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Updated weekly · Last refresh Aug 30

Darwill Data Scientist Interview Questions

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

27questions
~4htotal time
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1
Machine LearningStart here. 6 questions · ~49 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 TradeoffDarwill
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2
A/B Testing & Experimentation4 questions · ~33 min
Plan Sample Size for In-App ExperimentMedium

Estimate sample size and power for an experiment, define MDE and guardrails, and decide whether the test is worth running.

MDEPower AnalysisSample SizeDarwill
Design Experiment for Product ChangeHard

Design an end-to-end A/B test for a new product change, including metrics, MDE, power, randomization, and launch decision rules.

ExperimentationGuardrail MetricsA/B TestingDarwill
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3
Statistics & Probability3 questions · ~24 min
Testing a Conversion Rate DropMedium

Explain how to test whether an observed 5% conversion rate drop is statistically significant in an experiment or before-after comparison.

Hypothesis TestingData AnalysisStatistical SignificanceDarwill
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4
Behavioral & Leadership7 questions · ~57 min
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5
More topics7 questions · ~57 min
Diagnose KPI Drop After ReleaseMedium

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosisDarwill
Choosing Classification Evaluation MetricsEasy

Explain which classification metrics to use and how metric choice depends on the business objective and error tradeoffs.

PrecisionAccuracyRecallDarwill
Reducing Churn ApproachHard

Tests problem framing, modeling strategy, and impact measurement for retention.

User NeedsPain PointsProduct VisionDarwill
SQL Aggregations for ReportingEasy

Tests SQL proficiency for summarization and reporting-ready outputs.

Data WranglingGroup ByAggregationsDarwill
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Customers SQL QueryEasy
Practice
Practice drill

Aggregate customer sales volume and return Pyramid Consulting's top 10 customers in descending order.

RankingGroup ByAggregationsPyramid ConsultingBNYCambia Health Solutions
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
The finish line: interview-readyComplete all 27 questions plus 3 hands-on drills to finish this plan.