McDonald's Data Scientist Interview Questions

The questions to prepare for a McDonald's Data Scientist interview. Questions from real interview reports rank first. Updated daily.

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SQL & Data ManipulationStart here. 3 questions · ~29 min

Build Monthly Retention Cohort TableHard

Practice

Build a monthly customer retention cohort table using CTEs, date math, and conditional aggregation.

Window FunctionsDate FunctionsAggregations

McDonald's

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A/B Testing & Experimentation4 questions · ~39 min

Power Analysis for Survey ExperimentHard

Determine sample size and power for a customer survey or experiment, including MDE, guardrails, and a disciplined decision rule.

MDEPower AnalysisSample Size

McDonald's

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Product Sense3 questions · ~29 min

Approach to Open-Ended Business ProblemsMedium

Evaluates how you structure ambiguous problems and communicate trade-offs to business partners.

business problemstakeholder communication

McDonald's

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Behavioral & Leadership7 questions · ~67 min

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More topics10 questions · ~96 min

Evaluate Overfitting vs UnderfittingMedium

Explain how to tell whether a model is overfitting or underfitting using train versus validation performance and related checks.

Cross-ValidationBias-Variance TradeoffAccuracy

McDonald's

Evaluating Observed Lift SignificanceMedium

Explain how to test whether an observed experiment lift is real using hypothesis testing, p-values, and confidence intervals.

Confidence IntervalsStatistical SignificanceP-Values

McDonald's

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 IndicatorsDiagnosis

McDonald's

Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance Tradeoff

McDonald's

End-to-End ML ImplementationHard

Tests your end-to-end ML workflow, including data, training, evaluation, and deployment.

InfrastructureFeature StoreModel Serving

McDonald's

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