Unifying a legacy core with a real-time digital layer

The challenge

Meridian Bank had grown through acquisition, leaving it with a tangle of legacy cores, bespoke middleware, and dozens of brittle point-to-point integrations. Every new product meant months of custom plumbing, and each change risked breaking something elsewhere.

Leadership wanted to launch digital-first products quickly and safely — but the underlying architecture made even small changes slow, risky, and expensive. A full rip-and-replace was deemed too disruptive for a bank serving four million customers.

The approach

Working with Fyscal, Meridian adopted Catalyst X as a unifying middleware layer — an API-first, event-driven fabric that sat across the existing cores rather than replacing them. Pre-built connectors handled the heavy lifting of integration, while composable modules let teams assemble new capabilities from proven building blocks.

Delivery was sequenced in safe, measurable phases. Each workstream shipped independently behind automated, gated pipelines, with compliance controls engineered directly into every release.

“

We stopped rebuilding the same plumbing for every project. Catalyst X turned months of integration work into days.

Aarav Mehta, CTO, Meridian Bank

The results

Within five months, four core systems were unified into a single real-time platform — a migration originally scoped at eighteen. New products that once took quarters now reach market in weeks, and the bank maintains 99.99% uptime through high-availability, fault-tolerant infrastructure.

Just as importantly, compliance is no longer a quarterly fire-drill: DPDP, PCI-DSS, and AML controls run continuously inside the pipeline, keeping Meridian perpetually audit-ready.