I was first contacted by a recruiter then I applied through an internal reference which allowed me to accelerate the process due to the fact that I already have multiple offers. I interviewed with a specific team that required very deep knowledge in their domain as they are looking to fill a senior position. I was able to get an on-site scheduled by quickly. The interviewed consisted of 5 rounds. One of the rounds is discussing previous experience and behavioral type of questions with the hiring manager which is pretty standard. The other rounds are highly technical, and the questions they asked are quite difficult. Everyone I had a chance to meet was very professional and truly a pleasure to interact with. At the end of it, I felt that it was very mentally challenging but rewarding, like you just exercised every single brain cell. Due to the NDA I am not going to share the questions but they were all fair games and every interviewer was very reasonable with their expectation. Overall I feel that interview process was great and everyone was highly professional from the recruiters, interviewers, to the hiring manager.