I applied through a recruiter. The process took 2 weeks. I interviewed at Citadel Securities (London, England) in Jul 2019
Interview
First Stage live coding test, second stage was a phone screening before a final on-site interview. The on-site interview lasted 4 hours with 5 different interviewers. Programming questions and lots of brain teasers
Interview questions [1]
Question 1
You have a scale and 18 balls. One of the balls is slightly heavier than the rest. The rest are identical. What is the minimum number of times you need to use the scale to determine which ball is the heavy ball?
I applied online. I interviewed at Citadel Securities (New York, NY) in May 2021
Interview
Submit the resume, and then get the coder pad invitation link, and zoom link. similar to a phone interview + coding test.
firstly describe myself, and then start python coding on coder pad. When writing code, need to talk about the intuition.
I applied through a staffing agency. The process took 2 weeks. I interviewed at Citadel Securities (London, England) in Sept 2019
Interview
Phone interview described as CoderPad but in practice was a series of trick questions about particular edge cases of C, C++ programming language and the underlying implementation details of STL. It seemed to be to allow the interviewer to use his knowledge of minute details of the C/C++ language to catch candidates out rather than to identify the strengths of candidates that would make them great hires,.
