Replace the system nobody dares to touch
Every company past a certain age has one: the system that runs everything and terrifies everyone. We modernise incrementally — strangler-pattern replacements, verified data migration and bridges that keep both worlds in sync — so the business never stops while the risk drains out of it.
What modernisation covers
From the honest audit to the day the old servers are finally switched off.
Technical audit & roadmap
What to keep, what to wrap, what to replace — an honest map of the system, priced phase by phase.
Strangler-pattern rebuilds
New modules take over one capability at a time behind a stable interface, with rollback at every step.
Data migration, verified
Reconciled totals, counts and spot checks between old and new — migration you can show an auditor.
Bridges & coexistence
APIs, file drops and event feeds that keep old and new consistent for as long as both must live.
How we de-risk a system replacement
Big-bang rewrites fail for structural reasons. This is the structure that doesn't.
Audit what exists
Code, data, integrations and the undocumented behaviour the business secretly depends on. The audit names what's worth keeping.
Wrap it in interfaces
A stable API layer around the legacy core — so new modules, integrations and tools stop depending on its internals.
Replace piece by piece
Each capability moves to the new system behind the same interface, runs in parallel, and cuts over only when the numbers match.
Decommission deliberately
The old system is switched off module by module — licences, servers and risk retired on a schedule, not a prayer.
What you hold at each phase
Every phase ends with something standalone — you can stop at any of them and be better off than you started.
Common questions
Can this really be done with zero downtime?
Phased cutovers with parallel runs mean the business keeps working throughout. Individual cutovers happen in maintenance windows measured in minutes — and every one has a tested rollback.
Rewrite or modernise — how do we decide?
The audit decides, honestly. Sometimes the answer is "keep the core, rebuild the edges"; occasionally a specific part deserves a rewrite. A big-bang full rewrite is almost never it, and we'll be the first to say so.
The system runs on technology nobody here knows anymore. Is that a problem?
It's the usual case. The wrap-first approach means we rarely need to change the old code at all — we contain it behind interfaces, and the new system grows in technology your future hires already know.
How long does modernisation take?
It's phased by design: the first capability typically moves within a quarter, and each phase delivers standalone value. You can stop after any phase and keep a system that's strictly better than where you started.
A company's complete AI workloads, migrated from cloud APIs to on-prem hardware
An ongoing migration with no interruption to daily operations — workload by workload, with rollback at every step.
Read the case study →More custom software
Operational platforms →
Order management, scheduling, dispatch, pricing — the system of record for your operation.
Customer-facing products →
Portals, marketplaces and SaaS products — from first release to real revenue.
Internal tools →
Admin panels, approval flows, dashboards and pricing engines your team actually adopts.
The full practice →
Everything we do in custom software.
How much is the old system really costing?
Licences, workarounds, risk and the projects it blocks — the audit puts a number on it.