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Updated weekly · Last refresh Aug 30
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Domain Group Data Scientist Interview Questions

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

31questions
~4htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~62 min
Rolling Average with Window FunctionsEasy
Practice

Calculate each Impact Recruitment Group consultant's three-day rolling average of completed placements.

Window FunctionssqlDDomain Group
Top Users by Recent Transaction VolumeMedium
Practice
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
Identify Funnel Bottlenecks in OnboardingHard
Practice
Practice drill

Use joins, CTEs, and aggregations to find the weakest step in an onboarding funnel and estimate lost conversions.

Funnel AnalysissqlDiagnosisAtlassianRevolut
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2
A/B Testing & Experimentation5 questions · ~42 min
Design Test for New FeatureMedium

Design an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.

experiment designfeature evaluationA/B TestingDDomain Group
Measure Interference in Customer Change TestHard

Design an experiment when treatment spills across customers and contaminates the control group.

Network InterferenceSwitchback TestsA/B TestingDDomain Group
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3
Product Sense4 questions · ~34 min
Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser valueDDomain Group
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4
Machine Learning5 questions · ~42 min
Machine Learning Experience YearsMedium

Assesses depth of hands-on experience with machine learning algorithms.

experienceMachine LearningDDomain Group
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5
Statistics & Probability3 questions · ~25 min
Probability and Hypothesis TestingMedium

Assesses statistical foundations and ability to apply hypothesis testing.

Hypothesis TestingprobabilityDDomain Group
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6
Behavioral & Leadership6 questions · ~50 min
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7
More topics3 questions · ~25 min
Diagnose a Performance DropHard

Investigate whether a performance decline is seasonal or a real product issue.

Leading IndicatorsDiagnosisTime SeriesDDomain Group
Text Mining and NLPMedium

Evaluates applied NLP skills and data handling in R/Python.

pythonDDomain Group
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The finish line: interview-readyComplete all 31 questions plus 2 hands-on drills to finish this plan.