My friend referred me directly to the hiring manager and HR contacted me in one week for on-site interview. The on site interview is about 4 hrs long and I would say the interview questions were fair.

Later after I joined the company, I also participated the interview-hire process. Per the process, 3-4 people were required for each candidate and there was a key interviewer assigned. The key interviewer is responsible to write down the review and give the recommendation.

Asked about principle of object oriented design.