Mainframe to Cloud Migration
Banking mainframes handle millions of transactions daily with zero downtime tolerance. Migrating COBOL systems to AWS requires replatforming and extensive testing.
AWS Application Modernization
Legacy Banking Application Modernization on AWS
Legacy financial systems cost millions annually in maintenance. We modernize banking platforms from mainframe/COBOL to cloud-native architecture, reducing operational costs and enabling innovation.
- The current estate is inventoried.
- Assessment models post-migration TCO and a 7R path per workload.
- Rehost moves what should move as-is, with MGN or DMS where they fit.
- Refactor lands what should land on managed services or containers.
- Cutover waits for the agreed window.
- The workload is live on AWS with the roster still attached.
Key Challenges We Solve
Transaction Consistency at Scale
Mainframes guarantee ACID transactions. Distributed cloud systems require careful design to maintain consistency without sacrificing scalability.
Regulatory Audit of New Architecture
Regulators require proof that new architecture meets the same compliance and audit standards as legacy mainframe systems.
Our Approach
Mainframe to AWS Replatforming
COBOL → Java or Python using automated translation tools, manual refactoring for business logic, and Oracle/DB2 → RDS/Aurora migration.
Distributed Transaction Architecture
Event sourcing, saga patterns, and eventual consistency models that scale beyond mainframe limitations while maintaining audit trails.
Zero-Downtime Migration
Dual-run architecture (legacy + new system in parallel), gradual traffic cutover, and automated reconciliation between old and new systems.
Frequently Asked Questions
How long does a mainframe migration to AWS take?
Typical mainframe migrations take 12-24 months depending on system complexity and lines of code. Phase 1 (assessment): 1-2 months. Phase 2 (replatforming): 6-12 months. Phase 3 (migration): 3-6 months.
Can we keep the mainframe running while migrating to AWS?
Yes. Dual-run architecture runs legacy and new systems in parallel. You gradually route transactions to AWS while keeping the mainframe as fallback. Once AWS proves stable, you decommission the mainframe.
What tools help with COBOL modernization?
Tools like AWS Application Migration Service (MGN), COBOL-to-Java compilers (IBM Rational, Micro Focus), and manual refactoring for complex business logic. We combine tools with expert engineers for quality refactoring.
Ready to Get Started?
Talk to our AWS experts about legacy banking application modernization on aws.