Grammarly Data Scientist Interview Questions

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

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Diagnose Sample Ratio MismatchHard

Investigate sample ratio mismatch and decide whether an experiment readout is trustworthy enough to ship.

Guardrail MetricsSample Ratio MismatchA/B Testing

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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 IndicatorsDiagnosis

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Diagnose a Metric Drop After Launch

Medium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosis

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Onboarding Flow Step Elimination

Medium

Tests product analytics skills for improving onboarding through data-driven step changes.

Feature Prioritizationonboarding

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Optimize Slow Join Queries

Medium

Tests query optimization strategies for large-scale Grammarly event data.

Joinsperformancequery optimization

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Statistical vs Practical Significance

Medium

Tests ability to distinguish statistical significance from effect size and business impact.

Hypothesis TestingStatistical Significance

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Python Class Hierarchy for Pipelines

Medium

Tests OOP design ability for building maintainable data and NLP pipelines.

InfrastructureAutomationData Modeling

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Python String Parsing for NLP

Medium

Tests practical Python skills for text parsing and feature extraction.

Data WranglingTokenization

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