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Factored Interview Questions

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

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1
SQL & Data ManipulationStart here. 4 questions · ~43 min
2
Coding5 questions · ~53 min
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonFactored
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3
System Design5 questions · ~53 min
Design Feature Drift Monitoring SystemHard

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingFactored
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4
Model Evaluation4 questions · ~43 min
Monitor Production Model PerformanceHard

Approach for monitoring a model in production and spotting drift, threshold issues, and calibration loss.

PrecisionAccuracyRecallFactored
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5
Pipelines5 questions · ~53 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityFactored
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6
Machine Learning5 questions · ~53 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 TradeoffFactored
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7
More topics22 questions · ~235 min
Investigate User Engagement DeclineMedium

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

RetentionDiagnosisEngagement MetricsFactored
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 MismatchFactored
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