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DATAMAXIS Interview Questions

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

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1
CodingStart here. 8 questions · ~71 min
Reverse a String in PythonEasy
Practice

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

StringsfunctionspythonDATAMAXIS
Max Value in ArrayEasy
Practice

Scan an array once to return the maximum value, handling negatives and duplicates.

MathArraysSortingDATAMAXIS
Symmetric vs Asymmetric EncryptionEasy

Explain how symmetric and asymmetric encryption differ in key usage, performance, and common application patterns.

MathArraysDATAMAXIS
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2
Pipelines10 questions · ~88 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityDATAMAXIS
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityDATAMAXIS
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3
Execution6 questions · ~53 min
Test Strategy for New FeatureEasy

Explain how you would define, prioritize, and organize test cases for a new feature while aligning on risk and scope.

Risk AssessmentScope ManagementQualityDATAMAXIS
Decide What to AutomateEasy

Explain how you decide which tests to automate versus keep manual, balancing risk, cost, and long-term maintenance.

Trade-offsRisk AssessmentScope ManagementDATAMAXIS
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4
Behavioral & Leadership25 questions · ~221 min
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5
More topics1 question · ~9 min
Debugging SQL Performance BottlenecksHard

Tests your ability to diagnose and optimize complex SQL performance issues.

DebuggingsqlDATAMAXIS
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
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
Resolve Conflicting Customer AttributesMedium
Practice
Practice drill

Use joins, CTEs, and row ranking to resolve conflicting customer profile values across ACME House systems.

JoinsData WranglingQualityRamsey SolutionsACME House
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.