My first interview was over the phone. I was told about the company and the potion they were offering. During that phone call I was invited to the company's career day. There were several people there, for a variety of positions. After separating everyone based on the position they were applying for, different groups were formed. Within those groups we were interviewed by different people from the company. We rotated a few times to different groups to do more interviews. The process last a few hours, so I wold suggest clearing your day just to be safe. A day or two later I was contacted and offered a position.