Legacy Modernisation
Big-bang rewrites fail. We replace the highest-value domain first, run old and new side by side, and retire the legacy piece by piece.
Replace monoliths one domain at a time, in production, with compatibility shims and side-by-side routing instead of a big-bang cutover.
The method
- Map the estate and pick the domain with the highest churn or risk.
- Freeze the contract the rest of the estate depends on.
- Build the replacement behind the existing gateway with a compatibility shim.
- Route a slice of traffic, observe, expand, then retire the old component.
- Repeat, one domain per increment, with the business running throughout.
Migrations we have run in production
- A monolithic point-of-sale portal replaced screen by screen, with two applications served side by side under one domain.
- Cart and catalog domains rebuilt as new services while a dozen unchanged legacy services continued to be called.
- A logistics platform moved from one language and message broker to another with backward-compatible wrappers.
- A schemaless catalog migrated to a normalised relational model with a documented mapping.
AI-assisted modernisation
- Code and schema analysis to map dependencies and estimate effort.
- Test generation from observed production traffic to verify old and new behave the same.
Key features
- Estate Mapping
Services, data, dependencies and risk.
- Contract-First Replacement
Freeze interfaces before rebuilding.
- Compatibility Shims
Old route shapes preserved during migration.
- Side-by-Side Coexistence
Old and new applications under one domain.
- Incremental Data Migration
Dual-write and backfill strategies.
- Observability From Day One
Compare old and new behaviour in production.
Related solutions
All solutionsIntegration Platform & API Gateway
A governed API gateway and a reliable event backbone.
Read more Platform & ModernisationNetwork Operations Support (OSS)
Standards-aligned OSS for fibre and network operators.
Read more Commerce & SalesDigital Point of Sales (POS)
In-store and partner-network selling, online or offline.
Read moreWe'd love to hear from you!
Whether you have a question about our services and solutions or want to discuss a potential project, feel free to reach out.