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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 · ~36 min
7-Day Rolling Active UsersMedium
Practice
Recently asked

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

Window FunctionsDate FunctionsRunning TotalsWarner Bros. Discovery
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2
Machine Learning6 questions · ~54 min
Handling Imbalance in Churn ModelsMedium
Recently asked

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 & Experimentation4 questions · ~36 min
A/B Testing and Neural NetworksHard
Recently asked

Explain A/B testing and neural networks, including experiment design, metrics, power, randomization, and model training fundamentals.

Neural Networksexperiment designMDEWarner Bros. Discovery
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4
Behavioral & Leadership13 questions · ~118 min
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5
More topics11 questions · ~100 min
Compare Recommendation Models with Offline MetricsMedium
Recently asked

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

PrecisionAccuracyRecallWarner Bros. Discovery
Evaluating Observed Lift SignificanceMedium
Recently asked

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 PipelineHard
Recently asked

Explain an end-to-end pipeline from source ingestion through transformation, modeling, quality checks, orchestration, and reporting.

Data Qualitydata pipelineData ModelingWarner Bros. Discovery
End-to-End Streaming RecommenderHard
Recently asked

Design a cold-start recommendation system for Warner Bros. Discovery streaming users, from retrieval through ranking, serving, and evaluation.

ML RankingCold StartFeature StoreWarner Bros. Discovery
Diagnosing Metric DropsHard
Recently asked

Diagnose a sudden Warner Bros. Discovery engagement or retention decline by validating the metric and decomposing changes across users, platforms, and c...

RetentionKPIDiagnosisWarner Bros. Discovery
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