The Polling Problem
When building background sync operations, the naive approach is to poll the Microsoft Graph API or Google Workspace API every few minutes. However, polling at enterprise scale quickly leads to throttling, rate limiting (429 Too Many Requests), and massive, unnecessary compute costs.
Embracing Push Notifications (Webhooks)
To build a reliable background sync, CRMs must transition to webhook-based architectures. By subscribing to specific folder events, the Exchange or Google server pushes a notification to your endpoint the millisecond a new email arrives or a calendar event changes.
Handling Webhook Vulnerabilities
While webhooks are efficient, they are not foolproof. Servers can go down, and webhooks can be dropped. A resilient architecture requires:
- Delta Queries: To sync changes that occurred during downtime.
- Queueing Systems: Using Kafka or RabbitMQ to handle sudden spikes in incoming webhooks.
- Subscription Management: Automated background workers to renew expiring webhook subscriptions before they lapse.
Managing this infrastructure is incredibly complex, which is why utilizing a dedicated background sync provider is highly recommended for SaaS teams focused on core product features.