Didi Labs Software Engineer Interview Questions

The questions to prepare for a Didi Labs Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

17questions

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CodingStart here. 5 questions · ~45 min

Determine a generalized Tic Tac Toe result using row, column, and diagonal counters with O(n) auxiliary space.

Custom Cache Eviction PolicyHard

Tests cache design, concurrency control, and eviction strategy trade-offs under load.

abstractionData StructuresHeap

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Dynamic Shortest Path RoutingHard

Tests ability to design and implement pathfinding under dynamic conditions relevant to ride routing.

SearchingAlgorithmsGraphs

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Behavioral & Leadership7 questions · ~63 min

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More topics5 questions · ~45 min

Tests resilience design, traffic shaping, and protection mechanisms for microservices.

Low-Latency Ride MatchingHard

Tests system design for low-latency matching and coordination between riders and drivers.

Feature StoreRetrievalRecommendation Systems

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Latency vs Consistency Trade-offHard

Tests decision-making under conflicting requirements and ability to justify engineering trade-offs.

Decision MakingTrade-offsScope Management

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Geospatial Tracking at ScaleHard

Tests data modeling, ingestion pipelines, and storage strategies for large-scale real-time location data.

InfrastructureStream ProcessingQuality

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Highly Available Routing EngineHard

Tests availability, routing architecture, and consistency of dynamic ETA computations.

ML RankingFeature DriftModel Serving

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