COBOL to C Migration

Many organizations still rely on mission-critical COBOL applications developed decades ago. Zwiegnet offers professional COBOL to C migration services to modernize these systems, reduce maintenance costs, eliminate mainframe dependency, and improve performance and maintainability.

We follow a proven, low-risk methodology to ensure functional equivalence and a smooth transition.

Our migration process includes:

• Code Analysis & Assessment – Detailed inventory of COBOL programs, COPYBOOKs, JCL, CICS, DB2/SQL, VSAM files, and dependencies.
• Data Migration – Conversion of VSAM, sequential files, and databases (DB2, IMS) to modern formats like PostgreSQL, MySQL, or flat files.
• Automated Code Translation – Use of advanced tools and custom scripts to convert COBOL logic to ANSI C where possible, minimizing manual rework.
• Manual Refactoring – Hand-optimization of complex sections (e.g., CICS screens to curses or web interfaces, arithmetic precision handling).
• Platform Migration – Porting to Linux (AlmaLinux, Oracle Linux, Ubuntu) or Unix environments with native compilation using GCC or Clang.
• Testing & Validation – Unit testing, integration testing, regression testing, and parallel runs to verify identical results.
• Performance Tuning – Leveraging C’s efficiency for significant speed improvements over interpreted COBOL.
• Documentation & Training – Updated technical documentation and knowledge transfer to your team.
• Post-Migration Support – Ongoing maintenance and enhancements in the new C codebase.

Benefits include lower operating costs, easier recruitment of developers, better integration with modern systems, and future-proofing your applications.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct, personal service with deep experience in legacy system modernization.