, and they reach for open solutions natively through MCP and integration modules. The framework will stay free. Revenue is to come from dedicated cloud infrastructure for running tests at scale, planned for 2027, and from services by forward-deployed engineers for Fortune 500 companies.
The round fits a broader pattern: according to a BADideas.fund report, AI took the largest share of capital invested in Polish tech projects in the first three quarters of 2026, at €118 million across 21 rounds.
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