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Plum Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 13 questions · ~113 min
Merge Overlapping Sorted IntervalsMedium
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Sort intervals by start time, then greedily merge overlaps into a non-overlapping result array.

intervalsSortingArray ManipulationPlum
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2
Metrics10 questions · ~87 min
HR Wellness Dashboard MetricsHard

Tests ability to define meaningful metrics and information architecture for a dashboard experience at Plum.

kpi hierarchyEngagement MetricsPlum
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3
Strategy10 questions · ~87 min
Compute LTV-to-CAC RatioMedium

Tests unit economics thinking and segmentation for LTV and CAC measurement.

unit economicscustomer lifetime valuePlum
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4
Security & Infrastructure6 questions · ~52 min
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5
Behavioral & Leadership3 questions · ~26 min
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6
More topics8 questions · ~70 min
Landing Page Conversion Test DesignMedium

Design a landing-page A/B test with clear metrics, power, and significance criteria while guarding against common experiment pitfalls.

Statistical SignificanceSample SizeA/B TestingPlum
Real-Time Claims Dashboard ArchitectureHard

Tests system architecture skills for real-time data aggregation and integration with external APIs.

InfrastructureAPIsData ModelingPlum
Monolith to Microservices MigrationHard

Tests migration planning, risk management, and strategies to maintain availability during refactors.

Launch PlanningTrade-offsRisk AssessmentPlum
Redesign Claims Filing FlowHard

Tests product sense for reducing user stress and improving mobile UX for insurance claims at Plum.

User Needsuser valuePain PointsPlum
System Design LeetCode-StyleHard

Evaluates end-to-end system design skills including APIs, data modeling, and scalability.

system designleetcodePlum
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