I applied online. The process took 1 day. I interviewed at Citadel (New York, NY) in Nov 2017
Interview
When I submit my application, the email sent me immediately. You need to complete it in 48 hours. Online Assessment, total 15 questions. You need to complete in 1 hours. No programming questions.
Interview questions [1]
Question 1
Many statistic problems and machine learning problems.