I applied through an employee referral. I interviewed at Citadel Securities
Interview
Several phone screens with traders and then a superday. Traders ask lots of questions about markets and EV and probability--similar to any other firm. I personally thought the interviewers were quite nice, though this depends on team.
I applied online. The process took 2 weeks. I interviewed at Citadel Securities (Chicago, IL) in Nov 2025
Interview
Pretty interesting with a few brainteasers (dealing with unknown information and get a rough estimate about them ) and a probability question. Both are pretty easy but I messed them up.
I applied online. The process took 3 weeks. I interviewed at Citadel Securities in Sep 2025
Interview
Had a referral but had a ~30 min OA + 2 rounds of 45 min of mainly technical + in person super day (that I didn't reach). Was pretty standard for a quant trading interview. They were very responsive.
Interview questions [1]
Question 1
They asked a weird betting game with unknown balls in a bag and unknown draws.
Overall, they were responsive and happy to interview. My interviewer was really nice and the problems were fun to tackle. Although I was rejected it was a good experience overall.
Interview questions [1]
Question 1
Market making games and probability problems(expected value but twists on it)
Quant Trading Intern applicants have rated the interview process at Citadel Securities with 3.6 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 71% positive. To compare, the company-average is 53.8% positive. This is according to Glassdoor user ratings.
Candidates applying for Quant Trading Intern roles take an average of 20 days to get hired, when considering 7 user submitted interviews for this role. To compare, the hiring process at Citadel Securities overall takes an average of 25 days.
Common stages of the interview process at Citadel Securities as a Quant Trading Intern according to 7 Glassdoor interviews include:
Skills test: 36%
Phone interview: 29%
IQ intelligence test: 14%
One on one interview: 14%
Group panel interview: 7%
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