Service
Legacy Software Modernization Services
Legacy systems run the business and hold it back at the same time. NexusNao modernizes ageing software incrementally — stabilising what's fragile, extracting what's valuable and replacing what's limiting — while the business keeps running.
Problems we solve
Sound familiar?
Critical systems only one retiring engineer understands
Every small change taking weeks and breaking something else
Integration walls blocking new products and AI initiatives
Security and compliance exposure from unsupported stacks
Capabilities
What NexusNao delivers
Legacy system audit
Code, data, dependency and risk assessment with a prioritised modernization map.
Strangler-fig migration
Replace functionality slice by slice behind stable interfaces — no big bang.
Data migration
Careful extraction, validation and cut-over of business-critical data.
API enablement
Wrap legacy cores with modern APIs so new products can move fast now.
Test harness construction
Characterisation tests around untested code so change becomes safe.
Typical use cases
Where this lands first
- Replacing end-of-life platforms and frameworks
- Monolith decomposition where evidence supports it
- Desktop-to-web application migration
- Database modernisation and consolidation
- Preparing legacy estates for AI integration
Recommended technology
Tools we reach for
- TypeScript & Node.js
- Python
- .NET & Java (interop)
- PostgreSQL
- Docker & Kubernetes
- Terraform
Final technology choices are made per project, on evidence — never by default.
Delivery process
How the engagement runs
Assess
Risk-ranked audit of code, data, infrastructure and knowledge.
Stabilise
Tests, monitoring and backups around the fragile core.
Migrate
Incremental replacement with parallel-run verification.
Retire
Deliberate decommissioning with documented cut-over.
Benefits
What you get out of it
Modernisation without a risky big-bang cut-over
Change velocity restored to a fearful codebase
Security and compliance exposure retired
A foundation ready for AI and new products
FAQ
Legacy Software Modernization questions
Straight answers to the questions teams usually bring us.
Rewrite or refactor?
Almost always incremental. Full rewrites carry enormous risk; the strangler-fig approach delivers value continuously and lets you stop at any point with a better system than you started with.
Will the business experience downtime?
Migrations are designed around parallel running and reversible cut-overs, typically scheduled inside existing maintenance windows. Zero-downtime patterns are used where operations demand them.
Our system has no documentation. Is that a problem?
It's common. We reconstruct understanding through code analysis, characterisation tests and interviews with the people who operate the system daily.
Related services
Often combined with
Intelligence, made operational.
Ready to talk legacy software modernization?
Share where you are today. We'll respond with an honest read on feasibility, timeline and the fastest route to value.