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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
System DesignStart here. 5 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
Evolve a Single-Threaded Backend for ScalabilityHard

Evaluates strategy for scaling a service-heavy, search/booking workflow.

scalabilityarchitectureDDuffel
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2
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
Cache Invalidation for Updated CSSMedium

Tests caching strategies and cache-busting techniques for static assets.

csscacheDDuffel
3
Behavioral & Leadership4 questions · ~32 min
Making an Unpopular Team DecisionHard

Tests judgment under pressure: making an unpopular decision, explaining trade-offs clearly, and maintaining team trust and execution.

Conflict ResolutionCommunicationLeadershipDDuffel
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4
More topics1 question · ~8 min
How TLS WorksMedium

Assesses understanding of secure transport protocols.

tlsCommunicationSecurityDDuffel

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