Top 20
Prep plan
Updated weekly · Last refresh Sep 20
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Aily Data Scientist Interview Questions

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

20questions
~3htotal time
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1
A/B Testing & ExperimentationStart here. 5 questions · ~40 min
Marketing Campaign A/B Test DesignMedium

Design a marketing campaign experiment with a pre-registered metric plan, power calculation, and ship rule that respects guardrails.

ExperimentationHypothesis TestingA/B TestingAAily
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 TestingAAily
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2
Metrics3 questions · ~24 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 IndicatorsDiagnosisAAily
Investigate User Engagement DeclineMedium

Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.

RetentionDiagnosisEngagement MetricsAAily
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3
Product Sense3 questions · ~24 min
Go-to-Market StrategyMedium

Assesses your ability to reason about positioning, channels, and target customers.

business strategyproduct developmentAAily
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4
Machine Learning4 questions · ~32 min
Explain RAGMedium

Evaluates understanding of retrieval, grounding, and end-to-end RAG pipelines.

model architectureMachine LearningRAGAAily
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5
Behavioral & Leadership3 questions · ~24 min
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6
More topics2 questions · ~16 min
Handling Missing and Dirty SQL DataMedium

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQualityAAily
Analyze Feature Impact with StatsMedium

Evaluates appropriate statistical techniques for causal inference and measurement.

AAily
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 20 questions plus 3 hands-on drills to finish this plan.