HR - trader phone call interview - 2 virtual onsite with traders PMs, final round chat with senior PM for fit. Often you will not be told who is interviewing you.
Initial interview was a group interview assessment where everyone takes a mathematical exam synchronously as HR is watching, usually involving probability and statistics mostly, and was quite advanced. Second round was with people from the desk.
Interview questions [1]
Question 1
Can't recall specifics, but brush up on probability, especially distributions pdfs/cdfs etc.
CV - live math test - phone screen - 2x onsite - final round with pm. focus on math, prob, ml and markets. hr take a few days after interview to come back
i skipped to superday due to previous internship, online superday in early september, 4 rounds, various kinds of questions with differnet people, heard back within the day and got rejected
Interview questions [1]
Question 1
bayesian math: if 0.1% of people have a disease, you have a test that is correct 99% of the time, how likely is someone with a positive test to ahve the disease?
Trading Intern applicants have rated the interview process at Citadel with 3.3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 50% positive. To compare, the company-average is 46.3% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -