I applied through an employee referral. The process took 4 weeks. I interviewed at Groupon (Chicago, IL)
Interview
The interview process is pretty long, about 4 hours. You sit in with 3 people on the team you apply for, and 1 outsider. You would sit with each one for about an hour and it would be a decent process of interacting with them. Although it was long, it wasn't painful.
Interview questions [1]
Question 1
Just some general questions about what you've done and how you'd approach things.