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Updated weekly · Last refresh Aug 30

EPAM Systems Data Analyst Interview Questions

The questions to prepare for a EPAM Systems Data Analyst interview. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 11 questions · ~102 min
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice

Calculate the monthly spending trends for customers using window functions and joins.

EPAM Systems
Find Duplicate Rows in SQLEasy
Practice

Find duplicate client contact values using a CTE, join, GROUP BY, and HAVING.

Group ByHavingAggregationsEPAM Systems
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2
A/B Testing & Experimentation4 questions · ~37 min
Avoid Peeking in Feature TestMedium

Explain how to prevent premature A/B test decisions by pre-registering sample size, analysis timing, and guardrail-based ship rules.

PeekingExperimentationStatistical SignificanceEPAM Systems
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 TestingEPAM Systems
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3
Pipelines3 questions · ~28 min
Handling Missing Data in PipelinesMedium

Approach for handling missing data in an ML data pipeline, including validation, imputation, and safe downstream consumption.

InfrastructureETLBatch ProcessingEPAM Systems
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityEPAM Systems
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4
Metrics3 questions · ~28 min
Analyze New Feature EngagementMedium

Assess a new feature using adoption, activation, repeat usage, and retention metrics tied to user value.

Leading IndicatorsA/B TestingEngagement MetricsEPAM Systems
Diagnose a Metric Drop After LaunchMedium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosisEPAM Systems
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5
Behavioral & Leadership8 questions · ~74 min
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