I applied online. The process took 2 weeks. I interviewed at Citadel in Jan 2019
Interview
Applied online and received phone interview in two weeks, spent roughly 25min walking through CV and then asked data science problems and no brainteasers or coding problems. Really nice interviewer.
Interview questions [1]
Question 1
linear regression, regularization, feature selection
- Questions on Linear Algebra and Coding
- Discussion of a problem at the intersection of optimization and classical machine learning
- No behavioural questions or anything about my personality or work experience, the interview was purely technical
Interview questions [1]
Question 1
- Explain how to compute a product of two very large matrices in a computationally efficient way, using the structure of the problem and the matrices
Start with my own self-introduction and the interviewer's self-introduction first for five minutes, then a couple of technical questions for like thirty minutes, and in the end, questions for the interviewers about the company.
I received the interview a few weeks after applying online. During the interview i was asked by the interviewer about my past experience and also some other related technical questions.