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Didi Labs Interview Questions

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

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1
CodingStart here. 5 questions · ~45 min
Tic Tac Toe Winner in O(n)Medium
Practice

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

Didi Labs
Custom Cache Eviction PolicyHard

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

abstractionData StructuresHeapDidi Labs
Dynamic Shortest Path RoutingHard

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

SearchingAlgorithmsGraphsDidi Labs
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2
Behavioral & Leadership7 questions · ~63 min
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3
More topics5 questions · ~45 min
Low-Latency Ride MatchingHard

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

Feature StoreRetrievalRecommendation SystemsDidi Labs
Geospatial Tracking at ScaleHard

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

InfrastructureStream ProcessingQualityDidi Labs
Latency vs Consistency Trade-offHard

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

Decision MakingTrade-offsScope ManagementDidi Labs
Rate Limiting for MicroservicesMedium

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

InfrastructureAPIsAutomationDidi Labs
Highly Available Routing EngineHard

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

ML RankingFeature DriftModel ServingDidi Labs

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