DoorDash Platform Architecture Patterns Questions

Domain oriented architecture patterns and trade offs used in on demand delivery marketplaces. Topics include resilient payout and payment systems with idempotency and reconciliation, application programming interface aggregation patterns for composing consumer responses, real time location tracking and event propagation, marketplace matching algorithms and the trade offs between centralized and decentralized approaches, event driven and streaming designs for throughput and latency, and operational concerns such as monitoring and graceful degradation. Interviewers will evaluate understanding of failure modes, correctness requirements, and design choices for low latency and high availability systems.