I interviewed at the headquarters in Rosemont, IL. The interview process took around 4-5 weeks. The process included a series of emails telling me that the team had selected my resume to move on. I was invited to interview at the headquarters in Rosemont. The interview consisted of a presentation, then two 45-minute interviews with different panels of four interviewers. Everyone was really nice and made me feel very welcomed. The process was very professional, I was impressed.