There are 4 or five members on each interview. They ask a variety of questions to gauge how thinking and experience line up with the job. They are looking for you personality as well. If a question catches you off guard avoid saying I don't know. Just think about the question and breathe.

Contacted by a recruiter, she was very confused or new, then talked to HR, then set up the interview. Two different interviews, but overall good experience interviewing. Overall great company