There are 2-3 rounds of interviews, the final one at the office and rest telephonic. There is no structure to what the different rounds are. In my case, the 2 rounds I went through were almost identical. A very senior guy in the analytics team took my first round, and he had no clue what he was asking. He asked some random overused puzzles, and some outdated technical questions. No questions were asked about my very relevant experience.