Very thorough. There was a phone screen, a coding challenge, and then an extensive on-site interview that lasted the entire afternoon. It started with a review of your coding challenge, then some technical questions, then meeting the team, then a group code review, then a general discussion of your background with the team, then a challenge to develop a feature in their codebase in an hour while the team circulated watching over your shoulder while you worked. At the end of the day, it was made clear that I should expect an offer. Then I never heard back. They didn't even have the common decency to follow up to tell me that after committing to and acing their rigorous interview process, a referral of a current employee jumped ahead and took the position. I only found out this is what happened when I hounded the recruiter who connected me to the job opportunity in the first place. So bottom line is: the interview process is extensive but fair, however their communication practices are severely lacking, and there is a certain lack-of-ethical component that seems related as well.