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Updated weekly · Last refresh Sep 18

Bayer Data Scientist Interview Questions

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

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1
MetricsStart here. 4 questions · ~34 min
Diagnose Engagement DropHard

Identify the causes of a quarterly engagement decline through metric validation, decomposition, segmentation, and trend analysis.

MetricsDiagnosisuser engagementBayer
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2
Machine Learning6 questions · ~51 min
Decision Tree From ScratchHard

Implement a CART decision tree from scratch, including split selection, stopping rules, prediction, and evaluation.

Feature Engineeringmodel trainingSupervised LearningBayer
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3
Behavioral & Leadership23 questions · ~194 min
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4
More topics11 questions · ~93 min
Running Total With Window FunctionsEasy
Practice

Calculate each user's running order total over time using a window function.

Window FunctionsDate FunctionsRunning TotalsBayer
Statistical Project WalkthroughMedium

Walk through a past project using hypothesis testing and regression to turn data into a decision.

RegressionHypothesis TestingStatistical SignificanceBayer
Using Data to Influence DecisionsEasy

Share how you used data to shape a business decision, including the analysis, recommendation, and outcome.

User ResearchUser NeedsValue PropositionBayer
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchBayer
Machine Learning OverfittingMedium

Evaluates understanding of overfitting and practical mitigation strategies.

overfittingBayer
Approach Large DatasetsMedium

Assesses data pipeline and scalability thinking for large-scale analytics.

InfrastructureETLBatch ProcessingBayer
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Rolling 7-Day Average by RegionMedium
Practice
Practice drill

Calculate each product-region's rolling 7-day average sales using daily aggregation and calendar-aware windowing.

Window FunctionsDate FunctionsData ManipulationBayerCCoca-Cola Beverages SingaporeCCoupang USA
Rolling Transaction SQL and RankingHard
Practice
Practice drill

Calculate each user's 7-day rolling transaction average and daily spend rank using PostgreSQL window functions.

Window FunctionsDate FunctionsRankingGGreen ExchangeRakutenCCRED
The finish line: interview-readyComplete all 44 questions plus 2 hands-on drills to finish this plan.