YC Spring 2026 (P26) founder

Oskar Kwaśniewski

Founder of TesterArmy, Test your app with AI, catch bugs before users do

Company

Oskar Kwaśniewski is listed as a founder of TesterArmy. TesterArmy is an AI agent that tests websites and mobile apps. It monitors production on a schedule and runs automatically on every GitHub Pull Request, delivering screenshots, recordings, and actionable bug reports. Describe tests in plain English. The agent handles login flows, OAuth, and OTPs, no scripts to write or maintain. We catch the regressions and UX issues that code review misses.

Founder traction evidence

Public posts and activity attributed directly to this founder.

  1. X

    this is what AUTOMATED UI testing looks like

    this is what AUTOMATED UI testing looks like

  2. X

    A week ago, we launched on Hacker News. We got 131 upvotes and 69 comments. Over 1.5k new users. Here are a couple of learnings about it: • Never use AI to write the post; the HN crowd will notice it. • Make sure your app can be tried for free • Address how it's different Show more

    A week ago, we launched on Hacker News. We got 131 upvotes and 69 comments. Over 1.5k new users. Here are a couple of learnings about it: • Never use AI to write the post; the HN crowd will notice it. • Make sure your app can be tried for free • Address how it's different Show...

  3. X

    YC P26 reunited in Warsaw 🇵🇱

    YC P26 reunited in Warsaw 🇵🇱

  4. X

    the idea for Scout came from a bunch of conversations we had with teams that are shipping external APIs. scout allows you to test thousa...

    the idea for Scout came from a bunch of conversations we had with teams that are shipping external APIs. scout allows you to test thousands of endpoints in a matter of minutes. ship your API with confidence

  5. X

    time to release 1.0 after this

    time to release 1.0 after this

  6. X

    I moved all my coding agents off my laptop to a Mac mini. love the setup so far, using it mostly with tmux and opencode.

    I moved all my coding agents off my laptop to a Mac mini. love the setup so far, using it mostly with tmux and opencode.

  7. X

    design is super important to us

    design is super important to us

  8. X

    Pretty cool thing we added recently, our agent can skip running tests if the changes are not relevant. In the example below, a simple change to AGENTS.md doesn't require a full end-to-end test suite run.

    Pretty cool thing we added recently, our agent can skip running tests if the changes are not relevant. In the example below, a simple change to AGENTS.md doesn't require a full end-to-end test suite run.