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Warner Bros. Discovery Data Scientist Interview Questions

The questions to prepare for a Warner Bros. Discovery Data Scientist interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 4 questions + 1 drill · ~45 min
7-Day Rolling Active UsersMedium
Practice

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsWarner Bros. Discovery
Top Genres by DemographicMedium
Practice
Practice drill

Use joins, aggregation, and row numbering to find the top three genres by viewing time for each user demographic.

JoinsData ManipulationRankingWarner Bros. Discovery
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2
Machine Learning6 questions · ~53 min
Handling Imbalance in Churn ModelsMedium

Explain how to train and evaluate a churn model when churn is rare and standard accuracy is misleading.

Bias-Variance TradeoffModel EvaluationSupervised LearningWarner Bros. Discovery
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3
A/B Testing & Experimentation3 questions · ~26 min
Homepage Carousel ImpactHard

Tests experimental design, causal reasoning, and guardrails for streaming recommendation changes.

experiment designGuardrail Metricsprimary metricsWarner Bros. Discovery
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4
Behavioral & Leadership13 questions · ~114 min
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5
More topics11 questions · ~96 min
Evaluate a Recommendation SystemMedium

Evaluate whether a recommendation system is improving engagement and ranking quality, not just offline metrics.

PrecisionAccuracyRecallWarner Bros. Discovery
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-ValuesWarner Bros. Discovery
Walk Through a Data PipelineMedium

Evaluates end-to-end thinking about data flow, quality, and handoffs to modeling.

data pipelineWarner Bros. Discovery
End-to-End Streaming RecommenderHard

Tests system design for cold-start recommendations, including data, modeling, and serving considerations.

Cold StartFeature StoreRecommendation SystemsWarner Bros. Discovery
Diagnosing Metric DropsMedium

Tests structured troubleshooting using metrics, segmentation, and hypothesis-driven analysis.

RetentionKPIDiagnosisWarner Bros. Discovery
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The finish line: interview-readyComplete all 37 questions plus 1 hands-on drill to finish this plan.