I applied online. The process took 2 days. I interviewed at Citi (New York, NY) in Apr 2018
Interview
first round is the phone interview, second is the onsite interview, for the onsite, there were three hrs interview, five managers, one by one, asking about things on your resume
I applied through an employee referral. The process took 5 days. I interviewed at Citi (Singapur) in Nov 2013
Interview
Only one round, but it took me about 1 hour because my employer was very satisfied with me and we had a very happy conversation. Basically it was comprised of many questions related to your resume. They emphasized both experience and ability although the work was mainly about dealing with Excel sheet. It was a good internship experience for starting career.
1 hour interview with a director. Some behavioral questions. Interest in the industry. Also asked about about Excel skills. Given some time to ask questions.