# 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.

100%  
Business parity — every rule and transaction preserved exactly

99.999%  
Code transformation accuracy across all COBOL/CICS programs

6 mo  
Average time from legacy scan to production deployment

70%  
Reduction in timeline vs. traditional manual approaches

## 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.

## 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.

## 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  
Transforms to ↓  
Java Spring Boot microservices  
REST APIs · Domain services

**Data & Storage**  
- VSAM KSDS / ESDS files  
- DB2 tables & stored procedures  
- QSAM / BSAM sequential file I/O  
- IDCAMS / DFSORT operations  
Transforms to ↓  
PostgreSQL · MongoDB  
Spring Data JPA · REST

**Batch & Infrastructure**  
- JCL jobs & PROC libraries  
- CICS regions & MQ queues  
- IBM Mainframe sort / IDCAMS  
- TWS / CA7 job schedulers  
Transforms to ↓  
Spring Batch · Apache Kafka  
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.

### COBOL Rule Extraction

Extracts logic from EVALUATE, PERFORM, and complex nested conditions — preserving rules never formally documented.

### Autonomous Java Generation

Generates production Spring Boot, Spring Batch, and REST APIs — not prototype stubs requiring manual cleanup.

### Air-Gapped & Secure

Runs entirely in your infrastructure. No COBOL source sent externally. Bring your own LLM. SOC 2 compliant.

## 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.