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JOHN LEONARD Analytics Engineer Interview Questions

The questions to prepare for a JOHN LEONARD Analytics Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 6 questions + 3 drills · ~78 min
Handling Missing Values in ProductionMedium

Explain how to detect, classify, and safely handle missing values in PostgreSQL production datasets.

missing valuesdata cleaningproduction environmentJOHN LEONARD
Explain SQL Join TypesEasy

Explain INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with examples and when to use each.

JoinsData WranglingGroup ByJOHN LEONARD
Designing User Retention TablesHard

Tests your data modeling skills for cohort-based retention analysis and queryability.

schema designuser retentionData ModelingJOHN LEONARD
Optimizing Slow SQL or PySparkHard

Evaluates your performance troubleshooting skills across SQL and distributed processing.

pysparkPerformance TuningJOHN LEONARD
Handling Missing DataMedium

Assesses your approach to diagnosing, treating, and validating missing data in analytics pipelines.

Data QualityJOHN LEONARD
Refactoring Nested QueriesHard

Assesses your ability to improve maintainability and efficiency through query refactoring.

performanceJOHN LEONARD
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
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
Find Spending Variance Drivers by DepartmentHard
Practice
Practice drill

Use joins and LAG to isolate departments driving a large month-over-month spending variance.

JoinsData WranglingGroup ByState of CaliforniaUniversity of ChicagoThe Church of Jesus Christ of Latter-day Saints
2
Behavioral & Leadership8 questions · ~64 min
Resolving Conflict With a ColleagueEasy

Tests conflict resolution in a sales context, including communication, influence, and preserving internal alignment around an account.

Conflict ResolutionCommunicationDealing With AmbiguityJOHN LEONARD
More Behavioral & Leadership questions with a free account
3
More topics1 question · ~8 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityJOHN LEONARD

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The finish line: interview-readyComplete all 15 questions plus 3 hands-on drills to finish this plan.