Phone interview with hiring manager. Two on-sites interviews with 4-6 one-by-one interviews each . Had to sign NDA for the on-site interview and to pass security check points. I was not shown the labs only offices. Uncomfortable when two high-ranked interviewers asked me to talk about personal life, family size and go through my relatives. Everything else was as expected. Two weeks after last interview got an offer. Negotiated it and got an offer with 10% increased.