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i2c Interview Questions

The questions to prepare for i2c interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 6 questions + 1 drill · ~68 min
2
Coding7 questions · ~68 min
Check String AnagramsEasy
Practice

Check whether two transaction names are anagrams after case folding and punctuation removal using character counts.

StringsAlgorithmsi2c
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3
Execution6 questions · ~58 min
Handle Scope Creep Mid-ProjectMedium

Explain how you would manage scope creep without damaging stakeholder trust or putting delivery at risk.

Trade-offsRisk AssessmentScope Managementi2c
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4
A/B Testing & Experimentation3 questions · ~29 min
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio Mismatchi2c
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5
Machine Learning6 questions · ~58 min
Handling Overfitting in Predictive ModelsMedium

Explain how to diagnose and reduce overfitting using regularization, validation strategy, and model complexity controls.

Cross-ValidationBias-Variance TradeoffRegularizationi2c
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6
Statistics & Probability6 questions · ~58 min
Statistical vs Practical SignificanceMedium

Explain why a statistically significant experiment result may still be too small to matter for product or business decisions.

Confidence IntervalsExperimentationHypothesis Testingi2c
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7
More topics16 questions · ~156 min
Diagnose a Metric Drop After LaunchMedium

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

Lagging IndicatorsLeading IndicatorsDiagnosisi2c
Database Indexes and PerformanceMedium

Tests knowledge of indexing tradeoffs and performance implications for transactional workloads.

performancedatabaseindexesi2c
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