I was referred to them by a recruiter and was called in for an in-person interview. I had to sign-in, and could tell there were a few other people interviewing that week. I had a round of about 5 interviews that lasted most of the day until about 4:00pm. They said the reason I didn't get the job was my pair programming session. That surprised me a bit, because I thought I did really well at that. I think the real reason I didn't get the job was because I had a clumsy answer to one of their people-skill / culture-fit questions. Most of the employees seemed happy, and a few made some jokes that had me laughing pretty hard. They value pair programming a lot. Maybe a bit too much. I like to pair program occasionally, but I'm most efficient when I'm able to deep-dive into a project and go into the zone with my headphones on. I can do both, but I lean towards headphones-style development for 80% of my time, which is why I think I wasn't the best culture fit for them.