Approach
Improving an existing .NET codebase
Many valuable business applications become harder to change over time. The problem is rarely one bad decision. More often, maintainability is reduced by many small design compromises, unclear boundaries, infrastructure leakage, hidden coupling, and tests that no longer explain the behavior they protect.
My usual approach is not to recommend a rewrite. It is to understand the system, identify where change is most expensive, and find practical improvements that can be made safely while the application continues to serve the business.
The kind of situation this fits
This type of review is useful when a .NET system still has business value, but everyday development has become slower, riskier, or harder to reason about.
- New features require changes in too many places.
- Small changes often create unexpected side effects.
- Business logic is mixed with UI, database, framework, or integration details.
- Tests exist, but they are brittle, unclear, or too coupled to implementation details.
- The team is unsure whether to refactor, rewrite, or simply live with the current structure.
How I would approach it
I start by looking for the parts of the system where design friction has a real cost. The goal is not to find every imperfection. The goal is to find the places where better structure would make future change safer and more predictable.
- Clarify which parts of the application change most often, and why those changes are difficult.
- Review responsibility placement: where decisions are made, where rules live, and where infrastructure details have leaked into application code.
- Look for boundaries that exist in project structure but not in the actual dependencies.
- Examine tests to see whether they explain behavior, hide design problems, or make refactoring harder.
- Identify small, safe refactorings that reduce risk without interrupting normal delivery.
Typical recommendations
The result is usually a prioritized set of concrete improvements rather than a large architecture diagram detached from the code.
- Move framework and infrastructure details closer to the edges of the application.
- Make business decisions explicit in application or domain code.
- Reduce convenience dependencies that make unrelated code change together.
- Strengthen tests around behavior before larger refactorings.
- Introduce smaller interfaces only where they make collaboration or substitution clearer.
- Improve naming so code reveals intent rather than only implementation activity.
What the team should get from it
A useful review should leave the team with a clearer sense of what to improve first, why it matters, and how to make progress without turning maintainability work into a separate, open-ended project.
- A short explanation of the main maintainability risks.
- A prioritized list of practical improvements.
- Examples connected to the actual codebase or architecture.
- Suggestions for incremental refactoring steps.
- A distinction between urgent risks and improvements that can wait.
Need help assessing an existing .NET codebase?
I can help review maintainability risks, architecture boundaries, and practical options for improving an existing system without unnecessary rewrites.