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Citadel Securities Quantitative Analyst Interview Questions

The questions to prepare for a Citadel Securities Quantitative Analyst interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
CodingStart here. 11 questions · ~93 min
Median of Two Sorted ArraysHard
Practice

Find the median of two sorted arrays using binary search in O(log(min(m, n))) time.

binary searchMathArraysCitadel Securities
Dynamic Programming or HeapsHard

Tests your problem-solving and coding skills for algorithmic challenges using DP or heap-based methods.

coding challengeDynamic ProgrammingCitadel Securities
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2
Statistics & Probability11 questions · ~93 min
Handling Correlated Data AssumptionsMedium

Assesses your understanding of how correlation affects statistical modeling assumptions and conclusions.

CorrelationData AnalysisCitadel Securities
Distributions for Market DataMedium

Assesses whether you can connect probability distributions to modeling and inference on market data.

statisticsCitadel Securities
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3
Machine Learning11 questions · ~93 min
Machine Learning Model ImplementationMedium

Assesses your ability to implement and reason about ML models or optimization methods for quantitative tasks.

Machine LearningoptimizationCitadel Securities
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4
Finance & Accounting11 questions · ~93 min
How to Tell Which Risk Model Is BetterHard

Evaluates model comparison skills and risk-model validation judgment.

Financial AnalysisCitadel Securities
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5
Behavioral & Leadership3 questions · ~25 min
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6
More topics3 questions · ~25 min
Correlation Matrix and CSV/Parquet LoadingMedium

Evaluates statistical reasoning and practical data engineering considerations.

data handlingCitadel Securities
Estimate a Country PopulationMedium

Assesses quantitative estimation skills and assumptions in real-world sizing problems.

EstimationCitadel Securities
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.