Incremental Core Replacement
Big-bang migrations destroy banks. Fernel enables a strangler-fig architecture. Extract ledgers and payments module by module.
Legacy mainframes run on batch processing. They cannot support 24/7 instant payments or real-time ledger reads. Ripping them out entirely is a multi-year risk.
The alternative, the one that works, is incremental. Run the new system alongside the old one. Migrate one product line, one payment type, one customer segment at a time. Prove value at each step. The old core shrinks gradually. The new one grows.
How FERNEL Fits Your Stack
| Your Need | FERNEL Capability | Module |
|---|---|---|
| Incremental adoption | Modular architecture. Adopt the ledger first, payments later, compliance when ready. | Ledger |
| Run alongside legacy | Multi-tenant isolation. FERNEL operates as a parallel core for new products. | Ledger |
| ISO 20022 native | No format conversion layer. Native message models for clearing integration. | Connectivity |
| Standards-based integration | camt.053 statement import, reconciliation against legacy GL | Connectivity |
| Durable workflows | Payment execution, account migration as orchestrated, recoverable processes | Workflows |
| DORA alignment | Architecture designed for DORA Art. 5-27 requirements | Security |
The Sidecar Pattern
Fernel runs parallel to the legacy core. Synchronize state continuously. Move workloads when you are ready.
Start Small. Prove Value. Then Scale.
Talk to our team about your core modernization strategy.