I applied online. I interviewed at Citadel (Paris)
Interview
Pretty simple questions about my CV and personal statement, followed by a math tes on statistics and probability and ended with a firendly discussion regarding my plans for the future in terms of career, life and general goals.
you don't know what division you will get into before you start the interview rounds. I was with fixed income and was asked very advanced questions about fixed income and central banking in the first round. Then in the second round was with 3 other traders individually, first math questions, second again FI quant questions and last one was very casual.
Interview questions [1]
Question 1
calculate the sharpe ratio of a 60/40 coin toss with +1$ / -1$ earning/loss respectively.
Coding round, Hacker rank questions. Definitely helps to prepare on Leetcode for a few days before the interview, do review all data structures and aim to write efficient code that's easy to read.