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Updated weekly · Last refresh Nov 6

Coupang Data Engineer Interview Questions

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

36questions
~5htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~62 min
SQL Top 10 Products by SalesEasy
Practice

Aggregate completed SMX product sales and return the top 10 products by units sold.

RankingGroup ByAggregationsCoupang
SQL vs NoSQL DifferencesEasy

Explain how SQL and NoSQL databases differ in data model, schema, consistency, and scaling, and when to choose each.

nosqlJoinsData WranglingCoupang
Handling Missing DataMedium
Practice
Practice drill

Standardize missing observation fields with fallback values, missingness flags, and ordered output.

Window Functionsmissing valuesdata cleaningEversource EnergyCincinnati Children's HospitalAdtalem Global Education
Top Products by Sales RevenueEasy
Practice
Practice drill

Find the top 10 products by total sales revenue using joins, aggregation, and a CTE.

RankingGroup ByAggregationsRTXiSmile TechnologiesCatalina
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2
Pipelines11 questions · ~92 min
Data Warehousing in PipelinesEasy

Explain what a data warehouse is and why it matters in analytics pipelines.

InfrastructureETLData ModelingCoupang
Capacity Planning for Data PipelinesMedium

How to think about capacity planning for a pipeline, including throughput, storage growth, latency, and operational headroom.

system designhardware architecturecapacity planningCoupang
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3
System Design4 questions · ~34 min
Exactly-Once Processing SemanticsHard

Tests understanding of exactly-once guarantees in streaming systems.

data processingCoupang
Fault-Tolerant Multi-Region MonitoringHard

Assess design of resilient monitoring and alerting in multi-region deployments.

monitoringalertingfault toleranceCoupang
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4
Coding3 questions · ~25 min
Efficient Sorting for Large DatasetsMedium

Tests ability to choose and explain efficient algorithms for large-scale data processing.

MathArraysSortingCoupang
Optimize Slow AlgorithmsHard

Tests ability to analyze performance bottlenecks and improve algorithmic efficiency.

Dynamic ProgrammingSearchingGreedyCoupang
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5
Behavioral & Leadership13 questions · ~109 min
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The finish line: interview-readyComplete all 36 questions plus 2 hands-on drills to finish this plan.