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Updated weekly · Last refresh Sep 24

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.

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1
CodingStart here. 4 questions · ~42 min
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersWalmart Labs
Optimize Search for Distributed DataHard

Tests your ability to design scalable search strategies for large distributed data.

distributed systemsoptimizationWalmart Labs
Top K Elements in StreamHard

Tests your approach to streaming data structures and complexity tradeoffs.

Stream ProcessingData StructuresAlgorithmsWalmart Labs
Merge Two Sorted Arrays ComplexityMedium

Tests your understanding of algorithmic complexity for core data operations.

ArraysAlgorithmsWalmart Labs
2
More topics3 questions · ~31 min
Data Consistency and Fault ToleranceHard

Tests your understanding of reliability, consistency, and failure handling in data pipelines.

fault tolerancedata consistencyWalmart Labs
ETL Pipeline on GCPHard

Tests your ability to build production-grade ETL on GCP for Walmart Labs scale.

data pipelineETLWalmart Labs
Measuring Store Feature ImpactMedium

Assesses how you design measurement and analytics to evaluate product impact at Walmart Labs scale.

Data AnalysisWalmart Labs

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