Engineering ·
Legacy Systems vs. Middleware: Deploying AI Without Rip-and-Replace
Replacing a core banking platform to add AI is rarely realistic. An overlay lets new capability sit on top of what already works.
Banks, insurers and microfinance institutions run on core platforms that have taken years to stabilise. A contact centre project that begins with "first, migrate the core" usually never begins. The alternative is middleware: a layer that connects to existing systems and presents a unified experience on top.
What an overlay does
Instead of replacing the CRM, ticketing tool or core banking system, the overlay reads from and writes to them through their existing interfaces, and gives the agent one screen in place of six. The systems of record stay exactly where they are.
A sensible rollout
- Start read-only: surface customer data to the agent before writing anything back.
- Integrate through supported APIs first. Where none exist, evaluate file-based or screen-level integration carefully, with the vendor's involvement.
- Pilot with one team and one use case, with agreed success measures set before launch.
- Add write-back and automation only after the read path is trusted.
- Keep your security team in the loop from day one: access controls, logging and data residency are architecture decisions, not afterthoughts.
Trade-offs to be honest about
An overlay adds a component to operate and secure, and it depends on the stability of the interfaces it uses. It is not a substitute for eventually modernising a failing core. What it does is let you improve the customer and agent experience now, on a timeline measured in weeks instead of years, while that longer decision is made on its own merits.