An external system integrates with Salesforce using REST APIs and works fine at first. As usage increases, failures start appearing—timeouts, partial updates, or API limit issues. Nothing major changed in the code. I want to understand why integrations degrade over time and how teams usually design for long-term stability?
Most integrations are built and tested with small volumes and ideal conditions. As real usage grows, API limits, retry storms, data quality issues, and unhandled edge cases start surfacing. Salesforce is especially sensitive to inefficient request patterns and excessive synchronous processing.
Stable integrations usually rely on batching, idempotent design, proper error handling, and asynchronous processing. Monitoring and backoff strategies are just as important as the initial implementation.
Takeaway: Integration stability depends more on architecture than on initial correctness.