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Updated weekly · Last refresh Aug 30

Drw Holdings Data Scientist Interview Questions

The questions to prepare for a Drw Holdings Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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1
Machine LearningStart here. 10 questions · ~80 min
Eigenvalues, Eigenvectors, and PCAMedium

Tests your conceptual understanding of linear algebra foundations behind PCA.

Drw Holdings
Bayesian View of Ridge and LassoHard

Tests your ability to connect Bayesian priors to regularization behavior in regression.

RegularizationDrw Holdings
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2
Statistics & Probability12 questions · ~96 min
Bayesian Probability with Continuous DistributionsHard

Tests your ability to apply Bayesian reasoning across discrete and continuous probability models.

Bayesian ReasoningConditional ProbabilityDrw Holdings
Constrained Covariance OptimizationHard

Tests your ability to formulate and solve constrained statistical optimization problems.

portfoliooptimizationDrw Holdings
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3
Behavioral & Leadership7 questions · ~56 min
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4
More topics5 questions · ~40 min
Primary vs Guardrail MetricsEasy

Explain how a primary metric differs from a guardrail metric and how both are used in A/B test decisions.

ExperimentationGuardrail MetricsA/B TestingDrw Holdings
Detecting Meaningful Metric DropsMedium

Tests your approach to defining metrics and building detection logic for performance regressions.

Leading IndicatorsDiagnosisDrw Holdings
Compare Rows to Previous in PartitionMedium

Tests your ability to use window functions for intra-partition comparisons.

Window FunctionsLag/LeadpartitioningDrw Holdings
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchDrw Holdings
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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 34 questions plus 3 hands-on drills to finish this plan.