I applied through an employee referral. The process took 3 weeks. I interviewed at Citadel Securities (New York, NY) in Oct 2021
Interview
Starts with online application ,then 2 phone rounds, and lastly a superday with four back to back interviews. (no online assessment or coding test in my interview process) HR follow up really fast, within one week or sometimes a couple of days after each round.
Interview questions [1]
Question 1
Standard probability questions, market making questions, some behaviorals
Mix of behavioural and technical questions, with a focus on market making games.
For example make a market on the sum of two dice rolls. Also some questions involving options theory.
I applied online. I interviewed at Citadel Securities (New York, NY) in Oct 2025
Interview
Consisted of an OA with 10 probability questions. pretty straightforward dice and coin flip problems for the most part. I think you get like 25 minutes or something to do it. Next was first round interview which was the same kind of probability questions but this time with a specific focus on casino games. Second round was market making questions, I would practice these as they as you a lot about logic, risk parameters, and how continuous versus stationary distributions change how you should bet.
I interviewed at Citadel Securities (New York, NY)
Interview
Phone screen with probability and math questions conducted by traders. Pretty standard stuff but interviewer gave no hints so be prepared to explain and be firm in your reasoning. Green book and quant guide probably helps.
