Talking to many leads/supervisors very quickly and superficially in a room with others doing the same---a very loud and distracting atmosphere. It was not normal or professional. The HR person was the rudest and most unpleasant encounter I've ever had applying to jobs.

The interview consisted of an introductory section, a tour, and interviews with 3 different people. It lasted about 4 hours. The interviewers were nice enough and really tried to extract information about you rather than test you based on your interviewing abilities, how most interviews would do. This demonstrated their care for hiring the right candidate. Focus on the cultural aspects of the company and you will likely succeed.