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Updated weekly · Last refresh Nov 11

Walmart Labs Data Engineer Interview Questions

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

46questions
~13htotal time
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1
SQL & Data ManipulationStart here. 5 questions · ~82 min
Sales by Day WindowMedium
Practice

Compute a chronological rolling mean for each product using a PostgreSQL window function.

Data ManipulationAggregationsnull valuesWalmart Labs
Delete Duplicates in SQLEasy
Practice

Remove duplicate sales records while preserving the row with the smallest identifier.

data cleaningData Manipulationdata integrityWalmart Labs
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2
Coding19 questions · ~310 min
Salaries Above AverageMedium
Practice

Group employee salaries by department, compute each department average, and return employees whose salary is above it.

aggregationArraysAlgorithmsWalmart Labs
Group AnagramsMedium
Practice

Group words that share the same character-frequency signature using a hash map.

ArraysData StructuresAlgorithmsWalmart Labs
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3
System Design14 questions · ~229 min
Filtered Requests Data StructureHard

Design an indexed data structure for filtering request records by user, endpoint, response code, and timestamp.

database accessdata ingestiondesignWalmart Labs
Spark Job Failure TroubleshootingHard

Diagnose a Spark job failing at 40%, propose fixes, and increase memory without changing executor count.

distributed systemscomputational costfailure modesWalmart Labs
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4
Behavioral & Leadership6 questions · ~98 min
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5
More topics2 questions · ~33 min
Designing Consistent Fault-Tolerant GCP PipelinesHard
Recently asked

Explain how to build consistent, fault-tolerant batch and streaming pipelines on GCP for Walmart Labs.

Data Qualitydata pipelinefault toleranceWalmart Labs
ETL Pipeline on GCPHard
Recently asked

Design a reliable end-to-end ETL pipeline using GCP Dataflow and BigQuery for Walmart Labs data.

data pipelineETLdata warehouseWalmart Labs
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