First they held an online challenge through HackerRank. They gave you 2 hours to complete the most you could of the 7 challenges. They used the hackerrank pointing system (certain tests to your code must pass). If you did well, they called you a week later for some HR questions. Then we had two tech interviews of 45 minutes each. In the first one you review the code of one of your submitted solutions, they ask you some questions about it and then make you expand the functionality of your code. For the next one, they previously ask you to choose from one of the solutions to the challenges (they send you both solutions), and in the interview they ask you to design a small model that would use that code. If you did well, you have a pretty laid-back interview with the V.P of Engineering. A month later they let you know if you got in (they only accepted 10 people this year, I wasn't one of them).