I applied through college or university. I interviewed at Proofpoint in Oct 2014
Interview
Submit resume at career fair, was asked to phone call with manager. Call was interesting, asked me why I used Chrome, what plugins I used, how browers worked, etc. Followed by an online coding problem and a 45 minute technical interview discussing your solution to the problem.
Interview questions [1]
Question 1
A phone number is easy to dial if you can dial on a standard phone layout without lifting your finger. Determine if a given number is easy to dial. Depending on how long it takes, there are additional parts like checking letters, error checking, adding adjacencies, etc.
Fairly quick response, within a month of my application I'd had my interview. Was pretty casual, lasted around 45 minutes. Was given a tour around the office afterwards. Received confirmation of offer within 2 weeks.
Interview questions [1]
Question 1
Asked to review a code fragment, point out rooms for improvement