The process had several steps and it's documented fairly well in their blog posts so I won't go in detail, so just a summary. First step is the email screener with a couple of questions. Then there was a call with live coding session working on a flood fill algorithm. After that there's a call about culture contribution. Finally I got called for an on site series of tests, it's pretty much a whole day of tasks and talks with several people, so it's a pretty demanding experience.

Even though I was pretty satisfied with the process ( other than a few things I knew I could do better ) I did not get an offer. In the end I got the feeling that they have a 'checkbox template' of things a candidate has to posses with little regard on current situation, past experience and potential.

Flood fill algorithm, write something you're proud of, calculate distance between two points