Legacy Modernisation
Phased modernisation of core banking and legacy platforms, run alongside live operations — replacing what's holding you back without stopping the business.
- No big-bang cutover
- Live during migration
- Audit-ready
Modernise without stopping the business.
We replace legacy core banking and platform systems in controlled phases — running the new system alongside the old until it's proven, then cutting over with minimal risk. Nothing goes offline, and nothing breaks silently.
Built to replace the old system without betting the business on a single cutover.
What We Deliver
Six areas of work that make up most legacy modernisation engagements.
Legacy System Assessment
An audit of the legacy platform: dependencies, risks, and what can't break.
Strangler Fig Migration
Incremental replacement of legacy components without a full rewrite.
Data Migration & Validation
Moving and reconciling data between old and new systems, in phases.
Core Banking Modernisation
Replacing core banking systems that were never built to change.
Parallel-Run & Cutover
Running old and new systems side by side until the new one is proven.
Zero-Downtime Rollout
Migration sequencing that keeps the business running throughout.
Our Process
A five-stage engagement, from legacy audit to decommission.
Assess
Audit the legacy platform: dependencies, risks, and what can't break.
Plan
Sequence the migration into phases that ship value without a big-bang cutover.
Build
Build the modern replacement alongside the legacy system, not instead of it.
Migrate
Move data and traffic in controlled phases, validating at every step.
Retire
Decommission the legacy system once the new platform carries full load.
Fintech Application Development
Customer and back-office applications for regulated products.
Payment Systems Engineering
Payment switches, gateways, and settlement flows.
API Development
Documented, versioned APIs for partners and products.
Microservices Architecture
Domain-driven services that scale independently.
Let's modernise your next platform.
Tell us what you're building or modernising — a member of the Unlock team will get back to you.