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Prep plan
Updated weekly · Last refresh Sep 26

Hopper Backend Engineer Interview Questions

The questions to prepare for a Hopper Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 7 questions · ~79 min
All Routes From Origin to DestinationMedium
Practice

Use DFS and backtracking to return every cycle-free route between two airports.

Hopper
Identical Binary TreesEasy
Practice

Determine whether two binary trees have identical structure and values using recursive tree traversal.

comparisonTreesHopper
Design API Rate LimiterHard

Explain a queue-based, stateful rate limiter for concurrent workers calling third-party APIs safely and efficiently.

APIsabstractionrate limitingHopper
Shortest Path in Weighted GraphHard

Evaluates graph algorithm selection and correctness for shortest path problems.

shortest pathAlgorithmsGraphsHopper
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2
System Design5 questions · ~57 min
Caching Global Inventory DataMedium

Evaluates cache design choices for latency, freshness, and correctness at global scale.

inventory managementsystem architecturecachingHopper
Flight Booking Under Peak LoadHard

Assesses system design for scalability, reliability, and consistency during high-demand booking flows.

system designbooking systemHopper
SQL vs NoSQL for InventoryMedium

Evaluates data modeling and storage trade-offs for inventory workloads and access patterns.

Trade-offsinventory managementHopper
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3
Behavioral & Leadership5 questions · ~57 min
Owning a High-Stakes Production BugEasy

Tests ownership in debugging, structured root-cause analysis, and clear communication during a production issue.

CommunicationOwnershipHopper
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The finish line: interview-readyComplete all 17 questions to finish this plan.