The interview process at Proofpoint was a combination of structured formality and casual interaction. The company is doing their best to structure the interview process to ensure a sense of professionalism, but in my case the schedule ran a bit long and the list of interviewers I spoke with was somewhat modified. That was fine with me since I planned for the unexpected, and I was able to meet with some very senior-level employees. I also believe the schedule ran long because they were very interested in meeting and getting to know me. So, it was well worth the time. The actual interviews and interaction were casual. I felt it gave both parties a chance to get to know one another. It was very interactive and I had an equal opportunity to ask questions of them to better understand their business and their requirements. It was easy to see during the interviews that the culture is serious in terms of getting their work done but the interaction between the interviewers was relaxed. I spoke with a total of eight people over the course of two days onsite. Some of the meetings were brief and others were longer but none were over 60 minutes.