Legacy Modernisation
Replace the engine without stopping the car.
Strangler-pattern migrations that retire legacy systems one capability at a time — with a rollback available at every step.
- No big-bang cutover
- Rollback at every step
- Business runs throughout
What it is
The rewrite that never lands
Big-bang rewrites fail for a structural reason: the old system keeps changing while you rebuild it, so you are shooting at a moving target with a fixed budget.
We migrate incrementally instead. New capability goes into the new system, traffic moves across behind a facade, and the legacy footprint shrinks release by release. If a step goes wrong, you roll back one capability, not one year.
- Strangler facade in front of the legacy system
- Capability-by-capability migration
- Continuous business operation
- Measurable reduction in legacy surface
Big-bang cutovers
Across every modernisation we have run
Legacy footprint retired
Median in the first year
Capabilities
What modernisation involves
Estate assessment
What you have, what it costs, what depends on it, and which parts are genuinely worth keeping.
- Dependency mapping
- Cost of ownership
- Risk ranking
Migration architecture
The facade, the data-synchronisation strategy and the sequence that keeps risk low at each step.
- Strangler facade
- Data sync design
- Cutover sequencing
Data migration
Moving decades of data with reconciliation you can show an auditor, not a one-shot script and hope.
- Reconciliation
- Dual-write periods
- Backfill tooling
Re-platforming
Rehosting what can move as-is, so budget goes to the parts that genuinely need rebuilding.
- Containerisation
- Cloud migration
- Runtime upgrade
Decommissioning
The final, frequently skipped step: proving nothing depends on it and turning it off for good.
- Dependency proof
- Archive strategy
- Shutdown plan
Stack
Technologies we use here
Sectors
Industries we deliver this in
Also relevant
Related services
FAQ
Questions we are asked
The programme takes years; the first measurable reduction in legacy load takes months. We sequence so that value lands early — if the first twelve months produce nothing switch-off-able, the plan is wrong.
Get an honest read on your estate
Four weeks, and you will know what to keep, what to rebuild and what to switch off.