Analyst applicants have rated the interview process at Citi with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 70.3% positive. This is according to Glassdoor user ratings.
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The process took 2 weeks. I interviewed at Citi (New York, NY) in Oct 2008
Interview
Very behavioral-heavy. Interviewers are usually mean and will do "stress-tests" as well. Be prepared to show humility, your experiences working in teams, and why you are interested in a specific line of business. Citigroup hiring consists of an interview on campus (may be with one or two people), a superday that has tons of interviews. Be nice. Don't be mean.