I had 4 rounds, all telephonic. Was called over to Virginia for an in person interview. Very organized process, had one on one interview with a lead engineer, a panel interview with 5 senior managers and final interview with the manager. Company paid for the travel and stay. Unfortunately, I was not offered the position. Had a wonderful experience overall. Good people around and good ambiance to work. Happy to have interviewed at my dream company though I did not get an offer. Wish you the best for your interview.