Moving to modern .NET can help, but the path is rarely a one-click conversion. Dependencies, APIs, hosting, data access, authentication, and user workflows all need review. In particular, older ASP.NET applications can require substantial manual work when moving to ASP.NET Core, as Microsoft’s migration guidance explains.
The companies below offer different types of .NET and application modernization support. This is a shortlist to consider, not a scored ranking. The right choice depends on your codebase, business constraints, and whether you need a focused migration or a larger cloud transformation.
What should a .NET modernization proposal include?
The first deliverable should be a clear inventory of projects, libraries, integrations, infrastructure, and unsupported dependencies. Ask the provider to identify which components can be upgraded directly, which need refactoring, and which may need to remain on .NET Framework for now.
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