Legacy Systems

Legacy Systems Maintenance | Stop Gap Software Solutions — COBOL Mainframe Support
95% of ATM transactions run on COBOL $3 Trillion in daily commerce processed by legacy systems COBOL developers retiring faster than replacements are trained Your system won’t wait for a modernization plan We keep the lights on 40+ years of mainframe expertise 95% of ATM transactions run on COBOL $3 Trillion in daily commerce processed by legacy systems COBOL developers retiring faster than replacements are trained Your system won’t wait for a modernization plan We keep the lights on 40+ years of mainframe expertise

Legacy Systems Expertise

Keep The Lights On. Keep The Business Running. COBOL · JCL · VSAM · CICS · DB2 · MVS · z/OS

Your 60-year-old COBOL system isn’t a liability — it’s a proven asset. The real risk is losing the people who know how to maintain it. We step in before that happens.

220B
Lines of COBOL still in active production worldwide
$3T
Daily commerce processed by legacy mainframe systems
95%
Of ATM transactions still run on COBOL code
40+
Years of hands-on mainframe expertise we bring to your team

The Expert Who Kept It Running Just Retired.

Across banking, insurance, government, and healthcare — the same crisis is unfolding. The systems are fine. The people who understand them are leaving.

Modernization projects take years and carry enormous risk. In the meantime, your production batch jobs still need to run. Your VSAM files still need maintaining. Your JCL still needs tuning.

That’s exactly where we come in. We are the stop gap — the experienced hand that keeps your critical systems stable while you figure out your long-term strategy.

The Retirement Cliff

The average COBOL developer is over 55. Institutional knowledge is walking out the door at an accelerating pace.

Undocumented Logic

Decades of business rules are buried in code with no documentation. One wrong change can cascade through the entire system.

Failed Modernization

Most legacy migration projects fail or go massively over budget. The safer play is stabilization first — migration later, if ever.

No Backup Plan

When the production batch fails at 2am, who do you call? If the answer is unclear, that’s your biggest risk.

Legacy Systems Maintenance Services

Focused, expert-level support to keep your mission-critical legacy platforms stable, documented, and sustainable.

01

Stabilization Audit

A comprehensive review of your COBOL, JCL, and VSAM environment to identify risks before they become crises.

  • Undocumented logic identification
  • Single point of failure analysis
  • Risk-prioritized remediation roadmap
  • Written findings report
02

Knowledge Capture

Before your last legacy expert walks out the door, we capture and document everything they know.

  • Business rules extraction from code
  • Annotated code documentation
  • Operations runbooks
  • Onboarding materials for new staff
03

Ongoing Maintenance

Monthly retainer for continuous support — your on-call legacy expert without the full-time headcount.

  • Bug fixes and production support
  • Regulatory-driven code changes
  • Batch job tuning and optimization
  • Emergency on-call response
04

Disaster Recovery

Build mainframe-specific DR runbooks so your team knows exactly what to do when things go wrong.

  • Batch failure recovery procedures
  • JCL restart and rerun strategies
  • VSAM file recovery protocols
  • Escalation and contact procedures
05

Staff Augmentation

Need a legacy expert on your team — temporarily or long-term? We embed as your mainframe specialist.

  • On-site or remote engagement
  • Gap coverage during transitions
  • Peak period and audit support
  • Legacy-to-modern team liaison
06

Code Remediation

Fix broken, fragile, or undocumented code before it causes a production outage.

  • COBOL/JCL bug investigation and repair
  • Performance tuning for batch jobs
  • VSAM file restructuring
  • Y2K-style date and compliance fixes

Platforms & Technologies

We don’t just know these technologies — we’ve spent decades working inside them on production systems for DoD, federal agencies, and Fortune 500 companies.

Core Mainframe

COBOL JCL VSAM CICS DB2 REXX ISPF TSO SPUFI CLIST BMC Tools

Hardware & OS

z/OS MVS VSE IBM 3090 IBM z-Series UNIX Windows Server

Databases & Middleware

DB2 VSAM IMS Oracle SQL ODBC WebLogic Tuxedo

Security & Compliance

CISSP STIG Hardening CERT Management DoD Cybersecurity SSL/TLS IDS/IPS

Real Experience. Real Systems.

We Speak Mainframe

Our expertise wasn’t learned in a classroom. It was built across 40+ years on real production systems for the Army, Navy, federal agencies, and Fortune 500 companies.

🎖️

Military Discipline

30 years of active military service informs everything we do. When we say we’ll have your system stable by Monday morning, we mean it.

🔒

No Hidden Agenda

We are not trying to sell you a migration. We stabilize what you have and give you honest advice — not a pitch for a $10M modernization project.

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Direct Access

You work directly with the expert — not a junior consultant reading a manual. When the system goes down, you get the person who knows it.

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Proven Track Record

We’ve delivered for CENTCOM, the Defense Health Agency, AT&T, GE, Ford, and Sallie Mae. Your system is in experienced hands.

VOSB Certified

Veteran Owned Small Business. Eligible for federal set-aside contracts. Committed to the same mission focus that defined our military service.

Don’t Wait ForA Production Crisis.

The best time to call a legacy systems expert is before something breaks. Let’s assess your environment, identify the risks, and build a plan to keep your systems running reliably.

© 2025 Stop Gap Software Solutions — All Rights Reserved. Serving Remotely & Metro DC Area (MD, VA)  |  (703) 772-6675