It was an on campus interview with two individuals - a middle aged man and a rather young woman. They both asked a fair amount of questions. There was the typical explanation of background and experiences, then there were some thought-provoking and scientific questions. Overall, not a bad interview.

Applied online. Was contacted through email and invited to take a one-way automated interview (computer prompts questions and your responses are video recorded). Heard back about a month later (it was during holiday season) and invited to a phone interview. Questions were fairly simple; they asked about particular experiences on my resume, why I was interested in the company, and how I worked in a team. Was given an offer the next day. No in-person interview.