Modernise Your Legacy Software Without Disruption

We specialise in upgrading old business-critical systems — like Access databases, VB6 apps, and other outdated tools — into fast, secure, and maintainable platforms using .NET and the latest AI development workflows.

What We Upgrade

We modernise all types of legacy business systems

Microsoft Access or Excel/VBA systems
VB6 and legacy .NET apps
Classic ASP or internal web portals
SQL Server databases with performance issues
Manual workflows reliant on outdated tools

Why Upgrade?

The benefits of modernising your legacy systems

Break Free from Tech Debt

Eliminate maintenance headaches and reduce operational risks

Boost Performance & Security

Modern platforms with enterprise-grade security and speed

Integrate with Modern Platforms

Connect seamlessly with cloud services and modern APIs

Future-Proof Your Operations

Built on modern frameworks that evolve with technology

Our Approach

A proven 4-step process for seamless legacy modernisation

1

Audit & Strategy

System review and risk analysis to plan the perfect upgrade path

2

Modern Design

UI/UX redesign and clean architecture for better user experience

3

AI-Accelerated Rebuild

Use GitHub Copilot, ChatGPT, and automated tests for rapid development

4

Test & Transition

Parallel testing and smooth handover with minimal downtime

Tools We Use

Modern technology stack for reliable, scalable solutions

.NET 8 & SQL Server

Enterprise-grade Microsoft technology stack

Azure or AWS

Scalable cloud hosting and services

AI Development Tools

GitHub Copilot, ChatGPT, OpenAI APIs

Modern Frontend

Blazor, React, Razor Pages

Why CoSource?

The expertise and approach that makes us the right choice for your legacy upgrade

30+ Years Microsoft Tech

Deep expertise in Microsoft technologies and legacy system migration

Transparent Agile Delivery

Clear communication and regular updates throughout your project

Trusted with Core Systems

Proven track record with business-critical internal systems

European/US Based

Local expertise with quick response times and timezone alignment

Still running on legacy software?

Let's upgrade it — safely, quickly, and without the headaches.