The process started with a phone conversation with HR, and was followed up with a few phone conversation with people from the team, then meetings on the Seattle campus. Each step of the way, I met incredibly smart and kind people who were all very happy to talk with me about the position. While the interviews were not challenging the process was three months long and ended in a no. Considering the length and time it took to get to this no...that is what is challenging. My biggest piece of advice would be: don't put your eggs all in this basket, regardless of how many interviews you have or how nice the people are. Keep looking and applying other places.