Map the current state honestly
Including the undocumented behaviour everyone relies on. That is usually where migrations come unstuck, and it is cheapest to find early.
Off the spreadsheets, without stopping the business.
Transformation projects fail in a recognisable way: a long build, a big-bang launch, and two systems still running a year later because nobody dared turn the first one off. We work in stages, prove each one on your real data, and treat decommissioning the old system as part of the job rather than an afterthought.
Is this you?
You probably need this if…
- A system nobody wants to touch because the person who built it left
- Software running on a version that no longer receives security updates
- A previous migration that stalled, leaving two systems in use
- Growth blocked by a system that can't handle another entity or currency
- Knowledge about how it works living in one person's head
What we do
How we approach it.
Migrate in stages you can trade through
One area at a time, with a defined rollback. No weekend where the whole company holds its breath.
Run old and new in parallel
Both systems process the same work until the numbers agree on your data. Proof, not assurance, is what justifies the switch.
Actually decommission
The old system gets archived and switched off, with data retained to your retention policy. A migration that leaves two systems running has not finished.
Scope
What this covers.
- Current-state mapping
- Phased migration
- Data migration & cleansing
- Replatforming
- Parallel running
- Decommissioning
Why take our word for it
We rebuilt an entire product backend on a better foundation and retired the old one completely — no half-finished transition quietly running two systems.
What you get
Concretely, what lands in your hands.
- Current-state map including undocumented behaviour
- A staged migration plan with rollback at each step
- Data migration scripts and reconciliation reports
- Parallel-run results proving the numbers agree
- The new system, live
- Decommissioning and archival of the old one
How to buy
How this is usually engaged.
1–2 weeks · fixed fee
Discovery sprint
We sit with the people who do the work and write down how your business actually runs — the entities, the approvals, the exceptions — then scope and estimate the build against it.
Defined outcome · staged payments
Fixed-scope project
A written scope, milestones you pay against, and working software in your hands early. Ninety days of defect warranty from go-live, measured against the scope we agreed.
Ongoing · agreed response times
Managed & AMC
We operate and improve what's live: monitoring, patching, enhancements, and agreed response times for when something breaks. Business hours, with extended cover available.
FAQ
Questions we hear about this.
Can we keep operating during the migration?
That's the point of staging it. Each stage is small enough to roll back, and we don't switch anything off until its replacement has been proven against your own data in parallel.
Our data is messy. Is that a problem?
It's normal, and it's better to find out during mapping than during cutover. Cleansing and de-duplication are part of the migration work, and we report what we found rather than quietly guessing.
What if we start and then want to stop?
Because the work is staged, stopping leaves you with completed stages that stand on their own rather than a half-built system. You keep everything produced to that point.
Talk to us about digital transformation & legacy modernisation.
Describe what you run today and what isn't working. We'll come back with an honest view of what we would build, and what we wouldn't.