I applied online. I interviewed at Citadel Securities (London, England) in Nov 2025
Interview
Initial screening followed by a technical round. The technical interview mainly focused on problem-solving ability. Two Data Structures and Algorithms (DSA) questions were asked to evaluate coding logic and analytical thinking.
Interview questions [1]
Question 1
They asked me two DSA problems focused on arrays and problem-solving logic.
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.
Very basic oop questions with a lot of emphasis on python syntax, should be fine if candidate prepared a b c d e f g h i j k l m n o p q r s t u v w y x y z
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