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Updated weekly · Last refresh Oct 17

Walmart Global Tech Data Engineer Interview Questions

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

50questions
~11htotal time
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1
SQL & Data ManipulationStart here. 11 questions · ~151 min
SQL Window Functions and Spark EquivalenceHard
Practice

Rank associates by store sales and compare each completed sale with the previous and next sale.

Lag/LeadJoinscomplex queriesWalmart Global Tech
SQL Split into RowsMedium
Practice

Split each non-empty input string into ordered character rows using PostgreSQL string functions.

null handlingData Manipulationdata extractionWalmart Global Tech
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2
Coding12 questions · ~165 min
Diameter of Binary TreeMedium
Practice

Find the longest path between two nodes in a binary tree using postorder depth-first search.

dfsData StructuresAlgorithmsWalmart Global Tech
Design Data Structure for Filtered RequestsMedium
Practice

Build indexes to return valid 2xx requests efficiently under user, endpoint, response code, and timestamp filters.

api requestsArraysData StructuresWalmart Global Tech
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3
System Design12 questions · ~165 min
Spark Job Failure TroubleshootingHard

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

distributed systemscomputational costfailure modesWalmart Global Tech
Explain Small Files Problem in SparkHard

Explain why excessive small files hurt Spark and Hadoop, then propose detection, prevention, and remediation strategies.

distributed systemsdata ingestioncomputational costWalmart Global Tech
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4
Pipelines12 questions · ~165 min
Optimize Spark and Kafka PipelinesHard

Design and optimize a reliable Walmart Global Tech pipeline using Scala Spark, SQL, Hive, Kafka, and Airflow.

data pipelinekafkaairflowWalmart Global Tech
Design Real-Time User Data PipelineMedium

Design a real-time user data pipeline processing 400K events/sec from app events and CDC into Snowflake with under 2-minute latency.

InfrastructureStream ProcessingData ModelingWalmart Global Tech
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5
Behavioral & Leadership3 questions · ~41 min
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