COBOL Development
We read, maintain, extend, and modernize COBOL programs. Whether you need a new batch routine, a bug fixed in existing code, or a path toward modernization, we work in the language your system runs in before recommending changes to it.
Capabilities
What we do with COBOL
We work in existing COBOL codebases before recommending changes to them. The goal is to understand the program's intent before touching a line.
New routines
Batch Program Development
New COBOL batch programs written to the standards of the existing shop: naming conventions, copybook structure, error handling, and ABEND management consistent with what is already running.
Production defects
Bug Investigation and Repair
We trace ABENDs, incorrect output, and data integrity issues to the source program and fix them without introducing regressions in adjacent programs.
Online systems
CICS Transaction Programs
COBOL programs that run under CICS for interactive terminal or web-facing workloads, including map handling, COMMAREA design, and CICS command-level API usage.
KSDS · ESDS · RRDS
VSAM File Processing
Sequential and indexed VSAM file processing for high-volume data movement, sorting, merging, and transformation workloads that run reliably in the batch window.
Migration strategy
Legacy Modernization Planning
We assess what the program does, document the business rules embedded in it, and produce a modernization plan that does not assume the mainframe can simply be turned off.
MQ · REST bridge
API Integration
Connecting COBOL programs to modern systems through IBM MQ, REST APIs, or data extraction routines so that mainframe data can feed downstream applications without a full rewrite.
Our approach
Read the code before changing it
COBOL programs frequently carry decades of business logic in implicit conventions: field naming, paragraph structure, PERFORM sequences. We read the existing code thoroughly before touching it so that we understand what it does, not just what it looks like.
Respect the batch window
Mainframe batch jobs run on tight schedules with dependencies upstream and downstream. We scope changes to avoid extending run times and test in a staging environment that mirrors the production job stream before deploying.
Modernization without disruption
A working COBOL program is an asset. We do not recommend rewrites unless the business case is clear and the migration path is fully understood. Incremental modernization through API wrappers, data extraction, and service boundaries often delivers more value with less risk.
Documentation as a deliverable
Legacy COBOL codebases are frequently underdocumented. We produce clear documentation of program logic, data layouts, and interface contracts as part of every engagement, so the team that maintains the code after us has what they need.
All engineering work is done by US-based engineers. We do not offshore any development or architecture work.
Part of our software engineering services. We work across the full stack, cloud platforms, and architectural patterns.
FAQ
Common questions
Virginia · United States
Need COBOL expertise?
If you have a mainframe program that needs attention and want engineers who will read the code before recommending changes, reach out and we will assess the situation.