I wouldn't know the complete interview process as they never finished interviewing with me. I got a phone call from Michael Lochmondy and it was a simple phone screen. Afterwards he said that he would contact the Analytics team to have a group interview and see how I well I got along with them. I never got that phone call even after months of checking in with him.
I'm disappointed as Digitas was one of the companies I was really hoping to work for