Citadel Data Scientist Interview Experience — Five Rounds of Live Math and Python From Scratch

Citadel·Data Scientist·Oct 2025
Technical Screenmedium

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Published

Curated and edited by PracHub

Practice the questions from this interview

Compute P(third Ace | Ace in first two)
Implement max profit with K transactions (DP)
Derive lower bound for equicorrelation rho
Relate Y-on-X and X-on-Y coefficients
Implement left join on Python lists, no packages
Implement lazy unique-merge generator for sorted streams
Explain RF optimization and variable-importance pitfalls
Diagnose outliers and influence in linear regression
Design city home-price prediction system
Derive distribution of an inverse transform
Estimate OLS via streaming sufficient statistics
Discuss PhD coursework and research impact

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