I applied through university. The process took 2 weeks. I interviewed at Citadel (Beijing, Beijing) in Oct 2014
Interview
The interviewer was a recently graduated Ph.D and was really nice. We talked a few minutes on my resume and moved on to quantitative questions. He asked questions and let me do it with paper and pen. When I got a result, he told me whether I was correct or wrong. Anyway, the questions were difficult and I didn't pass
Interview questions [1]
Question 1
Suppose you have three random variables. The correlation between A and B is 0.6, the correlation between A and C is 0.8. What is the range of correlation between B and C?
I applied through university. The process took 2 weeks. I interviewed at Citadel in Sept 2022
Interview
two phone screens. some interviewers were nice and others were more strict, lots of interesting math and research discussed. got asked a flurry of technicals, ramping up in difficulty each time, and even some open ended questions where they explicitly said there is no interview-tractable solution and just wanted to hear my ideas for an approach
Interview questions [1]
Question 1
How do you generate a 1/4 probability using just coin flips? 1/3 probability? 1/pi probability?
I applied online. The process took 3 weeks. I interviewed at Citadel
Interview
HR phone call, tech phone call, then on site visit.
No food or breaks provided, pretty exhausting by the end when you meet with the manager who I would never speak highly about.
Interview questions [1]
Question 1
Algorithms, data structures and SQL on whiteboard
About 6 hours of 1:1 technical interviews with 5+ people in various domains (networking, database, programming, hardware).
A few phone interviews followed by technical chat with team member. Asked about past projects specifically, and followed by some questions that require a lot of working experiences to answer.
