The initial contact was done through an email, which was followed up by an initial phone interview/screen. They just wanted to check my credentials. They followed through with all of the former employees I had listed on my resume, so make sure they are all legitimate. The face-to-face interview took place about a month later. It was in a small room and I was interviewed by 3 employees including my soon to be boss, his boss, and an HR representative. It was fairly intimidating, but they were friendly about it. Dress up as much as possible.