I applied through an employee referral. The process took 3 days. I interviewed at MediaMath (Boston, MA) in Mar 2013
Interview
Interview process was very efficient. It did require 2 interviews, but that was because one of the managers was not available the first day. Interview lasted 3 hours and 2nd interview was scheduled for 2 days later. That one lasted 1 hour and I walked out with a verbal offer.