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.NET Framework modernization

From .NET Framework
to modern .NET.

The .NET Framework app that has served the business for a decade still works — but it is pinned to an old runtime, tied to the server it sits on, and harder to change every release. We move it to modern .NET and the cloud one slice at a time, parity proven before any cutover.

Book a discovery call How the slice loop works →
The stack

Modern in its day, dated by the runtime.

A .NET Framework estate is rarely failing — it is constrained. WebForms ties the UI to a server-side page lifecycle and view state that no current front-end developer wants to maintain. WCF and ASMX services speak protocols the rest of the industry has moved past, and they assume the always-on Windows server they were deployed to. The Framework itself is in long-term support, not active development, so the newest language features, performance work, and cross-platform support land in modern .NET only. The result is an application that runs fine on-premises and quietly resists every attempt to put it in a container, run it on Linux, or scale it horizontally in the cloud.

What modern looks like

Modern .NET, built for ten more years.

The target is concrete: modern .NET on a current LTS release, with WCF and ASMX re-expressed as REST and gRPC and the app hosted cloud-native instead of pinned to one Windows server. We keep the platform move separate from the architecture decision — you can land on the supported runtime first and refactor toward services on your own timeline, in any cloud, including regulated and air-gapped environments.

WebForms to a modern SPA
The server-rendered page lifecycle gives way to a modern single-page frontend over a clean API — no more view state, postbacks, or UI logic trapped in code-behind.
WCF and ASMX to modern services
Legacy SOAP endpoints are re-expressed as modern .NET services with current protocols, so integrations stop depending on a retiring stack.
On-prem to cloud-native
The app becomes containerized and cloud-portable, observable by default and able to scale horizontally instead of vertically on one server.
On the supported runtime
Running on modern .NET puts you back on the actively developed runtime, with the performance, security, and language work that no longer reaches the Framework.
How we do it

The slice loop, applied to .NET.

A slice is a single behavior — one page, one service endpoint. Each is analyzed, rebuilt on modern .NET, validated in shadow against the Framework app, and promoted only on parity. A strangler facade shifts traffic gradually; the legacy app retires last.

01
Analyze
AI deep-reads the solution — WebForms pages and their code-behind, WCF and ASMX services, the data layer, and the framework dependencies pinning you to an old runtime — captured as a living spec. The pass runs 10× faster than manual review: typically 12 weeks down to 2.
02
Transform
One behavior at a time — a single page, a single service endpoint — is rebuilt on modern .NET. Scope stays small enough to reason about end to end.
03
Validate
The new slice runs against the .NET Framework app under shadow traffic until behavior, data integrity, and the edge cases match. The parity gate stands between every slice and production.
04
Cut over
A facade in front of the legacy app shifts traffic gradually. Diverge, and it rolls back. The Framework endpoint is decommissioned only once the modern slice is proven.
Where the advice stops
Slice-by-slice depends on being able to isolate a behavior and observe it in production. Some .NET patterns resist that cleanly: WebForms screens whose logic is welded to the postback and ViewState lifecycle, in-process session state that every page assumes, or WCF duplex and callback contracts that don't map onto a stateless modern service. We name those hard cases in Discovery rather than after kickoff — and where a straight runtime re-platform is the right first move before any decomposition, we will tell you. Read the full approach →