I applied through an employee referral. The process took 2 weeks. I interviewed at Groupon (Seattle, WA) in Mar 2014
Interview
I got referral from it, and then jobvited to an phone interview. At first It's a US native interviewer but they delayed it again and again. At last they changed the interviewer into an Indian who can not speak clearly. And the phone interview only took 20 mins, for he didn't prepare it at all.