No 401k (yet, but company stock more than makes up for it... if you get it). Culture doesn't really provide an opportunity to slow down and reflect or methodically work through a problem. It's all go go go go go. I am luck with the group I'm in supporting a "slower" more thought-out, methodical process. It really adds ballast to what would otherwise be an imbalanced culture. That's going to be group specific though. Your manager will allow the space for work/life balance... or not.