Design a scalable coffee ordering notification system

Q: Design a scalable coffee ordering notification system

This is a System Design interview question from Salesforce for Software Engineer roles. View the full question and solution on PracHub.

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Question

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Design an online coffee ordering system.

Core flow

Customers browse menus for nearby coffee stores, place orders, and pay.
Coffee stores receive orders, accept/reject, prepare them, and mark them ready.
Customers receive real-time status updates (e.g., accepted, in progress, ready).

Focus areas

How to scale the system (many stores, many customers, peak traffic).
How to coordinate notifications between customer and coffee store reliably.

Deliverables

APIs/services and data model
Order state machine and concurrency handling
Notification mechanisms (push/SMS/websocket), retries, and idempotency
Scalability, partitioning, and operational metrics

Design a scalable coffee ordering notification system

Core flow

Focus areas

Deliverables

Solution

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