Multi-channel notification system on Azure supporting push, email, SMS, and in-app notifications with Event Grid fan-out.
Difficulty: intermediate
Tags: notifications, push, email, sms, event-driven, azure
A notification system must reliably deliver messages across push, email, SMS, and in-app channels while respecting user preferences and rate limits. This Azure-native architecture uses Event Grid for fan-out — a single notification event triggers channel-specific delivery pipelines via Service Bus queues, each processed by Azure Functions with independent scaling and retry policies. Essential for product teams adding reliable multi-channel notifications with user preferences, rate limiting, and delivery tracking.