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Walmart Global Tech Data Scientist Interview Questions

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

50questions
~7htotal time
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1
Machine LearningStart here. 10 questions · ~81 min
Machine Learning Framework ExperienceEasy

Discuss your hands-on experience with machine learning frameworks and how you use them for training, preprocessing, and evaluation.

Hyperparameter TuningNeural NetworksDeep LearningWalmart Global Tech
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2
Model Evaluation7 questions · ~57 min
Choosing Model Evaluation TechniquesEasy
Recently asked

Explain how you evaluate models using the right metrics, validation strategy, and error analysis for the problem.

PrecisionAccuracyRecallWalmart Global Tech
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3
Metrics5 questions · ~40 min
Analyze Campaign Metrics That MatterEasy
Recently asked

Explain how you evaluated a marketing campaign using funnel, efficiency, and business outcome metrics.

KPIsLeading IndicatorsDiagnosisWalmart Global Tech
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4
Statistics & Probability7 questions · ~57 min
Statistical Significance in Hypothesis TestingEasy
Recently asked

Explain what statistical significance means and why it matters when interpreting experimental or analytical results.

Hypothesis TestingData AnalysisStatistical SignificanceWalmart Global Tech
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5
SQL & Data Manipulation9 questions + 3 drills · ~103 min
Handling Missing and Dirty SQL DataMedium
Recently asked

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQualityWalmart Global Tech
SQL: Manager of ManagerMedium
Practice
Practice drill

Use self-joins to return each Walmart employee, their manager, and their manager's manager.

JoinssqlWalmart Global Tech
Second Highest Without AggregatesHard
Practice
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
Running Total With Window FunctionsEasy
Practice
Practice drill

Calculate each user's running order total over time using a window function.

Window FunctionsDate FunctionsRunning TotalsInspire11Western DigitalFactual
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6
System Design4 questions · ~32 min
Design a Personalized Product RecommenderHard
Recently asked

Design an end-to-end product recommendation system for a large e-commerce marketplace with strict latency and freshness needs.

Feature StoreFeature DriftModel ServingWalmart Global Tech
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7
More topics8 questions · ~65 min
Common Pitfalls in Experiment ResultsHard
Recently asked

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchWalmart Global Tech
Design User Engagement MetricMedium

Tests metric design and operationalization for measuring FIRSTNET GLOBAL user engagement.

product metricsdesignuser engagementWalmart Global Tech
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.