Enterprise Platform Engineering
Retire the legacy without stopping the business
Escape aging systems without betting the business on a big-bang rewrite.
The system is fifteen years old, its author has left, the vendor is gone, and every change is a risk negotiation — but it runs the business, so nobody dares touch it. Big-bang rewrites fail publicly and expensively. There's a safer route.
- Zero big-bang risk — every step reversible
- Change requests measured in days again
- Institutional knowledge captured before it walks out the door
Capabilities
What the work actually involves
Legacy assessment & mapping
What the old system actually does — documented from code, data, and the operators who know its secrets.
Choosing the approach, per system
Rehost, replatform, refactor, rearchitect, rebuild, replace or encapsulate — assessed against maintenance cost, regulatory exposure and how much the business would notice. Most estates need more than one answer.
Strangler-pattern migration
New platform grows around the old one, taking over capability by capability with reversible cutovers.
Data migration & reconciliation
Years of records moved with checksummed, parallel-run verification — history intact, auditors satisfied.
Interface preservation
Downstream systems and habits keep working while the engine changes beneath them.
Decommissioning discipline
The old system retires on evidence, with archives and fallbacks until confidence is total.
Deliverables
What you are handed.
Yours to keep, and written so another team could pick them up.
A dependency map of what actually exists
Including the jobs nobody remembers scheduling.
A strangler plan, sequenced by risk
What moves first, what moves last, and what is deliberately left alone.
Behaviour tests against the old system
So 'the new one does the same thing' is a demonstrated fact rather than a hope.
Parallel-run evidence
Both systems processing the same load, differences reconciled and explained before cutover.
We do not publish prices — scope drives them. Everything else, here.
- Starts with
- A discovery that produces the dependency map, whoever builds afterwards
- Typical duration
- 6–18 months, incremental throughout
- Who you get
- An architect, three to five engineers, a QA lead
- Commercial model
- Discovery fixed, then phased per strangled component
How to decide
What the answer depends on.
Two sets of conditions. Read both against your own situation — most organisations recognise themselves in one column within a sentence or two.
This is the right call when
- The system works but nobody will touch it, and the people who wrote it have gone.
- A big-bang rewrite has been proposed and you are rightly nervous.
- It must keep running throughout — there is no window to stop.
A different approach fits better when
- A big-bang rewrite is already decided and not open to challenge.
- The old system can simply be switched off — that is a build, not a modernisation.
- No access to production behaviour or data for characterisation.
Before you ask
Questions about legacy modernization
Sectors
Where this comes up most.
The regulatory context and the systems already in the building change the build. Each sector page says how.
More in Enterprise Platform Engineering
Next step
Bring us the problem. We will bring the architecture.
A discovery call takes forty-five minutes. You leave with our read on the problem, the shape of the system we would propose, and a straight answer on whether we are the right team for it.
- No sales deck
- An engineer on the call, not an account manager
- NDA before you share anything