Zero-Downtime Core Banking Modernization: A Lead Engineer's Critical Review

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A lead engineer reviews a GeekyAnts article arguing that banks can modernize legacy core systems without planned outages. The piece frames modernization as disciplined decoupling rather than a full rip-and-replace. Its proposed architecture places strict API boundaries between customer channels and the central ledger, and replaces overnight batch jobs with event-driven designs using tools like Kafka or Kinesis. The reviewer judges the blueprint structurally sound but flags three operational risks: reconciliation drift during parallel running, undocumented customizations in legacy code, and the need for careful human verification. The critique concludes that leaders need tighter planning to execute such transitions safely.

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