What This Is
Legacy software support is maintaining a system that your business depends on but that no one wants to rebuild — keeping it running, fixing bugs, applying security patches, and making careful changes without introducing instability. This is the work of keeping old software alive, not modernising it. If you want to replace the system, that is legacy modernisation. If you just need it to keep working, this is the right service.
Every business reaches a point where a critical system is old enough that the original developer is gone, the documentation is sparse, and the technology is unfashionable. But the system works. It processes orders, tracks inventory, manages clients, or handles some essential workflow that the business cannot operate without. Replacing it would be expensive and risky. So it needs to be maintained — carefully, by someone who understands the risks of changing code that no one fully understands.
This is unglamorous work, and most agencies avoid it because it is not billable at premium rates and it requires patience rather than speed. We do it because we understand that the system you have is often more valuable than the system you wish you had, and keeping it running reliably is a legitimate engineering outcome.
When You Need This
Legacy software support is the right service when:
- Your system works well enough and a rebuild is not justified — but it needs ongoing bug fixes, security patches, and occasional small changes
- The original developer is no longer available and you need someone who can take over a codebase they did not write
- The system runs on an older technology stack that your current team does not have experience with
- You need security patches applied to an application that uses outdated dependencies or frameworks with known vulnerabilities
- Small feature requests come up occasionally — not enough to justify a new project, but enough to need a developer who knows the system
- You have a compliance or regulatory requirement to maintain and patch the system even though it is end-of-life in your roadmap
This is not the right service if the system is fundamentally broken, architecturally unsound, or causing more problems than it solves. If maintaining the system costs more than replacing it, legacy modernisation or custom software development is the better path. We will be honest about when maintenance stops being worth the investment.
How We Work
Taking over a legacy system starts with understanding what we are working with — a codebase audit that maps the architecture, identifies the risks, and establishes what can be safely changed and what should not be touched without significant testing.
We learn the system before changing it. The first engagement with a legacy codebase is read-only: we trace the data flows, identify the dependencies, map the deployment process, and understand the test coverage (or lack of it). This audit takes one to two weeks depending on the system’s size and produces a risk map that guides all future changes.
Changes are small, tested, and reversible. Legacy systems are fragile precisely because they are not well understood. We make changes in small, isolated increments with rollback plans. Bug fixes are verified against the specific scenario that caused them. Feature additions are scoped to minimise the surface area of change.
We add safety nets as we go. When we work in an area of the codebase, we add tests for the behaviour we are touching — not to achieve coverage targets, but to give ourselves (and you) confidence that future changes will not break what we just fixed. Over time, the most frequently modified areas of the system become the most tested.
What You Get
- Codebase audit documenting the system architecture, technology stack, risk areas, and deployment process
- Bug fixes investigated, tested, and deployed without introducing new issues
- Security patches for frameworks, libraries, and dependencies with known vulnerabilities
- Small feature additions implemented carefully within the existing architecture
- Dependency updates where possible — keeping libraries current within the constraints of the legacy stack
- Documentation of the system as we learn it — the tribal knowledge that was never written down
- Monitoring recommendations for early detection of problems in ageing infrastructure
- Honest assessment of when maintaining the system is no longer the right investment
Technologies We Use
Legacy support is technology-agnostic by necessity. We work with whatever the system was built in. Our core competencies cover:
- PHP (including older versions and frameworks — CodeIgniter, CakePHP, plain PHP)
- WordPress legacy sites and plugins
- MySQL / PostgreSQL database maintenance and optimisation
- JavaScript (jQuery-era codebases through to modern frameworks)
- Python legacy scripts and services
For technologies outside our direct experience, we assess during the audit phase and are transparent about whether we can support the system effectively.
Related Systems
Legacy systems often need to integrate with modern systems we build. A legacy order processing system might need to feed data into a new reporting dashboard. A legacy client database might need to connect to a new client portal. We build these integrations carefully, respecting the legacy system’s limitations while extending its useful life.
Talk to Us About Your Legacy System
If you have a system that needs to keep running and no one to maintain it, get in touch and we will assess the codebase and tell you honestly what it will take to support it — and whether you should.
