The interview process started with a quick chat with one of their recruiters. We talked briefly about the position, my background, etc.

I then went through two hour-long phone-screen rounds using an online, collaborative code editor.

Afterwards, they flew me out to their Seattle office, where I went through 4 or 5 hour-long interviews. The interviews consisted of a fairly industry-standard mixture of algorithm and system design questions.

Overall, the process was efficient and enjoyable. Everyone I interacted with was very friendly and seemed to have a genuine enthusiasm for their work.

As mentioned above, they asked the kind of algorithm and design questions you would expect for a software engineer role. I'm not going to publicize the specific questions.