I applied online. The process took 3 weeks. I interviewed at Citadel Securities in Nov 2020
Interview
Applied online, phone interview was
scheduled 2 weeks later for a technical screen.
HR was responsive, interviewer called on time and asked probability questions along with general market knowledge questions.
Interview questions [1]
Question 1
What market exchanges do you know ? Difference between Brent and WTI ?
Two brainteasers on conditional probability and optimal strategy for a dice-roll game.
I interviewed at Citadel Securities (New York, NY)
Interview
Online Assessment followed by 2 rounds of interviews with traders who ask you general probability questions / market making games. Then an onsite in the office which had a mix of a group game and 3 rounds of interviews; which had a mix of statistics and probability. Game was also similar in concepts. Very traditional quant process.
I applied online. The process took 4 weeks. I interviewed at Citadel Securities (Sydney) in Mar 2026
Interview
5 rounds - oa, 4 virtual interview rounds. oa consisted of probability, expected value and statistics questions. 1st round consisted of easy problems and market making. 2nd round had hard probability questions.
I interviewed at Citadel Securities (London, England)
Interview
Questions in earlier rounds were fairly easy. Final round was more difficult and open ended but overall quite interesting. One of the interviewers was very rude and kept going on his phone.
