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Updated weekly · Last refresh Aug 30

Inflection Interview Questions

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

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1
CodingStart here. 4 questions · ~34 min
Thread-Safe LRU Cache with TTLHard
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Implement an O(1) average-time LRU cache with per-entry expiration using a hash map, doubly linked list, and thread-safe access.

Hash TablesLinked ListsHeapInflection
Memory-Constrained Algorithm OptimizationHard

Tests ability to reduce memory usage while preserving correctness and performance.

Algorithmsperformance analysisInflection
Shortest Path in Dynamic NetworksHard

Tests algorithmic thinking and ability to implement shortest-path logic under changing conditions.

Dynamic Programmingshortest pathGraphsInflection
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2
Behavioral & Leadership30 questions · ~256 min
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3
More topics5 questions · ~43 min
Distributed Web Crawler ArchitectureHard

Tests system design for large-scale crawling, scheduling, and rate-limit compliance.

distributed systemsInflection
Exactly-Once Ingestion PipelineHard

Tests pipeline design for correctness guarantees, idempotency, and failure recovery.

Stream Processingdata ingestionInflection
Scaling Write-Heavy DatabasesHard

Tests database scaling strategies, write amplification control, and operational tradeoffs.

Trade-offsInflection
A/B Testing FundamentalsMedium

Evaluates understanding of experimental design and metrics for making data-driven decisions.

analyticsA/B TestingInflection
Rate-Limited API Service DesignHard

Tests system design for availability, throttling, and safe request handling under load.

api designrate limitinghigh availabilityInflection

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