Legacy systems are not legacy because they are old. They are legacy because changing them is frightening. No tests, no documentation, dependencies years out of support, and the person who understood it left in 2021. The system still runs the business, which is exactly why the full rewrite everyone suggests is usually the wrong answer.

Who this is for

Companies dependent on a system nobody wants to modify. Businesses on frameworks or language versions no longer receiving security updates. Teams whose delivery speed has fallen to near zero because every change risks a regression.

Problems we solve

Unsupported dependencies. Framework and language versions no longer receiving security patches.
No test coverage. No safety net, so every change is a gamble and velocity collapses.
Lost knowledge. Behaviour that exists only in code nobody has read.
The rewrite trap. An eighteen-month parallel build that never quite reaches parity.
Undocumented business rules. Logic embedded in code that nobody can restate as a requirement.

What we build

Assessment: architecture, dependencies, security exposure, test coverage and risk, in writing
Characterisation tests that pin current behaviour before anything changes
Incremental migration, routing traffic module by module rather than in one cutover
Dependency and framework upgrades taken in safe, tested steps
Extraction of business rules into documented, tested form
Containerisation and CI/CD, so deployment stops being manual
Monitoring, so the modernised system's behaviour is observable

How we work

We characterise before we change. Tests that capture what the system currently does — including the behaviour that looks like a bug but that something downstream depends on — are what make modernisation safe. Migration is incremental, with old and new running side by side and traffic moved gradually, so there is always a way back. Big-bang rewrites fail often enough that we will argue against one unless the system is genuinely beyond incremental repair.

Technologies we use

Migration targets in Laravel, Node.js, Next.js and React, on PostgreSQL or MySQL with Redis. Docker for containerising systems that were never packaged. GitHub Actions for CI. AI-assisted analysis to accelerate reading and documenting large unfamiliar codebases, with every conclusion verified against the code.

Business benefits

Security exposure from unsupported dependencies closed
Changes become safe, so the system can improve again
Business rules documented rather than trapped in code
Incremental delivery means value arrives throughout, not at the end
A rollback path at every stage rather than a single high-risk cutover

Where it pays off

Upgrading off an unsupported framework or language version
Adding test coverage to a system that has none
Moving from manual deployment onto a pipeline
Extracting a critical module from a monolith
Taking over a system whose original developers are gone

Common questions

Should we rewrite or modernise?

Modernise, in most cases. Rewrites lose undocumented behaviour, take longer than estimated, and run for months delivering nothing. We recommend a rewrite only when the existing architecture genuinely cannot support what you need next, and we will explain why in writing.

Can you work on it without the original developers?

Yes — that is the usual situation. We start by reading the code and writing characterisation tests, which establishes actual behaviour more reliably than a handover conversation would anyway.

Will the system keep running during this?

Yes. Incremental migration means the current system stays live while modules move across one at a time.

Have a system nobody dares change? The assessment is a useful deliverable on its own.

Software Modernization