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Updated weekly · Last refresh Sep 20

Coupang Data Engineer Interview Questions

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

30questions
~4htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 1 drill · ~54 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
Practice

Query a comparison table to present the key structural and operational differences between SQL and NoSQL databases.

nosqlJoinsData WranglingCoupang
Debug Slow QueriesMedium

Tests skills in diagnosing query performance issues and applying targeted fixes.

Window FunctionsJoinsquery optimizationCoupang
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
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2
Pipelines10 questions · ~89 min
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
Data Warehousing in PipelinesEasy

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

InfrastructureETLData ModelingCoupang
Real-Time Dashboard Data PipelineMedium

Design a streaming pipeline that keeps dashboard data fresh and accurate for operational reporting.

InfrastructureStream ProcessingOrchestrationCoupang
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3
Coding3 questions · ~27 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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4
Behavioral & Leadership12 questions · ~106 min
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The finish line: interview-readyComplete all 30 questions plus 1 hands-on drill to finish this plan.