The whole interview process was excellent. I had an initial phone screen with HR. That turned into an offline code challenge. They gave me a week to work on it. It was pretty difficult, and took me a few hours. I passed, so they scheduled me for a final round of four on-site interviews (two technical interviews and two cultural).

Before I came on-site, they invited me to a candidate event at Brooklyn Boulders to meet some of the team and get a better sense of the culture. It was really fun, even though I don't like rock climbing. Everyone was very nice, and not intimidating at all.

On-sites are inherently stressful, especially with technical components involved, but as they go, this one wasn't bad. I had good conversations during the cultural fit interviews, and the technical ones were very collaborative. There was plenty of time to work through the problems, so I never felt rushed.

I would've happily worked at athenahealth if I hadn't gotten another offer from a smaller place.

One question involved repeatedly taking sums of submatrices within a parent matrix. There was an obvious caching optimization, and the question was straightforward. The interviewer was helpful and fun to work with.