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Cintel Interview Questions

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

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1
A/B Testing & ExperimentationStart here. 3 questions · ~25 min
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchCCintel
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2
Pipelines6 questions · ~51 min
Optimize Multi-Terabyte ETL PipelineMedium

Explain how you improved a slow ETL pipeline on multi-terabyte data, including bottleneck analysis, tuning choices, and validation.

ETL optimizationdata processingperformanceCCintel
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3
Security & Infrastructure3 questions · ~25 min
Multi-Region HA and DRHard

Tests your expertise in resilience patterns, failover planning, and recovery testing for production workloads.

availabilityClouddisaster recoveryCCintel
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4
Execution3 questions · ~25 min
Monitoring and ObservabilityMedium

Assesses monitoring strategy and proactive health practices.

monitoringobservabilityCCintel
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5
Behavioral & Leadership9 questions · ~76 min
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6
More topics10 questions · ~85 min
Rolling Average with SQL Window FunctionsMedium
Practice

Use a PostgreSQL window function to calculate inclusive 30-day rolling sensor averages for active WSP monitoring assets.

Window FunctionssqlCCintel
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 TestingCCintel
Serverless vs Containers TradeoffsMedium

Assesses ability to choose appropriate compute models based on use cases.

Trade-offsContainersCCintel
Migrate Monolith to MicroservicesMedium

Tests ability to plan and execute migration from monolith to microservices in a cloud environment.

migrationcloud architecturemicroservicesCCintel
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
SQL Data Structure ReviewHard
Practice
Practice drill

Audit PostgreSQL metadata for missing or invalid keys and tables with inefficient sequential-scan patterns.

database optimizationindexesData StructuresMercury
The finish line: interview-readyComplete all 34 questions plus 2 hands-on drills to finish this plan.