Contacted through LinkedIn about setting up a phone interview. I said I was interested but never was contacted until an engineer called me asking if I was ready to interview. I was not but winged it and did well. The engineer said I would be contacted about an in-person interview. About a week later, I received a call from a different engineer asking where I was. Apparently I was late for an on-site interview I was never contacted about. At this point, after two allegedly scheduled interviews I was unaware of, I requested to formally withdraw my application. Groupon really needs to work on their communication between engineering and HR.