Legacy Modernization

Legacy Application Modernization

Move aging applications onto modern .NET, modern front ends and the cloud — incrementally, while the existing system keeps running and your business keeps operating.

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  • .NET Framework → .NET 10
  • WebForms
  • WCF
  • ASP.NET MVC
  • ASP.NET Core
  • Azure
  • Docker
Server racks full of network cabling

What we modernize

  • .NET Framework to modern .NET

    Migrate class libraries, services and web apps to .NET 8, .NET 9 or .NET 10.

  • WebForms & MVC to ASP.NET Core

    Rebuild UI layers on ASP.NET Core, React or Next.js while preserving business logic.

  • WCF & SOAP to REST

    Replace legacy service layers with documented ASP.NET Core APIs.

  • On-premises to cloud

    Containerize and move workloads to Azure or AWS with CI/CD pipelines.

  • Database modernization

    Stored-procedure heavy systems refactored gradually; schema clean-up and upgrades.

  • Legacy mobile apps

    Replace separate native apps with a single Flutter codebase.

Incremental modernization, not a big-bang rewrite

We use the "strangler fig" approach: new components are built around the legacy system and gradually take over its responsibilities. Traffic moves route by route, each step is reversible, and the old system is retired only when nothing depends on it.

  1. Assess

    Inventory code, dependencies, data and risks.

  2. Stabilize

    Add tests and monitoring around critical paths.

  3. Replace

    Move functionality to modern components in stages.

  4. Retire

    Decommission legacy parts once unused.

Strangler fig pattern: a routing layer sends some requests to the new ASP.NET Core services and the rest to the legacy application, until the legacy application can be retired Users & clients Routing layergateway · reverse proxy New services.NET 10 · ASP.NET Coregrowing ↑ Legacy application.NET Framework · WebFormsshrinking ↓
The strangler fig pattern lets new and legacy components run side by side during migration.

From the blog

Guides on Legacy Modernization

Frequently asked questions

Should we rewrite or migrate incrementally?

In most cases incremental migration is safer. A full rewrite freezes feature work and risks losing undocumented business rules. We prefer to replace parts of the system step by step while it stays in production.

Can you migrate .NET Framework applications to .NET 8, 9 or 10?

Yes. We assess dependencies and incompatible APIs, upgrade libraries, replace WebForms or WCF components where needed, and migrate project by project with tests around critical behavior.

Can the legacy app get a mobile app or new API?

Yes. A common first step is to expose a modern API alongside the legacy system, which then supports new web front ends or Flutter mobile apps.

Planning a modernization?

Start with an assessment. We will map what you have, the risks, and a staged path forward.

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