I applied online. I interviewed at Prosek (New York, NY) in Jan 2017
Interview
Waited for a bit in reception, then had the interview in a small conference room with 2 employees. The interview lasted for a half hour and I was supposed to meet another employee and I guess they didn't want to bother with it on a Friday afternoon.
There were two sets of interviews with a writing test in between. Employees were extremely personable and helpful. Helped me gain insight into how the company culture was and how great the experience would be.