Very informal interview enivironment. I was interviewed by several members of the team I would be working with and had interesting conversations with all. Definitely be prepared with plenty of questions, as I am pretty confident I asked them more questions than they chose to ask me. Definitely don't be too concerned about this interview because the folks you will meet are very easy-going and aren't looking to stump you with an impossible question. The overall office environment is extremely friendly and I would highly recommend considering this company as a long term place to work.