I applied through university. The process took 2 weeks. I interviewed at Groupon (Seattle, WA) in Dec 2014
Interview
I was interviewed by two persons. One is a senior UX designer and another is a design manager. Each for half hour. One hour in total.
They first asked me questions like what is your favorite design and why. And then I presented one project as I chose. I think the project is the most important part of this interview.