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Google Backend Engineer Interview Questions

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

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Detect Cycles in GraphsMedium

Explain how to detect cycles in directed and undirected graphs using DFS, recursion state, and parent tracking.

RecursionSearchingGraphs
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Thread-Safe O(1) LRU Cache
Hard

Tests ability to design a concurrent data structure with strict time complexity guarantees.

thread safetycachingData Structures
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Merge Overlapping Intervals
Medium

Tests algorithmic efficiency for interval processing at scale.

intervalsdata processingoptimization
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Failure Handling With Critical Integrity
Hard

Evaluates reliability strategies, consistency guarantees, and failure-mode planning.

distributed systemsdata integrity
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Database Architecture Trade-offs
Medium

Evaluates system design judgment for performance, consistency, and operational complexity.

Trade-offsdatabase architecture
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Photo Storage Consistency Across Regions
Hard

Assesses system design for multi-region consistency, availability, and correctness.

distributed systemsscalabilitydata consistency
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Hash Map vs BST Trade-offsMedium

Assesses data structure selection and complexity trade-offs for a concrete requirement.

Trade-offsperformanceData Structures
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Scale Algorithm for 100x
Hard

Evaluates performance reasoning, scalability, and adaptation of algorithms under growth.

performancescalability
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