The interview process included a fairly standard algorithms phone screen, followed by an all-day onsite interview.

One question involved designing and building a merchant dashboard from scratch within an hour and a half.

Another focused on storing Foursquare-style location check-ins and determining a user's location at a given time.

A third question required debugging a project on GitHub. This debugging question proved quite annoying, as the interviewer and I spent about a third of the allotted time trying to set up a really old version of Ruby, which was necessary for the problem.

Design and build a merchant dashboard from scratch.