Phone call to set up a phone interview with their recruiter. Following the phone interview were group interviews with various people in the department. There are about 7-8 interview rounds and during each one there were a lot of repeated questions or the same people interviewing you. Seems like they want to see how you improve from each interview round and any new things you learn about the company along the way.

I was interviewed by a panel of three for the first interview. There was three interviews in total. The last interview was going to be with the founders of the company.