I was contacted by a recruiter and thought I'd give the interview a try since their product sounded interesting. I did a phone screening with one engineer, then did an onsite interview with about three engineering teams (one to two engineers from the teams) plus the CEO. Overall, I think it went well. They had a laptop to do coding technical questions on.

Given an array of numbers. In constant time, find if two numbers add up to another number in the array.