Proposed Architecture The design you're moving towards aligns well with scalability and performance. By separating roles and leveraging Azure services, you can ensure a robust real-time notification system while maintaining responsiveness and scalability.

Architecture Overview Web Role 1: Website Handles front-end interactions like the "Follow" button click. Sends notifications (NotificationItem) to an API endpoint in Web Role 3 (Notification Processor). Web Role 2: SignalR Hub Dedicated to managing SignalR connections and pushing updates to clients. Subscribes to Azure Service Bus Topic for real-time updates. Web Role 3: Notification Processor Processes notifications and stores them in Azure Table Storage or Cosmos DB. Publishes a message to an Azure Service Bus Topic for SignalR. Azure Service Bus Backbone for decoupled communication: Queue: One-to-one message delivery (e.g., processing tasks). Topic: One-to-many message delivery (e.g., broadcasting notifications). Workflow: Step-by-Step

1. User Action User1 clicks "Follow," triggering an API call to the Notification Processor.

2. Process the Notification The NotificationProcessor: Processes the notification (e.g., "User1 is now following you"). Saves it to Azure Table Storage.

3. Publish to Azure Service Bus { "RecipientId": "User2", "Message": "User1 is now following you", "Timestamp": "2025-02-03T12:34:56Z" }

4. SignalR Hub: Real-Time Delivery The SignalR Hub subscribes to the Service Bus Topic and listens for messages: Clients.Group(recipientId).notifyUser(notificationData);

5. Client Update User2 (connected to the SignalR Hub) receives the notification instantly. Code Examples SignalR Hub: Authorization Use JWT Tokens for authentication and assign users to groups: