1st Round was coding round with a medium hackerrank problem to solve 2nd Round was system design round The next 2 rounds were taken by team in US Again the 3 round was coding and 4th Round was system design The interviewer in the 4th round asked me to design a parking lot and I was able to deliver the class diagram and db design . He then asked me which database I should use if there are millions of requests. I tried to explain myself and come to a point but he said he had a meeting to attend to and left without a word. I was a bit annoyed with his behavior. System design round should be an open discussion and instead of discussing the approach with me he just left 5 minutes before the interview end time. I dont know if they are looking for super humans to do their job and they themselves lack basic interview etiquettes. They wasted more than 4 hours of mine leaving me exhausted and anticipating for feedback which I got the next morning that I am rejected. I solved all coding problems in 2 coding rounds with all the test cases passing. Also I discussed ways to optimize my approach . I also cleared the first system design round but things didn't go well in the last moments of 4th round where the interviewer left 5 mins before letting me explain my approach. It was a complete waste of time appearing for their interview process.