Digital Banking Platforms: Composability ≠ Plug and Play

Composability and modularity can make it easier to implement disparate systems, but they do not magically remove integration complexity. A modular architecture helps because you can separate capabilities into smaller components and microservices with clear responsibilities. That usually makes it easier to replace a single piece of functionality, add a new solution, or integrate a specialized point system without rewriting the whole stack. In digital banking, that matters because banks often need to connect onboarding, payments, servicing, CRM, fraud, core systems, treasury, and document workflows that were never designed to work together.

But composability only works well when the bank has a strong integration foundation. If the modules have inconsistent data models, poorly written APIs, overlapping business logic, or different entitlement structures, the result is often more complexity, not elegant integrations. You can’t eliminate the hard work of orchestration, API management, identity, data mapping, workflow design, and governance.

The misconception is when people hear “composable” and assume “plug and play.” Modularity can help add targeted capabilities, improve customer journeys, reduce vendor dependence, and accelerate change. But it can also disappoint when legacy cores remain difficult to access, key business logic is inaccessible, and architectural governance is lax.

Solution providers like Backbase are announcing new capabilities, such as Banking OS (https://lnkd.in/ewf-z6xQ), an AI-native “Operating system purpose-built for banking - with shared context, coordinated execution and controlled governance.” For those of you who have implemented solutions that claim to be modular and composable, what has your experience been? Did it reduce the integration burden?