Project Overview
City Bank’s core banking system (COBOL on mainframe) was expensive and hard to maintain. Intelirate executed a phased migration to a modern Java/Spring stack on AWS.
Services Provided
- Strangler pattern migration – one module at a time
- Re‑engineered account management, transactions, and reporting
- API gateway for backward compatibility
- Comprehensive regression testing suite
- Disaster recovery and multi‑AZ deployment
Results Achieved
- Zero downtime during 9‑month migration
- Mainframe costs reduced by 70% after cutover
- Transaction processing speed improved 5x
- Developer productivity up 3x (modern tooling)
Client Feedback
“Intelirate pulled off what others said was impossible. Their team managed risk brilliantly.”
Tech Stack
- Java (Spring Boot), Kafka, PostgreSQL
- AWS (ECS, RDS, S3, Lambda)
- Terraform, Jenkins, JUnit