Home / Case Studies / Core Banking Modernization
Case Study

Core Banking Modernization

Transform core banking system from legacy COBOL mainframe to modern microservices architecture. Migrated 5 million accounts and 10 years of transaction history with zero downtime, reducing feature deployment time from 6 months to 2 weeks.

ClientNational Bank
IndustryFintech
Build a Similar System →
Core Banking Modernization
5M
Accounts migrated
0
Downtime

Challenge

Core banking on IBM COBOL mainframe since 1995, every small change took 3-6 months due to complex testing process and tight coupling. Young developers don't know COBOL, difficult to recruit and maintain. Cannot deploy modern mobile banking and API banking.

Solution

Applied Strangler Fig pattern: built Java + Spring Boot microservices in parallel with mainframe, gradually migrating modules. Kafka Change Data Capture (CDC) for real-time data sync between systems. API Gateway routes requests to legacy or new system.

Technology Used

JavaKafkaPostgreSQLKubernetes

Results

  • 5M — Accounts migrated
  • 0 — Downtime

Need a similar system?

Contact us for architecture consulting, pricing, and timeline for your project.

Free Consultation →