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Updated weekly · Last refresh Sep 24

MongoDB Data Analyst Interview Questions

The questions to prepare for a MongoDB Data Analyst interview. Questions from real interview reports rank first. Updated daily.

20questions
~3htotal time
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1
SQL & Data ManipulationStart here. 6 questions + 1 drill · ~65 min
Monthly Active User Growth by PlatformMedium
Practice
Recently asked

Use joins, CTEs, and monthly aggregation to compute Google Maps active users and month-over-month growth.

Window FunctionsDate FunctionsAggregationsMongoDB
Handling Nulls in Dashboard MetricsEasy
Recently asked

Explain how to handle NULLs in SQL-backed visualizations without misrepresenting counts, averages, or trends.

Data WranglingCase WhenAggregationsMongoDB
SQL Assessment Under Time PressureHard
Recently asked

Evaluates SQL problem-solving under time pressure and prioritization.

technical assessmentsqlMongoDB
Top Actions by CohortMedium
Practice
Recently asked

Rank the three most frequent non-null user actions within each cohort using aggregation and window functions.

Window FunctionsData ManipulationRankingMongoDB
Optimizing Slow QueriesHard
Recently asked

Tests your ability to diagnose and optimize large-scale query performance and data access patterns.

Performance Tuningindexesquery optimizationMongoDB
Join Choice and Analytical IntegrityMedium
Recently asked

Tests your understanding of join semantics and your ability to prevent analytical data corruption.

Joinsmany-to-onedata integrityMongoDB
SQL Plan Upgrade DetectionMedium
Practice
Practice drill

Identify customers with at least two plan upgrades in the same calendar month using PostgreSQL CTEs and aggregations.

Window FunctionsDate FunctionsJoinsMongoDBAmazon Services

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2
Behavioral & Leadership14 questions · ~129 min
Resolving Data Quality Under PressureMedium
Recently asked

Tests ownership of data quality issues, risk communication to leadership, and stakeholder management under business pressure.

Data QualityCommunicationLeadershipMongoDB
Correcting a Simple Analytical MistakeEasy
Recently asked

Tests ownership and communication when correcting an avoidable analytical error under time pressure.

mental mathtechnicalquantitative problem solvingMongoDB
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The finish line: interview-readyComplete all 20 questions plus 1 hands-on drill to finish this plan.