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Moloco Interview Questions

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

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1
SQL & Data ManipulationStart here. 4 questions + 2 drills · ~56 min
2
Coding4 questions · ~36 min
Maximize Profit from Stock PricesEasy
Practice

Calculate the maximum profit from buying and selling stock once.

Moloco
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3
Pipelines5 questions · ~46 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityMoloco
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4
Execution4 questions · ~36 min
Managing a Failed Project PivotHard

Describe how you handled a project that failed or required a major pivot, including stakeholder alignment, trade-offs, and risk management.

Rollback PlanTrade-offsRisk AssessmentMoloco
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5
System Design4 questions · ~36 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 ServingMoloco
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6
Metrics4 questions · ~36 min
Diagnose Conversion Drop Post LaunchMedium

Diagnose why conversion fell from 4.8% to 3.1% after a launch by breaking the metric across funnel steps, cohorts, and segments.

Funnel AnalysisConversion RateDiagnosisMoloco
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7
More topics25 questions · ~228 min
Primary vs Guardrail MetricsEasy

Explain how a primary metric differs from a guardrail metric and how both are used in A/B test decisions.

ExperimentationGuardrail MetricsA/B TestingMoloco
L1 vs L2 RegularizationMedium

Explain how L1 and L2 regularization differ geometrically and probabilistically, grounded in a practical supervised learning example.

Feature EngineeringRegularizationSupervised LearningMoloco
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.