Modernise Legacy Systems
Your legacy system generates revenue but blocks growth. We modernise it safely — no big-bang rewrites, no downtime.
8 wks
Typical delivery
100%
IP ownership
Week 1
First demo
The Problem
The Legacy Modernisation Trap
How CodeAir Solves It
Our Modernise Legacy Systems engagement is structured to address these exact challenges — with clear scope, weekly demos, and full IP ownership from day one.
Legacy code blocks new feature development
Developers afraid to change anything
Performance bottlenecks costing customers
Our Approach
How the Modernise Legacy Systems Engagement Works
Codebase Audit
Map the full system, identify risk zones, and prioritise modules.
Safe Extraction
Peel off isolated modules behind an API facade — zero disruption.
Incremental Replacement
Replace each module with a modern equivalent, tested in parallel.
Cutover
Final migration with rollback capability at every step.
Ready to Get Started?
Tell us your context and we'll scope an honest plan — no commitment required.
Capabilities
What's Included
Strangler-fig approach — zero big-bang rewrites
Core deliverable of this engagement.
Parallel-run testing on every phase
Core deliverable of this engagement.
Cloud-native re-architecture
Core deliverable of this engagement.
API-first design for future integrations
Core deliverable of this engagement.
Comprehensive documentation at each phase
Core deliverable of this engagement.
Our Approach
Our Approach
Legacy modernisation is the highest-stakes engineering challenge a business faces. Rewrite too aggressively and you break revenue. Do nothing and competitors outpace you. We use a strangler-fig pattern: incrementally replacing modules while the existing system keeps running. Each phase is tested, deployed, and validated before the next begins. You get a modern architecture without betting the business on a single big-bang rewrite.
Ideal For
Built For Teams Like Yours
Engagement Models
Three Engagement Models. One Delivery Standard.
Fixed-Scope Project
Best for: Defined deliverable
Clear scope, fixed cost. Ideal when you know exactly what you need.
Sprint Retainer
Best for: Ongoing iteration
Monthly engineering capacity. You direct the roadmap, we ship.
Team Extension
Best for: Scaling capacity
Embedded engineers. You keep full control.
Why CodeAir
Why Choose CodeAir?
Honest Scoping
We tell you what's achievable in your budget before we start — not after.
Weekly Demos
Real, working software every week. Not slide decks.
Full IP Ownership
All code, repos, credentials — yours from day one.
Senior Engineers
No juniors learning on your budget. Minimum 4 years production experience.
No Lock-in
Month-to-month engagements. You can scale up, down, or off at any time.
Clean Handover
Documented architecture, runbooks, and a knowledge transfer session at close.
FAQ
Questions About Modernise Legacy Systems
No. We use blue-green deployments and parallel runs throughout.
Typically 6-18 months depending on system complexity.
Yes — monolith-to-microservices is one of our core patterns.
After aligning on scope and signing the agreement, we typically begin embedding engineers or starting sprints within 5–7 business days.
You do. We transfer 100% of the repository ownership, code commits, configurations, and intellectual property to you from day one.
We work inside your Slack or Teams workspace, use project management tools like Linear/Jira, and run weekly live demos of working features.
Yes. You can scale the dedicated resource block up or down with a standard 14-day notice, matching your timeline pressure.
We execute strict mutual NDAs before scoping. Our development processes incorporate security practices like encrypted keys and GDPR compliance.
Every engagement includes a 30-day post-delivery support window to handle deployment adjustments. Monthly maintenance retainers are also available.
In the rare case of developer absence, we provide a pre-vetted replacement within 5 business days, absorbing all transition/onboarding costs.
Start Your Modernise Legacy Systems Engagement
Tell us where you are and what you're trying to achieve. We'll give you an honest scoped plan.