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Updated weekly · Last refresh Oct 17

Dunkin' Software Engineer Interview Questions

The questions to prepare for a Dunkin' Software Engineer interview. Questions from real interview reports rank first. Updated daily.

26questions
~4htotal time
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1
ExecutionStart here. 11 questions · ~98 min
Disagreeing on Technical DirectionEasy

Explain how you handled a disagreement over technical direction while balancing delivery, relationships, and business outcomes.

Trade-offsRoadmappingRisk AssessmentDunkin'
Escalate and Contain Critical BugEasy

Describe how you handled a critical bug by assessing risk, aligning stakeholders, defining severity, and driving containment to resolution.

Success CriteriaRisk AssessmentQualityDunkin'
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2
Pipelines8 questions · ~71 min
Modernize Legacy with New Cloud TechHard

Tests architectural reasoning, modernization tradeoffs, and collaboration in tech strategy.

InfrastructureToolsData ModelingDunkin'
Design for Morning Traffic SpikesHard

Tests system design for high availability, scalability, and performance under extreme demand.

InfrastructureSchedulingDependenciesDunkin'
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3
Coding4 questions · ~36 min
Finding Duplicate Orders in LogsMedium
Practice

Sort transaction logs and return each earlier order with a subsequent order placed within 60 seconds.

Hash TablesdeduplicationArraysDunkin'
Modernize Legacy Code for PerformanceMedium

Tests refactoring strategy, performance thinking, and risk management when improving existing systems.

Hash TablesArraysSortingDunkin'
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4
More topics3 questions · ~27 min
Optimize Slow Queries at PeakMedium

Tests SQL performance troubleshooting and practical tuning under production constraints.

Joinsquery optimizationAggregationsDunkin'
Relational and NoSQL for TransactionsHard

Tests data modeling choices and throughput-focused database architecture.

JoinsData WranglingAggregationsDunkin'
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL for Store Performance InsightsHard
Practice
Practice drill

Aggregate daily Dunkin sales, staffing, and inventory data to find stores with simultaneous low sales, understaffing, and stockouts.

JoinsGroup ByCase WhenDunkin'
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
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
The finish line: interview-readyComplete all 26 questions plus 3 hands-on drills to finish this plan.