quality assurance tester

https://thebrowsercompatibilitystore.juniperbrief.com/posts/why-browser-compatibility-testing-still-matters-in-modern-web-development

A quality assurance tester is the person who spends hours clicking through an app or website, trying to break things before users do. They methodically run through test cases, but also explore random paths, looking for glitches, crashes, or unexpected behaviors. It's a mix of curiosity, patience, and attention to detail, because finding a small bug early can save a company from a major headache later.