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Gappify Interview Questions

The questions to prepare for Gappify interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
ExecutionStart here. 8 questions · ~68 min
2
Metrics6 questions · ~51 min
Investigate User Engagement DeclineMedium

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

RetentionDiagnosisEngagement MetricsGappify
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3
Strategy3 questions · ~25 min
Pivoting Strategy From Customer SignalsMedium

Describe how you used market or customer data to change course, and how you made the new strategy credible and measurable.

EstimationCompetitive AnalysisGrowth StrategyGappify
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4
A/B Testing & Experimentation3 questions · ~25 min
Handle Peeking in Customer ExperimentsHard

Decide how to analyze an experiment when results are checked repeatedly and multiple comparisons may inflate false positives.

PeekingExperimentationStatistical SignificanceGappify
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5
Statistics & Probability3 questions · ~25 min
Testing Engagement Change for NoiseMedium

Decide whether a change in user engagement is statistically real using hypothesis testing and confidence intervals.

Confidence IntervalsHypothesis TestingStatistical SignificanceGappify
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6
Coding3 questions · ~25 min
Optimizing Time ComplexityHard

Tests your algorithmic thinking and ability to improve performance by reducing time complexity.

time complexityoptimizationGappify
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7
More topics24 questions · ~203 min
Compare Signup Cohorts by RetentionHard
Practice

Use CTEs, joins, and date logic to compare 30-day activity rates across monthly signup cohorts.

Window FunctionsDate FunctionsCTEsGappify
Estimating Cars in a CityHard

Evaluates structured estimation, assumptions, and reasoning for ambiguous system design prompts.

EstimationGappify
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.