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Grainger Software Engineer Interview Questions

The questions to prepare for a Grainger Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~8htotal time
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1
CodingStart here. 10 questions · ~92 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysGrainger
Two Sum ProblemEasy
Practice

Find two indices in an array whose values add up to a target using a hash map.

Hash TablesArraysTwo PointersGrainger
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2
System Design7 questions · ~65 min
Design Feature Drift Monitoring SystemHard

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingGrainger
Design a Marketplace Recommendations StackMedium

Design a personalized recommendations system for a large e-commerce marketplace with strict latency, freshness, and monitoring needs.

InfrastructureFeature StoreModel ServingGrainger
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3
Execution9 questions · ~83 min
Build a Feature From Ambiguous RequirementsEasy

Describe how you handled vague feature requirements by clarifying scope, aligning stakeholders, and making trade-offs to ship effectively.

Trade-offsRisk AssessmentScope ManagementGrainger
Balance Speed, Quality, and ScopeMedium

Describe how you handled a tough trade-off between shipping fast, maintaining quality, and reducing scope.

Trade-offsRisk AssessmentScope ManagementGrainger
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4
Behavioral & Leadership22 questions · ~203 min
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5
More topics2 questions · ~18 min
Ensuring Data ConsistencyHard

Tests your understanding of distributed consistency models and tradeoffs.

InfrastructureQualityGrainger
Database Performance OptimizationMedium

Tests your skills in query tuning, indexing, and database performance troubleshooting.

JoinsindexesGrainger
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice
Practice drill

Calculate the monthly spending trends for customers using window functions and joins.

The Home DepotAvisoWorld Wide Technology
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Resolve Conflicting Customer AttributesMedium
Practice
Practice drill

Use joins, CTEs, and row ranking to resolve conflicting customer profile values across ACME House systems.

JoinsData WranglingQualityRamsey SolutionsACME House
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.