Applied through on-campus recruiting, followed with an onsite Superday. Interviewed with the leaders of all their product divisions and an employee from HR. Standard behavioral interview (Why mastercard, walk me through your resume, etc) -- since the interview is not terribly analytical or case based, make sure you know your answers thoroughly and have a compelling pitch for you're a good fit for the position. Research the products beforehand, come in with knowledge of the payments industry, possible competitors, and your own ideas. One brief case study for their prepaid division. Overall, very painless if you're well prepared and know what you're doing.