I work in that city as a QA tester. I can tell you that QA, especially QA game testers are the bottom of the barrel of IT (McDonald's salary, though you work at a desk), so most people don't stay for long and leave in droves. Of course it's not the same people that tested The Witcher 3, but inexperienced youngsters, fresh out of college with a worthless degree (sometimes not even a finished college, yes I am also projecting here, lol). Luckily I worked as QA tester for a 1st party company, the testers were pretty much all good and experienced and the company stopped hiring new people, so a lot of testers with 5+ years of experience remained. The projects were also much smaller. However I heard about Quantic Lab and their shitty practices, it's sad.