There are two rounds. First is one on one interview about your past experience and some math/statistics questions. Final round is 3 x one on one interviews, each of them is math/coding/behavior. The overall experience is pretty nice.
I applied through an employee referral. The process took 2 days. I interviewed at Citi (New York, NY) in Apr 2015
Interview
Phone interview followed by two days of interviews in the office. The phone interview was mostly behavioral where he asked me about my resume. The interviews in the office consisted of 7 interviews with managers in the risk department. Each manager asked me different questions but mostly about what interested me and why I wanted the internship. Pretty basic stuff.
Interview questions [1]
Question 1
Mostly behavioral questions, few little technical questions. Have questions prepared
I applied through university. The process took 2 weeks. I interviewed at Citi
Interview
One interview in school, it was behavioral based.
3 interview in NY headquarters, focused on technical skills, soft skills, and stress-handling abilities.
Interview questions [1]
Question 1
Why do you want to work at Citi given the economic uncertainty