Complete core banking platform migration to Sibyl Cloud with 99.99% uptime SLA, real-time payment processing and PCI DSS Level 1 compliance.
The client, a major commercial bank with 1.2 million customers, was running a COBOL-based core banking system dating back to 2003. The system required weekly maintenance windows, could not support real-time payments, and was a significant barrier to launching digital products.
The bank had attempted two previous migrations that both failed — once after 18 months of work — resulting in deep internal scepticism about the feasibility of any modernisation programme.
We began with a 6-week discovery phase, producing the most comprehensive documentation of the existing system the bank had ever had. This became the foundation for a phased migration plan with rollback capability at every stage.
Migration was executed in 12 waves over 7 months, with zero planned downtime and a 24/7 war room during each wave cutover. Every wave was validated with live transaction shadowing before permanent cutover.
After two failed attempts with other vendors, Sibyl delivered a flawless migration. The phased approach and rollback capability meant our board could approve each wave with confidence.
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