Decades of point releases, regulatory change, and product expansion have left banks with increasingly complex integration estates. The core may still work. The architecture surrounding it is often what constrains speed, interoperability, and change.
This guide explores how banks can modernise incrementally using an API-led architecture rather than committing to a high-risk core rewrite. It examines proven patterns across payments, lending, KYC and onboarding, Customer 360, and trade finance, drawing on more than 30 live banking programmes.
The approach combines governed APIs, microservices, routing and adapter layers to progressively decouple business capabilities while the existing core continues to operate.
Download the Reference Architecture Guide to explore how banks can reduce integration debt, accelerate ecosystem connectivity, and establish a measurable first modernisation proof point within 90 days.
