I applied online. I interviewed at Citadel Securities in Aug 2020
Interview
Initial Hackerrank Assessment with two questions. Both challenges were of average difficulty and involved matrix manipulation and dictionary based problems. One hour for two problems was given. I applied through a recruiting service.
Interview questions [1]
Question 1
Matrix rotation to go from an input to a target matrix.
I applied through a recruiter. I interviewed at Citadel Securities (New York, NY)
Interview
The process was quite standard, but there was a big time gap between the OA and the interview. All rounds had both a background discussion and technicals. Technical rounds were with actual SWEs. They were pretty friendly, and more concerned with problem-solving than trivia or language depth.
Interview questions [1]
Question 1
OA was quite easy, 2 questions: first was lc medium, second was lc easy. First round was standard DSA question for an order book string problem. Second round was heavy C++ debugging.
I was reached by a recruiter, and I was later called for a personal interview which happened on zoom. This was for HK location. There was no online assessment test.
Interview questions [1]
Question 1
Implement queue using vector, no constraints were given. I did it but took some time - verdict - reject.
Also asked in depth about a project I've worked on and I am proud of. I spoke of the last project I had worked on, he seemed satisfied didn't ask a lot of cross questions.
Standard frontend exercise. Know your javascript and react. Be prepared to explain how you would optimize for performance.
Explain in depth how react renders and rerenders.
Handle real time data display.