Initial phone call screening by hiring the manager, a couple of technical questions (networking and generic) and a couple of coding questions (which were trivial if you have done leetcode/ctci). Later was called to the onsite interview. Had like 4 rounds of interview all technical and involved whiteboard coding (has to be best run time) . At last had system design question round (which surprised my frankly). At end of the round, the interviewer was too rude to me and said it on my face that they are not happy with my performance.