It’s everything the new platform has to connect to.
The pitch is always clean. One system. Modern, supported, everything in one place. And sometimes the old core genuinely does have to go. That part can be true. But the core is rarely where the difficulty lived.
The difficulty lived in each connection. The data flows, the edge cases, the decades of business rules baked into how your systems actually talk to each other. Replace the core, and that work doesn’t disappear. It moves. And it’s almost always bigger than the demo suggested.
Before software, I worked in metallurgy. Failures usually happen at the joints, where two things meet and the stress concentrates.
You can buy a new platform. You can’t buy your way out of the integration.
The buyers who get this right tend to do the same few things before they sign:
- Map where the complexity actually lives before choosing the platform.
- Treat integration as part of the project, not a line item at the bottom of the quote.
- Ask who owns each connection, and what happens when one doesn’t fit the standard pattern.
- Allow for the work that discovery hasn’t exposed yet.
Replacement can be the right call. Just buy it with your eyes open.
If you’re weighing a platform replacement and want a clear read on where the real difficulty sits, happy to talk it through.
