Your question is Real-Time Orders and Dasher Dashboard. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a real-time dashboard that tracks active orders and Dasher locations across a city on DoorDash.
Define the event sources, streaming ingestion and processing architecture, state model, storage layer, and dashboard-serving interface. Explain how you handle event-time ordering, duplicates, late events, Dasher location updates, order-state transitions, data quality, and recovery after failures. Provide a practical design with specific technologies, schemas, monitoring, and operational trade-offs.
