Xtage Data Scientist Interview Questions

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

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Behavioral & LeadershipStart here. 3 questions · ~31 min

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SQL Window Functions for RetentionMedium

Practice

Calculate monthly cohort retention using date-based cohorts, aggregation, and window functions.

Window FunctionsLag/LeadDate Functions

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Diagnose a KPI DropMedium

Build a structured process to identify why a KPI declined, validate root causes, and recommend corrective actions.

KPIDiagnosisactionable insights

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Define Metrics for New FeaturesMedium

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

MetricsFeature Prioritizationuser value

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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 Mismatch

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Chicago Car Ownership EstimationMedium

Assesses estimation skills and the ability to structure assumptions for a real-world quantity.

Estimation

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Linear Regression FoundationsHard

Evaluates core machine learning concepts and practical feature selection and diagnostics for regression models.

linear regressionModel Evaluation

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SQL Window Functions for TrendsMedium

Practice

Calculate three-day rolling user activity averages and classify behavior trends with SQL window functions.

null handlingData ManipulationAggregations

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Diagnosing a 10% Metric DropHard

Build a systematic process to validate, decompose, and explain a sudden 10% drop in core engagement.

root cause analysisDiagnosisdiagnostic process

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Hands-on SQL practiceWrite and run real queries in the editor. 1 drill · ~10 min

SQL Rolling Average ConversionsMedium

Practice

Practice drill

Calculate daily conversions and a seven-day rolling average using PostgreSQL aggregation and window functions.

Window FunctionsDate Functionsnull handlingGGetYourGuide

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