Legacy system integration and modernisation
We carry out legacy system modernisation one piece at a time, connecting your older software and ERPs so the business keeps running while the old system is gradually replaced. You can add modern tools and AI features now, while the longer modernisation continues in the background.
What it is and when it fits
Legacy modernisation starts by putting a clean API layer around the existing system, reading from its database, files or interfaces and exposing well-documented endpoints that new applications can use. From there we apply the strangler pattern: individual functions move to new services one at a time, traffic shifts over as each one proves itself, and the old system shrinks until it can be retired. Data stays consistent throughout, and every step can be rolled back.
This approach fits organisations whose core system still works but blocks change, where knowledge of the old code is thin, and where a failed rewrite would hurt operations badly. Sometimes the old system is stable and only needs an API so other tools can use its data, and we stop there. If a platform is small, well understood and near end of support, a planned replacement can be the simpler path.
What we build
API layer around legacy systems
Documented REST or GraphQL endpoints over old databases, file exchanges and proprietary interfaces, with authentication and rate limits.
Incremental service migration
Functions such as pricing, stock or customer records moved to new services one by one, with routing that shifts traffic gradually.
Data synchronisation
Two-way sync between old and new systems during migration, with conflict handling and reconciliation reports.
ERP extensions
New workflows and interfaces built next to SAP, Odoo or older ERPs, leaving the core untouched and upgrades unaffected.
System documentation and mapping
Data models, dependencies and business rules recovered from the existing system and written down before anything changes.
How it works
- 01
Assess the current system
We map the architecture, data, integrations and hidden business rules, and identify where change is most needed and least risky.
- 02
Build the integration layer
An API around the legacy system gives new tools safe access to its data and functions, with no changes to the core.
- 03
Migrate in slices
Functions move to new services one at a time, each running in parallel and verified against the old behaviour before switching.
- 04
Retire what is left
Once traffic has moved, we archive the data, decommission old components and hand over the new platform.
Built with
All technologiesFurther reading
API integrations explained, with examples
An API integration lets two systems exchange data without anyone re-typing it. How one works, examples from finance and operations, the ways to get one built, what can go wrong and what drives the cost.
10 min read
How to automate your business processes
How to automate business processes one at a time: pick a repetitive process, measure it, decide between rules and AI for each step, and run it alongside your team before it takes over.
10 min read
Common questions
Full rewrites take long, freeze improvements to the business in the meantime and often miss rules buried in the old code. Incremental modernisation delivers value along the way and limits the damage if something goes wrong in one slice.
Usually. We can work with direct database access, file exports, message queues, email-based interfaces or, as a last resort, screen automation. We assess reliability and vendor terms for each route before choosing one.
Changes run in parallel with the existing system first, cutovers happen in small steps at quiet moments, and every step has a tested rollback. Operations teams are involved in the timing of each switch.
An API layer around one system is a contained project, while retiring a core platform happens over a longer series of releases. Because each slice delivers value on its own, you can pause or reprioritise as you go. We agree the timeline after discovery.