Core Banking Modernization: Engineering Trade-offs and 5 Companies to Evaluate

Core banking modernization involves updating systems while maintaining customer operations. A bank must handle data ownership, routing requests between old and new services, detecting incomplete or duplicated operations, and managing transactions during rollbacks. Phased migrations allow gradual replacement of legacy functionality, but teams need clear answers to manage the transition between systems.

Payment orchestration through multiple gateways provides operational flexibility but introduces ambiguities, such as delayed callbacks or repeated notifications. Design reviews should focus on idempotency, transaction status tracking, reconciliation, and provider-specific failure behavior. Mobile security and observability also require planning, including measures like certificate pinning and runtime application self-protection. However, these controls must be evaluated individually and do not guarantee payment completion.

Five companies offer relevant services for banking modernization: GeekyAnts, IBM Consulting, Dev Technosys, EPAM, and Globant. Each offers different expertise in migration boundaries, transaction reconciliation, rollback procedures, integration boundaries, data consistency, and support after deployment. Decision-makers should assess evidence like transaction-volume, availability, KYC outcomes, and latency, but they must also consider how these results were measured and whether they can be replicated elsewhere.