Huge variance between dept. and team. check specifically.
How common is it to work after hours and on weekends?
Specifics dpend on the team. But yes, very flexible. Most WFH every Wednesday. You make your own hours, as long as you deliver. I spend 40hrs/wk in the office including gym and lunch.
Which team/location?
I'm in MPK, don't want to say team.
For Chinese heavy teams, WLB is nightmare
How's culture and wlb at RTP in INFRA team in MPK? How much can you wfh?
Yes you can