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Updated weekly · Last refresh Aug 30

CVS Health Data Scientist Interview Questions

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

47questions
~6htotal time
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1
Machine LearningStart here. 7 questions · ~57 min
Supervised vs Unsupervised LearningEasy

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

Unsupervised LearningFeature EngineeringBias-Variance TradeoffCVS Health
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2
A/B Testing & Experimentation6 questions · ~49 min
Avoid Pitfalls in Online ExperimentsHard

Explain common online experimentation pitfalls and how to design, analyze, and decide in ways that avoid false wins.

Network InterferenceNovelty EffectSample Ratio MismatchCVS Health
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3
System Design4 questions · ~33 min
Design Feature Drift Monitoring SystemHard

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingCVS Health
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4
Statistics & Probability4 questions · ~33 min
Explaining Confidence IntervalsEasy

Explain what a confidence interval means and how to communicate it to a non-technical stakeholder.

Confidence IntervalsHypothesis TestingCommunicationCVS Health
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5
SQL & Data Manipulation8 questions + 3 drills · ~95 min
Use Pandas to Clean Missing ValuesEasy

Tests data cleaning techniques in Pandas and awareness of downstream effects.

Data WranglingAggregationsQualityCVS Health
SQL: Store Performance and MarginHard
Practice
Practice drill

Join CVS store, sales, and inventory data to calculate margin, rank stores, and flag underperforming locations.

JoinsGroup ByAggregationsCVS Health
SQL: 7-Day Rolling AverageMedium
Practice
Practice drill

Calculate each CVS store's 7-day rolling sales average using a CTE, aggregation, join, and window function.

Window FunctionsDate FunctionsRunning TotalsCVS Health
Top Paid Per DepartmentEasy
Practice
Practice drill

Find the top 3 highest-paid employees in each department using window functions.

Window FunctionsRankingBrillioAubay SpainSabre Systems
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6
Behavioral & Leadership10 questions · ~82 min
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7
More topics8 questions · ~65 min
Diagnose Conversion Drop Post LaunchMedium

Diagnose why conversion fell from 4.8% to 3.1% after a launch by breaking the metric across funnel steps, cohorts, and segments.

Funnel AnalysisConversion RateDiagnosisCVS Health
Batch Pipeline for Patient DataHard

Tests data engineering skills for ingestion, validation, and backfill in healthcare pipelines.

ETLBatch ProcessingBackfillingCVS Health
Compute F1 Score From Confusion MatrixMedium

Tests ability to implement core classification metrics correctly in Python.

Confusion MatrixF1 ScorePrecisionCVS Health
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The finish line: interview-readyComplete all 47 questions plus 3 hands-on drills to finish this plan.