I had 5 rounds of interview. The first round is a gate-keeper round, which I cleared to get into a full-day interview process (which have atleast 4 rounds of interview). The interviews are basically technical - algorithm and data structures. The difficulty level of the interview keeps increasing, and steeply at times. The first three rounds are simpler, while the last two rounds are more difficult and are focused on trying to exactly map out the individual's strengths and weaknesses. (I got through the first 4 rounds, but did not clear the last one) The interviewers are pretty open to giving hints and helping you out in solving the problem. Apart from the solution itself, I feel that positive approach, openness to reconsider, and think through the solution are also important aspects. Preparing for the interview with online interview questions helps, but the experience of the interview is truly new. The level of questions can be easily jacked up, so it helps to prepare, but stay calm and actually think in the interview. I also felt that they need to be re-assured that you enjoy the process of solving, and can actually do this effectively. They also are very keen on accurate self-assessment.