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Reply Interview Questions

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

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1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~70 min
2
Coding5 questions · ~50 min
Design an LRU CacheEasy
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Recently asked

Implement an LRU cache in O(1) average time using a hash table and doubly linked list.

Hash TablesQueueLinked ListsReply
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3
Pipelines5 questions · ~50 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityReply
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4
Machine Learning4 questions · ~40 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffReply
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5
Execution4 questions · ~40 min
Managing Critical Cross-Team DependencyMedium

Explain how you would manage a project at risk due to a slipping dependency owned by another team.

Risk AssessmentDependenciesScope ManagementReply
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6
Metrics4 questions · ~40 min
Diagnose a Metric Drop After LaunchMedium
Recently asked

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

Lagging IndicatorsLeading IndicatorsDiagnosisReply
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7
More topics23 questions · ~229 min
Prioritize Features for a New ProductMedium

A framework for deciding which features should ship first when building a new product.

Feature PrioritizationUser Needsproduct developmentReply
Pitfalls in Streaming Experiment AnalysisHard
Recently asked

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

Network InterferenceNovelty EffectSample Ratio MismatchReply
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