.NET Modernization Services: Upgrade Legacy Apps to Modern .NET
Our .NET modernization services help you move aging .NET Framework, ASP.NET Web Forms, and legacy Windows applications to modern .NET without disrupting the business. We assess what you have, choose the right migration path, and deliver a secure, cloud-ready application that your team can maintain and extend.
If your software is slow to change, costly to host, hard to secure, or dependent on developers who know only the old code, modernization is usually cheaper than continuing to patch it. We plan each project so critical systems stay online while the upgrade happens in stages.
- Phased, low-risk migration
- Clear scope and cost ranges
- Cloud-ready architecture
- Security-first delivery
What Are .NET Modernization Services?
.NET modernization is the process of upgrading an existing application to a current, supported version of .NET, and often to a better architecture and hosting model at the same time. Depending on your goals, that can mean a simple framework upgrade, a move to the cloud, breaking a monolith into services, or a full rebuild of the parts that no longer fit.
Modern .NET, including .NET 10 (a Long-Term Support release), is faster, runs on Windows, Linux, and containers, and receives regular security updates. Check exact dates on the official .NET support policy page.
Signs You Need .NET Modernization Services
- It runs on an old .NET Framework version, VB6, or ASP.NET Web Forms
- Releases are slow, risky, and need long testing cycles
- Hosting is tied to expensive Windows servers or on-premise hardware
- Security patches and dependency upgrades are hard to apply
- Performance drops as users or data grow
- Few developers can safely change the code
- Integrating with modern APIs, mobile apps, or AI is difficult
If you recognize three or more of these, a modernization assessment is a good next step. You can also read our guide on legacy system modernization and when to migrate to .NET Core.
Our .NET Modernization Services
.NET Framework to .NET 10 Migration
We upgrade .NET Framework apps to modern .NET, handling breaking changes, unsupported libraries, and testing. We use Microsoft's .NET Upgrade Assistant where it helps.
ASP.NET Web Forms and MVC Modernization
Web Forms has no direct path forward, so we plan a staged move to ASP.NET Core, Razor Pages, MVC, or Blazor. See our ASP.NET MVC services or hire a Web Forms developer.
VB6 and Legacy Desktop Migration
We move VB6 and older desktop applications to modern .NET. Learn more about our VB6 to .NET Core migration.
Monolith to Microservices
We break large systems into smaller, independently deployable services, starting with the parts that change most or need to scale. This lowers risk compared with a full rewrite.
Cloud Migration and Azure Modernization
We containerize applications and move them to Azure, AWS, or Google Cloud with CI/CD, monitoring, and cost controls. See our Azure cloud-native .NET services.
API Layer and Integration
We wrap legacy logic with secure APIs so new web, mobile, and partner systems can connect without a full rewrite. Explore our .NET API development services.
Database and Performance Modernization
We upgrade data access to Entity Framework Core, tune slow queries, and move databases to managed cloud services when it makes sense.
Choosing the Right Modernization Approach
There is no single best path. Every one of our .NET modernization services starts by choosing an approach based on business value, risk, and budget:
Rehost
Move the app to cloud infrastructure with minimal code change.
Best when: You need to exit a data center quickly.
Replatform
Upgrade the framework and make small improvements.
Best when: The code is healthy but the platform is old.
Refactor
Clean up and restructure code while keeping behavior.
Best when: Technical debt is slowing every release.
Rearchitect
Move to services, APIs, or cloud-native design.
Best when: You need scale, resilience, or faster delivery.
Rebuild
Rewrite on a modern stack.
Best when: The old system cannot be saved economically.
Replace
Swap in a commercial product.
Best when: A standard product covers the need.
Our .NET Modernization Process
- 1. Discovery and Assessment : We review your code, dependencies, infrastructure, security, and business goals, then rate each component for risk and value.
- 2. Roadmap and Estimate : You receive a prioritized plan, an architecture proposal, timelines, and cost ranges before any major work begins.
- 3. Proof of Concept : We migrate one representative module to confirm the approach and surface hidden problems early.
- 4. Incremental Migration : We modernize in phases, keeping the existing system running and releasing frequently.
- 5. Testing and Security Review : Automated tests, performance testing, and dependency and security checks protect behavior and data.
- 6. Deployment and Handover : We deploy with CI/CD, document the system, and train your team.
- 7. Support and Optimization : We offer ongoing maintenance, monitoring, and improvements after launch.
Technologies We Work With
Benefits of .NET Modernization Services
Moving to modern .NET pays off in several practical ways:
Better Performance
Modern .NET is one of the faster mainstream web platforms and uses fewer resources.
Lower Hosting Costs
Run on Linux and containers instead of costly Windows-only servers.
Stronger Security
Supported runtimes receive regular patches, and modern authentication is easier to adopt.
Faster Releases
Automated pipelines and cleaner architecture shorten delivery cycles.
Easier Hiring
Developers prefer modern .NET over legacy frameworks.
Ready for AI and Integration
Modern APIs and cloud services make new features simpler to add.
Who We Help
We modernize business-critical applications for healthcare, finance and insurance, logistics, manufacturing, retail, education, and government organizations. Typical projects include internal portals, ERP and CRM systems, customer-facing web apps, and reporting platforms. See our portfolio for examples of our work.
Why Choose Us for .NET Modernization Services
Staged, Low-Risk Plans
Migration plans that keep critical systems running while we modernize.
Clear Scope and Pricing
Defined scope, timelines, and cost ranges before work begins.
Flexible Engagement
Fixed scope, dedicated team, or hourly. You can also hire dedicated .NET developers.
.NET Modernization Services Cost and Timeline
Cost depends on application size, code quality, test coverage, the target architecture, and how many integrations are involved. A small application may take weeks, while a large enterprise system is usually delivered in phases over several months. We provide a fixed-range estimate after the assessment. For pricing context, read our guide to .NET development cost in the USA.
Frequently Asked Questions
Start Your .NET Modernization Project
Not sure where to begin? Our architects can review your application and recommend a safe, cost-effective path with our .NET modernization services.
Talk to us about Microsoft .NET consulting services or explore our enterprise .NET application development services.
Related reading: ASP.NET Core development guide and ASP.NET Core vs Node.js for enterprises.
