Legacy Software Diagnostics
Understand old software before you rewrite, replace, recruit for or retire it.
Redfield Diagnostics helps businesses make sense of fragile legacy code, old stacks and long-lived internal systems before a risky change becomes an expensive mistake.
For old code nobody wants to touch.
Legacy software is not just "old tech." It is often business logic, operational history and undocumented decisions packed into code that still matters. The risk is not age by itself. The risk is not knowing what will break when someone makes the next change.
Redfield is built for that kind of diagnostic work: reading difficult code, tracing behaviour, identifying fragile dependencies, explaining what is safe to change, and mapping the options before you commit to a rewrite, replacement, recruitment decision or retirement plan.
Relevant stacks and situations
- VB6, Delphi, Classic ASP, old .NET Framework, WinForms, C/C++.
- Old internal tools with thin documentation.
- Systems where the original developer has left.
- Code that still runs but feels dangerous to change.
- Software you may need to repair, replace, recruit for or retire.
Diagnostic outputs
What the work produces.
Codebase map
What exists, where the important code paths are, and what the system depends on.
Risk register
The fragile areas, unknowns, single-person knowledge and "do not touch yet" warnings.
Next-step options
Practical recommendations for repair, containment, replacement, recruitment or retirement.
Why Redfield
Experience from low-level, long-lived software environments.
Redfield Diagnostics is founded by Dan Redfield, whose work includes leading development of a worldwide intranet platform for one of the world’s largest optical retail groups, commercially porting POSTAL to the SEGA Dreamcast, raw ASM reverse engineering, low-level debugging and technical archaeology.
That background is useful in legacy environments because older systems often require code reading, behavioural reconstruction, practical debugging and careful judgement rather than fashionable tooling.
Starting points
- Technical Risk Note: from £350.
- Inherited Codebase Diagnostic: from £950.
- Legacy Software Diagnostic: from £1,950.
Need to understand legacy software?
Describe the stack, age, business role, known risks and the decision you need to make.