4 people were interviewing for the same job on the same date. All of interviewees met in the main lobby with the hiring manager. We all ate lunch together and we had to give our presentation to each other at the end of the day. Luckily, we didn't interview each other. Strangest interview I have ever had in my life.

5-6 people would interview you one at a time. Each interviewer would target a different aspect of the key principles of the company. Some technical, some based on behavior and how you would fit in with the culture.