The process took 2 weeks. I interviewed at Citadel (New York, NY) in June 2018
Interview
There only two rounds in total. One phone conversation with the direct hiring manager followed by an all day in person interview. They have a perk of free food and gave me a good lunch break.
There were 3 interviews in the morning followed by 3 interviews after lunch.
Interview questions [2]
Question 1
Questions around understanding financial markets and financial instruments. For example questions around how corporate action tenders are processed