A recruiter reached out to me through email for a data scientist position. I was not sure if I wanted to work at fb at the beginning. So the recruiter let me join a facebook hosted event where I could talk to some team members, which is nice. However, I didn't like the people I talked to. For some reason I get the impression that they are not very friendly and they don't seem to provide much mentorship at work. Anyway, I still decided to start the interview process. First round is a phone interview with a data scientist. She asked me some sql questions. I would say it is medium level difficulty. Then one programming exercise, which is like leetcode easy level question. Then I went to the onsite interview. 1st round: Interview with 2 data scientist. Mostly sql questions. It covers topic like row_number, case, joins. Then follow by simple data analysis questions where you need to check the data distribution. 2nd round: interview with another data scientist. 1 medium to hard level sql questions. Then she started to ask me some ab testing questions. I told her that I never did any ab testing at work, but I guess she thought I should have known it. Well I tried my best to tell her my answer, then she started to told me something like "oh you need to read your book. You didn't prepare at all". I was like okay sorry I didn't know the answer. Even though I didn't want to take it personally, but that is a really hostile comment. 3rd round: coding exercise with 2 data scientist/ engineers? They asked me 2 questions. 1 for array partition and 1 for counting the word frequency in a file. Not too difficult. But you need to ask for details on the requirement. Then I had lunch with recruiter at noon in campus. 4th round: interview with hiring manager. Mostly business questions and behavioral questions. 5th round: interview with product manager. All he asked was behavioral questions. I had to say those are the most weird questions I got asked. One question is like "do you have any experience where your job is completely different than in the job description". I told him sometimes I will work on different projects. Then he said "oh I am asking do you have experience of working on a completely different role". This sounds like a red flag to me. I mean if you hire a data scientist but she ends up doing PM or developer work, that is not a good thing. I cannot imagine why a company will want to do that. But it sounds like this is something that happened in facebook based on our conversation. I really don't understand what is the intention of this question. Overall, I don't like facebook's culture. I know people in facebook are very smart, but I don't think I will ever want to work at facebook. Not a very friendly work environment.