Legacy modernization

Modernize the system without breaking the behavior that runs the business.

The safest modernization plan starts with the behavior already in production: screens, workflows, SQL rules, reports, edge cases, permissions, integrations, and the business exceptions no one wrote down.

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Good fit

ASP.NET, Web Forms, Classic ASP, VB.NET, C#, or SQL-heavy systems.
High fear of regressions during rewrite or framework migration.
Undocumented business rules embedded in code, stored procedures, or screens.
Need for seams, parity checks, generated scenarios, and safer delivery increments.

Modernization posture

Do not start by rewriting everything. Start by preserving observable behavior, isolating risk, adding testable seams, and creating a roadmap that lets the team improve structure without betting production on guesswork.

The main Long Term Software site expands this into diagnostic packages, process, and case-study evidence.