If you already know you want to modernise a legacy system, go straight to our legacy modernisation service. It covers how we stabilise the system, connect it to modern tools and move functions out in stages, with what you get at each step. This section is for the stage before that: working out what state the system is in, what it is costing you, and which option fits.
The Real Cost of Keeping Systems You Have Outgrown
Every business running a legacy system knows the feeling. The system works, mostly. It does what it was built to do. But it cannot integrate with the tools you adopted last year, it cannot produce the reports your board now asks for, and it struggles with the volume you process today. The developer who built it left three years ago and took the only working knowledge of the codebase with them.
The cost of a legacy system is rarely the bill for keeping it running. It is the list of things you cannot do because of it: the integration you cannot build because the system has no API, the process you cannot automate because the data sits in an Access database, the new hire who needs weeks to learn a system designed for a team of four. These costs do not show on a balance sheet, and they compound every month the system stays as it is.
We work with legacy systems every week because businesses cannot switch off the software they depend on. That has meant bespoke tools on outdated PHP frameworks, Access databases running critical workflows, spreadsheets that became the operational backbone of a growing company, and custom software with an unreachable author and no documentation. The pattern repeats. The system served the business well when it was built, then the business changed and the system did not.
Start With Your Situation
Pick the page that matches what you are dealing with.
- Old PHP systems. PHP 5.x and 7.x codebases with no framework, and what it takes to bring them up to date a piece at a time.
- Access databases. Microsoft Access running as a production database, and how to move it to a proper platform without losing data or logic.
- Classic ASP. Sites still running on IIS that nobody wants to touch, and how to migrate them without breaking the workflows around them.
- Old inventory systems. Desktop stock systems that cannot talk to your shop or your suppliers.
- Legacy API bridges. Connecting an old system to modern platforms through a middleware layer, without rewriting the original.
Decide Before You Commit
Most legacy projects go wrong at the decision stage, so these are worth reading first. How to Assess If Your Legacy System Needs Replacing helps you judge the system’s condition. How to Decide When to Modernise vs Maintain covers the choice once you know it. If you have decided to replace, How to Plan a Legacy System Replacement sets out the project. The replace or keep comparison lists the questions that settle it.
How We Approach Legacy Work
We do not push a rewrite unless the existing system is beyond saving. Usually we build alongside what is there. An API bridge lets the old system talk to modern platforms. Replacing components one at a time means the business never stops operating. Data moves out of formats that cannot scale into structures that can.
We have watched replacement projects fail because they tried to rebuild everything at once. They lost months to scope creep and ended up with a half-finished new system and a decaying old one. Staged work costs less, delivers sooner, and lets you check each step before paying for the next.
If the new system will be custom software, the Systems section describes the types we build most often.
Ready to Talk About Your System?
Send us what you have and we will tell you what we would do with it. Sometimes that is an API bridge, sometimes a phased rebuild, and sometimes it is to leave the system alone for now. The conversation is free. The legacy modernisation service page explains how an engagement runs, or you can get in touch directly.
