Total of 5 round, 1 screening round consist of coding and OS question, 4 techs round consist of coding, OS, design, architecture, cultural fit. I was referred by a friend, each round was mix of coding and systems question and question were easy to medium category, for coding question they don't actually need you to write an executable code but rather more interested in your approach and thinking. They are also interested in how deep your knowledge is in fundamentals