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Updated weekly · Last refresh Nov 12
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Duffel Interview Questions

The questions to prepare for Duffel interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
ExecutionStart here. 4 questions · ~32 min
Duffel Feature Ideation & PrioritizationMedium

Tests ability to ideate and methodically prioritize for Duffel’s platform.

Product VisionDDuffel
Prioritize Duffel's API IntegrationMedium

Evaluates prioritization skills for Duffel's API integrations.

api integrationFeature PrioritizationRoadmappingDDuffel
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2
System Design5 questions · ~40 min
Trade-offs in Database Partitioning and ShardingHard

Assesses understanding of data partitioning strategies and their impacts.

databaseshardingpartitioningDDuffel
Design a Server for External HTTP RequestsMedium

Tests system design for external service integration and request management.

httpDDuffel
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3
Technical Fundamentals3 questions · ~24 min
Networking at a ClickMedium

Tests knowledge of the web request lifecycle and networking basics.

NetworkinghttpDDuffel
HTTP/2 vs HTTP/1.1 PerformanceMedium

Evaluates knowledge of modern HTTP protocols and performance considerations.

WebhttpperformanceDDuffel
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4
Behavioral & Leadership5 questions · ~40 min
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5
More topics2 questions · ~16 min
Measure Developer Product SuccessMedium

Assesses metrics framing for developer-facing products at Duffel.

KPIsuccess metricsDDuffel
How TLS WorksMedium

Assesses understanding of secure transport protocols.

tlsCommunicationSecurityDDuffel

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