Legacy systems can usually be integrated with modern software by adding an API layer in front of them, using scheduled file exchanges, connecting to their database carefully, or placing an integration service between old and new systems. The right option depends on what the legacy system supports and how reliable the connection must be.
Integration options for older systems
- Use an existing API if the system has one, even an old one
- Build an API layer that wraps the legacy system
- Exchange files on a schedule (exports and imports)
- Read from or write to the database directly, with great care
- Use an integration service to translate between old and new formats
Risks to manage
- Undocumented behaviour and business rules inside the old system
- Performance limits when the system receives more requests
- Data quality and format inconsistencies
- Security gaps in older authentication methods
A safe approach
- Assess what the legacy system can support and how it is used today.
- Start with read-only access before writing data back.
- Add monitoring and alerts from day one.
- Integrate one flow at a time and test with real data.
Integration as a step toward modernization
Wrapping a legacy system with APIs often becomes the first stage of modernization: new tools connect to the API, and the system behind it can later be replaced in stages without disrupting everything that depends on it.
Want help putting this into practice? Explore our Systems Integration services.
Have systems that don't communicate?
Discuss Your Integration