J'ai passé un entretien chez Citadel Securities (Chicago, IL)
Entretien
3 rounds phone interview (couple weeks apart) then final on site in Chicago. Phone interview had each 2-3 questions lasted 30-45 min. On site was a whole day process .
Questions d'entretien [1]
Question 1
Regress X1 against Y get R2 of 0.1 then regress X2 against Y get R2 of 0.2. What is max R2 of regressing X1 and X2 against Y.
J'ai passé un entretien chez Citadel Securities (Singapour)
Entretien
Long telephonic and video interview. Maths, probability questions and a small programming assignment. Moderate difficult interview level. Motivation/ interest to join cit sec. Started
on time and very efficient use of time
It was mostly about coding. I was first being asked to share my research experience followed by a Q&A, and then we moved on to a DP problem. Since we discussed my research for ~ 40 min, I didn't have time to finish testing my code.
J'ai passé un entretien chez Citadel Securities (New York, NY)
Entretien
Internal matching process, then straight to a technical round. Technical Interview, some probability (brainteaser style, refresh conditional probability and Markov Chain) and linear regression, plus some coding puzzle (leetcode style medium)
Questions d'entretien [1]
Question 1
Anything you know about linear regression and related follow ups