I applied online. The process took 2 weeks. I interviewed at Groupon
Interview
Gave an initial technical phone screen. Got past it and was invited onsite for some rounds of interviews. The interviewers were very friendly and helpful. Was asked about questions regarding some data structures and some system design.
Interview questions [1]
Question 1
Signed a NDA.
Was asked questions around the basic data structures and some questions related to system design