It was pretty straightforward, in my case. An online assessment that involved critical reading, math as well as logic problems (plain standardized testing), a coding portion that was pretty straightforward, and then I got the opportunity to fly up to Seattle. At the on-site interview, we had 4 straight rounds, each about 45 minutes long, of one-on-one interviewing. They covered what I thought were standard topics, such as Big O, sorting, data structures, etc. There were design as well as code-oriented problems, all of them definitely study-able. Then a few weeks later, they emailed me with the offer.