Map the system of record
Before connecting tools, decide which system owns each important type of information. Integration becomes unstable when two applications can overwrite the same field without a clear authority.
Choose the simplest reliable connection
Direct APIs can be appropriate for a small number of stable systems. An integration layer is useful when transformations, retries, monitoring, or multiple destinations must be managed consistently.
Modernize at the boundaries first
You can often improve the experience without replacing the core system. Add a focused portal, automate handoffs, or expose a cleaner interface while keeping validated business logic in place.
- Document ownership and direction of data
- Design for retries and duplicate events
- Log status without exposing sensitive content
- Test partial failure and recovery