2 one-hour basic phone interview, 2 4-hour technique interview with 9 engineers, I spend roughly one month for the interview, the HR is really nice. I can get the feedback usually 3~5 days after the interview.

First interview with hiring manager and then onsite. A 3-year-experienced guy did my interview as a 20+ year experience and got rejection after 2+ weeks. The questions were mostly simple but got rejection anyways. I will stay away from this company.