4 stages and very interactive. The process took about two weeks. Met senior leadership and current team members. Received an offer approximately 3 weeks after initial interview. I enjoyed the process and the people I met with.
I applied online. The process took 1 day. I interviewed at Groupon (Chicago, IL) in Feb 2012
Interview
Was on a Saturday. Over 20 people were brought in. Met with 2 managers, was a very relaxed conversation. Talking about previous job experiences and college background. Toured the office, met with the recruiter. Interview took around an hour and half.