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Arrowstreet Capital Data Scientist Interview Questions

The questions to prepare for a Arrowstreet Capital Data Scientist interview. Questions from real interview reports rank first. Updated daily.

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1
Statistics & ProbabilityStart here. 8 questions · ~67 min
Guaranteed Matching Pair in SocksEasy

Use worst-case reasoning to find the minimum number of sock draws needed to guarantee a matching pair.

combinatoricsExpected ValueConditional ProbabilityArrowstreet Capital
Probability of Sum NineEasy

Compute the probability that two fair six-sided dice add up to 9 by counting favorable outcomes over total outcomes.

DistributionsExpected ValueConditional ProbabilityArrowstreet Capital
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2
Machine Learning3 questions · ~25 min
Ridge and Lasso for Noisy DataMedium

Tests tradeoffs between bias-variance, regularization, and interpretability for noisy signals.

Bias-Variance TradeoffRegularizationRegressionArrowstreet Capital
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3
Behavioral & Leadership7 questions · ~58 min
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4
More topics7 questions · ~58 min
Define Feature Success MetricsMedium

Framework for choosing a feature's primary success metric and guardrails before launch.

MetricsFeature PrioritizationProduct VisionArrowstreet Capital
Diagnose a Metric Drop After LaunchMedium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosisArrowstreet Capital
SQL Rank Top 3 Per RegionMedium

Tests window function mastery and correct ranking logic for region-level performance reporting.

Window FunctionsRankingAggregationsArrowstreet Capital
Pitfalls in Financial A/B TestsHard

Tests awareness of bias, leakage, and statistical pitfalls specific to trading and portfolio decisions.

Network InterferenceNovelty EffectSample Ratio MismatchArrowstreet Capital
Vectorize Slow Python Matrix CodeMedium

Tests performance engineering and ability to rewrite computations efficiently for large datasets.

technical experiencepythonoptimizationArrowstreet Capital
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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 25 questions plus 3 hands-on drills to finish this plan.