Simplex Method Ltd.

Legacy .NET systems modernized safely and efficiently.

We upgrade VB.NET, C#, classic ASP, and desktop apps to modern .NET with minimal downtime. Desktop, web, and cross-platform UI with Avalonia.

Request a system review Our services
  • NDA friendly
  • EU/GDPR compliant
  • 25 years of experience

Deep Microsoft stack expertise

VB.NET, C#, .NET Framework to .NET 10, classic ASP, ASP.NET Core, SQL Server.

Desktop and cross-platform UI

Modernize WPF/WinForms and build cross-platform apps with Avalonia UI.

Low-risk modernization

Pilots, rollbacks, CI/CD, and careful cutovers keep operations running.

What we do

Legacy modernization and migration

Migrate VB.NET to C#, upgrade .NET Framework apps, refactor monoliths, and improve performance.

Desktop and cross-platform UI

WPF/WinForms upgrades and Avalonia UI for Windows, Linux, and macOS.

Web development and upgrades

ASP.NET Core services and classic ASP migration paths to modern .NET.

Maintenance and support

On-demand or retainer, incident response, monitoring, and small enhancements.

A simple, reliable process

  1. 1

    Discover

    Short call to understand goals, constraints, and timelines.

  2. 2

    Audit

    Review code, dependencies, deployment, and risks.

  3. 3

    Roadmap

    Clear plan with milestones, pilots, and rollback strategy.

  4. 4

    Pilot

    Validate approach on a safe slice of the system.

  5. 5

    Rollout and support

    Careful deployment, documentation, and ongoing support.