Legacy .NET Developer Services

Maintenance, Security & Modernisation for ASP.NET Web Forms Applications

We specialise in supporting, stabilising and modernising legacy .NET applications without disrupting your organisation.

Get in touch with a .NET specialist today

Do You Still Run ASP.NET Web Forms or .NET Framework?

Many organisations still rely on long standing .NET Framework systems built using ASP.NET Web Forms or older MVC versions. These platforms often run core business processes, internal tools, booking systems, CRMs, and customer portals.

They work. They generate revenue. Replacing them outright can feel risky and expensive.

If your system was built between 2008 and 2018, there is a strong chance it runs on:

  • ASP.NET Web Forms

  • .NET Framework 4.x

  • MVC 4 or MVC 5

  • WCF services

  • Classic Entity Framework

These systems are still widely used across the UK in:

  • Local authorities

  • Membership organisations

  • Education providers

  • Logistics and manufacturing firms

  • Professional services businesses

Often the original developer has moved on. Internal teams now focus on modern stacks. The legacy platform becomes harder to maintain over time.

That is where a specialist legacy .NET developer becomes valuable.

What We Do

 

1. Ongoing Maintenance & Support

We provide structured support for existing .NET Framework applications, including:

  • Bug fixing and issue resolution

  • Performance improvements

  • Code refactoring to reduce technical debt

  • Documentation and knowledge transfer

  • SLA based support if required

We stabilise ageing systems so they remain reliable and predictable.

2. Security Reviews & Server Upgrades

Older applications can become vulnerable if not maintained properly.

We carry out:

  • Security audits of legacy .NET applications

  • Dependency reviews

  • IIS and Windows Server configuration updates

  • SSL and certificate management

  • Patch planning

Our focus is keeping your system compliant and secure without unnecessary disruption.

3. UI Restyling & Front End Modernisation

Many Web Forms applications still function well, but the interface feels dated.

We can reskin and restyle legacy applications to improve user experience without rebuilding the core system.

This can include:

  • Responsive layout updates

  • Modern CSS frameworks

  • Accessibility improvements

  • Improved navigation and content structure

  • Visual refresh to align with your current branding

Often this delivers a significant improvement in usability at a fraction of the cost of a full rebuild.

4. Phased Modernisation & Migration Planning

Not every organisation is ready for a complete rewrite to .NET 8 or a new platform.

We help you move forward in controlled stages:

  • Extracting business logic into APIs

  • Separating data access layers

  • Replacing individual modules over time

  • Migrating from Web Forms to MVC gradually

  • Creating a clear, realistic roadmap

This reduces risk and spreads investment over manageable phases.

Why Legacy .NET Still Matters

Strategically, many companies aim to modernise. In practice, business critical systems cannot simply be switched off.

Bespoke .NET Framework platforms often:

  • Integrate deeply with accounting or CRM systems

  • Contain years of operational logic

  • Support internal processes that are hard to replicate

  • Generate consistent revenue

Maintaining and evolving them safely is often the most sensible commercial decision.

Who We Typically Work With

We support organisations that:

  • Have a bespoke ASP.NET Web Forms application

  • Need a reliable partner to maintain legacy systems

  • Are unsure whether to rebuild or modernise

  • Have lost their original developer

  • Require better UI and accessibility without replacing the backend

Looking for a Legacy .NET Developer in the UK?

If your organisation relies on a .NET Framework application and needs experienced support, we can help.

Whether you require ongoing maintenance, a security review, a visual refresh, or a long term modernisation strategy, we provide pragmatic advice grounded in real world experience.

Get in touch to discuss your current system and your future plans.

Get in touch with a .NET specialist today