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Kumaran Systems Data Engineer Interview Questions

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

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1
SQL & Data ManipulationStart here. 7 questions + 2 drills · ~86 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsKumaran Systems
Customer Orders: LEFT vs INNER JOINEasy

Explain how INNER JOIN and LEFT JOIN differ, and when to use each for matched-only versus all-left-row analysis.

JoinsData WranglingGroup ByKumaran Systems
Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityKumaran Systems
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
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2
Pipelines4 questions · ~38 min
ETL vs ELT Trade-offsEasy

Compare ETL and ELT, and explain when ELT is the better pipeline pattern.

ETLELTData ModelingKumaran Systems
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityKumaran Systems
Data Quality and Schema EvolutionMedium

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

schema evolutionData ModelingQualityKumaran Systems
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3
Behavioral & Leadership8 questions · ~75 min
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4
More topics2 questions · ~19 min
Detect Cycle in Linked ListEasy
Practice

Use Floyd’s two-pointer algorithm to determine whether a singly linked list contains a cycle.

Hash TablesLinked ListsTwo PointersKumaran Systems
Python FundamentalsEasy

Assesses Python fundamentals relevant to implementing data engineering solutions.

fundamentalspythonKumaran Systems

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