Notification Service

Delivery guarantees (typical)

• Maintain WebSocket connections.

• Manage subscription state and filtering rules.

• Dispatch low-latency updates.

• Deliver webhook notifications.

Responsibilities

The notification service owns event delivery and real-time fanout. It prevents clients from needing to poll for updates.

• Retries for transient delivery failures.

• Backpressure to protect the system under subscriber load.

• Clear error signaling when subscriptions are invalid.

If you need reliability, use webhooks with idempotent handlers. If you need latency, use WebSockets with reconnect logic.