Government agencies at every level depend on systems that were built decades ago - AS/400s running COBOL, Informix databases behind citizen-facing services, DOS-based terminals in field offices, and middleware layers that no one fully understands anymore. The people who built them have retired. The platforms they run on are end-of-life. And the mandates to modernize are arriving faster than the capacity to execute.
Whitehorn Ltd. Co. modernizes these systems. As a principal-led firm with decades of experience modernizing legacy systems across government and enterprise, we bring senior technical leadership to every engagement - from initial assessment through migration and delivery.
What We Understand
The constraints that define government modernization
Government modernization is not the same as enterprise modernization. The procurement process is different. The compliance requirements are different. The tolerance for risk is different. And the consequences of failure are public.
Mandated Timelines
Modernization in government is often driven by legislative mandates, audit findings, or end-of-life vendor support windows - not discretionary roadmaps. We work within those constraints, not around them.
Compliance & Security
Change control, audit trails, data handling requirements, and security postures that private sector projects rarely face. We build modernization plans that satisfy compliance from day one, not as an afterthought.
Zero Tolerance for Downtime
When the system processes benefits, licenses, permits, or public safety data, "we'll cut over this weekend" is not an acceptable plan. We deliver modernization incrementally, with legacy and modern systems running in parallel until the transition is proven.
Institutional Knowledge Loss
The engineers who built these systems are gone. Documentation is incomplete or nonexistent. We start every engagement with a thorough legacy assessment - mapping what exists before deciding what to change.
The Legacy Landscape
The systems government agencies are still running
AS/400 & IBM i
RPG, CL, DB2/400, and green-screen applications still processing core agency workloads decades after deployment.
COBOL
Batch processing, mainframe transaction systems, and business logic buried in millions of lines of code that no one on staff can maintain.
DOS-Based Systems
Terminals, field office systems, and embedded platforms still running on DOS. As the owners of DR DOS®, we understand these systems at the source level.
Informix & Legacy Databases
Informix-4GL applications, legacy middleware, and database platforms that predate modern cloud infrastructure - still running, still critical.
Related Experience
The same problems, the same stakes, across industries
The challenges government agencies face - aging platforms at massive scale, zero tolerance for downtime, systems built by people who are no longer around - are the same challenges we've solved in energy, enterprise technology, and data-intensive organizations. Our case studies detail engagements including SCADA platform modernization with 10 billion rows of timeseries data, full application rewrites delivered incrementally with zero downtime, and real-time field data platforms with complex industry integrations.
The systems are different. The constraints are the same. See how our services apply →
Procurement
We're registered and ready to work
Whitehorn Ltd. Co. is registered on SAM.gov and holds active vendor registrations in multiple states. We're structured to work within government procurement frameworks including time-and-materials, firm-fixed-price, and task order contracts.
SAM.gov
UEI: ZBWFXX1Y8HJ1
CAGE: 1ZWF1
NAICS Codes
513210, 541511, 541512, 541519
State Registrations
Arkansas, California, Colorado, Massachusetts, Oklahoma, Virginia, Washington
Contract Types
Time & Materials, Firm-Fixed-Price, IDIQ Task Orders
Facing a modernization mandate? Let's talk about what the path forward looks like.
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