Lucky you. I've heard that Google was pretty relaxed. I've just started working in a big tech company myself. It's a bit early to tell but so far, I find that my colleagues are good (probably better than me) and efficient. It's not especially stressful yet, in the sense there are no hard deadlines or anything really critical, and the project is super interesting. But I can tell that if I were slacking, that would show and I wouldn't compare favorably with them. And it seems everybody is quite anxious with performance evaluations.