COBOL/CICS to
Cloud-Native Microservices
See how IONATE transformed a real-world banking application from IBM Mainframe COBOL/CICS to production Java microservices — 100% business parity, no big-bang cutover.
What the Demo Shows
A complete end-to-end transformation of Microsoft's Legacy Bank Application — from decades of COBOL/CICS mainframe code to production Kubernetes microservices.
The Legacy System
A production banking system on IBM Mainframe with COBOL/CICS business logic, VSAM file storage, DB2 tables, and JCL batch jobs. Decades of accumulated business rules never formally documented.
The Transformation
SOTERIA inventories the entire estate. APPDATE converts every COBOL program, CICS transaction, and JCL job to Java Spring Boot microservices with 99.999% accuracy — no manual rewriting.
The Result
Java microservices on Kubernetes. VSAM replaced with PostgreSQL. CICS transactions become REST APIs. JCL becomes Spring Batch. Observable, auto-scaling, cloud-agnostic.
Demo Access
Watch the Before/After Video
The full demo walks through each stage: SOTERIA discovery scan output, APPDATE's AI-driven Java generation, and the final Kubernetes deployment — with side-by-side code validation showing every business rule preserved to the last decimal.
Request access and we'll send you the demo link plus a companion white paper with full technical documentation of the transformation.
Side-by-side comparison of COBOL source and its Java microservices equivalent — including a live Kubernetes deployment walkthrough.
Request AccessD.A.T.E.D. Applied to COBOL
Five Phases. Zero Big-Bang Risk.
Every step AI-driven, every decision auditable — the mainframe keeps running until each service is validated in production.
Discover
SOTERIA scans your entire estate — every COBOL program, copybook, JCL job, CICS transaction, VSAM file, and DB2 schema. Full dependency mapping before any code is touched.
Analyze
Business rules extracted from every PERFORM, EVALUATE, and nested condition. Programs complexity-scored and risk-ranked. No sampling — 100% coverage, full audit trail.
Train
Domain-specific models learn your COBOL's unique dialect and business semantics — not generic patterns. Transformations preserve your exact logic, edge cases included.
Execute
APPDATE transpiles COBOL → Java Spring Boot, CICS → REST APIs, JCL → Spring Batch, VSAM → relational tables — 99.999% accuracy, 100% business rule preservation.
Deploy
KÍRKĒ orchestrates phased Kubernetes deployment. Mainframe runs uninterrupted until each service is validated and cut over. Cloud-agnostic: on-prem, AWS, Azure, or GCP.
KÍRKĒ — Modernization Process Management
Six phases from discovery to continuous delivery — no big-bang cutover at any point.
Before & After
Every COBOL/CICS/JCL component has a modern, open-source cloud-native equivalent.
Application Logic
- COBOL programs (.cbl / .cob)
- CICS transaction programs
- Copybooks & data structures
- PERFORM / EVALUATE / nested logic
REST APIs · Domain services
Data & Storage
- VSAM KSDS / ESDS files
- DB2 tables & stored procedures
- QSAM / BSAM sequential file I/O
- IDCAMS / DFSORT operations
Spring Data JPA · REST
Batch & Infrastructure
- JCL jobs & PROC libraries
- CICS regions & MQ queues
- IBM Mainframe sort / IDCAMS
- TWS / CA7 job schedulers
Kubernetes · Helm · CI/CD
The AI that makes COBOL transformation possible
MIRA Codex Studio is the intelligence layer behind every COBOL conversion — trained on 500M+ lines of legacy code, it extracts undocumented business rules, generates production-ready Java, and runs transformations autonomously in your own air-gapped infrastructure.
Explore MIRA Codex Studio ↗Ready to modernize your COBOL systems?
Start with a no-cost SOTERIA discovery scan — see exactly what you have, what it takes to modernize, and what the result will look like. Before you commit to anything.