All posts by
Małgorzata Kozłowska

Dec 22 2025

The Seven Deadly Sins of Test Automation

I’ve spent a significant part of my career building and maintaining test automation suites, and I’ve learned one thing for certain: a test suite that isn’t trusted is worse than no test suite at all. We’ve all felt that familiar dread of a CI/CD pipeline that’s constantly red, where the team spends more time debugging flaky tests than shipping features. If you’re a test automation engineer or a developer feeling the pressure of a complex and fragile test suite, this post is for you. It’s a confession, a guide, and a collection of hard-won lessons I’ve learned throughout my career on how to pull our test suites back from the brink.

Nov 12 2025

Test-Driven Christmas — A Guide to the Advent of Code Mastery

It’s 6:00 AM on a dark, cold December morning. For many, the only motivation is the first cup of coffee. For me, it’s the quiet, thrilling anticipation of a gift about to arrive. My screen glows in the dark, not with work emails, but with the day’s new puzzle from the Advent of Code. As a Senior Test Automation Engineer, my career is built on a foundation of structure, quality, and a healthy obsession with finding flaws before they become problems. As a Christmas enthusiast, I believe the season is about joy, tradition, and persistence. Most people would see these two worlds as separate. I discovered they are the secret ingredients to a top-10 finish in the world’s most beloved coding challenge. My 7th place finish in 2024 wasn’t a holiday miracle — it was the result of a “Test-Driven Christmas”, a methodology that fuses professional discipline with festive passion. This guide will break down that approach and show you how a tester’s mindset can help you master the daily puzzles and embrace the true spirit of the event.

Małgorzata Kozłowska

By day, Małgorzata debugs code as a Senior Test Automation Engineer. By night, she’s a certified baker perfecting recipes. She believes in elegant solutions, whether it’s in a complex script, an Advent of Code puzzle, or a Christmas pudding.