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Shipping a feature takes 6 months because the codebase is unmaintainable?
Legacy Modernization Services
Your legacy system isn't just old. It's the thing preventing you from shipping new features, hiring developers who can work on it, and integrating with the tools your business needs today.
We modernise legacy software incrementally -- replacing components one at a time while keeping your existing system running -- so you can move to modern architecture without stopping the business.
Incremental migration -- the existing system keeps running while we rebuild
We audit your codebase first and tell you honestly what's worth keeping
Fixed scope per phase -- no open-ended retainers
100+ products shipped, including legacy modernisation and platform rebuilds
Trusted by startups & global brands worldwide
The real cost of keeping legacy software running
Legacy software doesn't announce when it's breaking your business. It's quieter than that. Your best developers spend their time maintaining it instead of building new things. New hires take months to understand the codebase. Features that should take days take months. Integrations with modern tools require expensive workarounds.
The cost is not the server bill. It's the 6-month feature backlog, the 2 developers who quit because they didn't want to work in PHP 5, and the enterprise contract you lost because your system couldn't pass a security review.
For building the modern replacement system, our custom software development and product engineering services cover the full build. The fastest first step is often adding a modern API layer in front of the legacy system without touching the backend.
Legacy modernisation approaches
Incremental service extraction
We extract individual functions from the monolith and rebuild them as modern, independently deployable services. The monolith keeps running. Users don't notice. Over time, the monolith shrinks as modern services take over. This is the safest approach for systems that can't be taken offline.
API layer and strangler pattern
We build a modern API layer in front of the legacy system. New features and integrations talk to the API, not the legacy system directly. Over time, the API layer routes more and more functionality to modern services, and the legacy system is progressively retired. Users see a modern interface from day one.
Parallel rebuild
We build the replacement system on a parallel track while the legacy system continues running. Users are migrated in phases -- a department at a time, a user group at a time -- with rollback capability at each stage. When the replacement is proven in production, the legacy system is decommissioned.
Frontend modernisation
Sometimes the backend is sound but the frontend is what's failing -- a jQuery application, a server-rendered UI, or a desktop app that can't be mobile-accessed. We rebuild the frontend in React or Next.js with a modern API integration, without touching the backend until it's ready.
Database migration and data modernisation
Legacy databases are often the hardest part of a modernisation. Undocumented schemas, denormalised data, and business logic in stored procedures. We audit the data model, document the business rules embedded in the database, and design a migration path that preserves data integrity.
Cloud migration and infrastructure modernisation
On-premise servers, manual deployments, no CI/CD, no monitoring. Legacy infrastructure is as much a problem as legacy code. We migrate systems to cloud-native infrastructure (AWS, Azure, GCP), add automated deployment pipelines, and instrument monitoring so you know what's happening in production.
What you get from a legacy modernisation engagement
A codebase developers want to work in
After modernisation, your system runs on a stack that modern developers know, with test coverage that makes changes safe. Hiring gets easier. Onboarding takes days not months. The velocity of your engineering team goes up.
Integration capability with modern tools
A modernised system can talk to Salesforce, SAP, Stripe, AWS, and the other platforms your business needs. Legacy systems that can't integrate become islands -- data stuck in them, processes that should be automated stay manual. Modern systems integrate.
Reduced cost to operate and maintain
Legacy software is expensive to keep running. Security patches require specialist expertise. Bugs take longer to find and fix. Infrastructure is often over-provisioned because nobody dares touch it. Modernisation reduces the cost of running your software over time.
Not sure if your legacy system needs modernisation or replacement?
Start with an honest audit. We'll look at the codebase, tell you what we find, and give you a clear recommendation -- including when the answer is 'keep what you have.'
How we work
We start by reading your codebase before giving you any recommendations. The audit covers technical debt, architecture, test coverage, security vulnerabilities, dependencies, and the business logic buried in the code that nobody documented. You get a written report with a clear recommendation and a risk assessment.
Codebase and architecture review
Technical debt quantification
Dependency audit and security vulnerability scan
Business logic documentation from code analysis
Want an honest assessment of your legacy system?
We'll audit your codebase and tell you what we find -- including when the answer is to keep what you have. No sales pitch.
What our clients say
Case studies
Canada
UKRelated services
Enterprise Software Development — Build the enterprise-grade replacement system after modernisation
Custom Software Development — Full-stack custom software for businesses that need a modern foundation
API Development — Add a modern API layer in front of a legacy system without a full rebuild
Product Engineering — Business-first engineering to build what replaces your legacy system
ERP Development — Custom ERP to replace legacy finance or operations software
Start with an honest audit, not a sales pitch.
We'll tell you what's in your codebase, what it will cost to fix, and whether the investment is worth it.
Frequently asked questions
Legacy modernisation is the process of rebuilding or refactoring old software systems using modern technology, architecture, and development practices. The goal is to keep the business value of the existing system while removing the technical constraints that prevent it from being maintained, extended, or integrated with modern tools. Approaches range from encapsulating the legacy system with a modern API layer, to rewriting modules incrementally, to a full replacement on a parallel track.
We don't recommend big-bang rewrites. They fail more often than they succeed. When you rewrite a system in full, you spend a year discovering all the edge cases the original system handled -- and you've delivered nothing in the meantime. We favour an incremental approach where we replace components one at a time, with the existing system still running until each replacement is proven in production. This reduces risk and keeps the business running.
We start with a code and architecture audit. We look at the codebase, the data model, the dependencies, the infrastructure, and the deployment process. We tell you honestly what's worth keeping, what needs replacing, and what the risks are. That assessment takes 2--4 weeks and produces a written report with a recommended modernisation roadmap. You decide whether to proceed. The audit cost is separate from the build.
We've worked with legacy systems built in PHP, Java, .NET (classic), ColdFusion, Classic ASP, Ruby on Rails, and older Node.js codebases. We've also modernised systems built on outdated frameworks -- jQuery-era frontends, monolith Rails apps, and systems with no test coverage. The specific legacy technology matters less than the architecture -- the biggest challenge is usually an undocumented data model and business logic buried in code.
A contained modernisation -- for example, replacing a legacy frontend while keeping the backend, or extracting one module into a modern service -- takes 12--20 weeks. A full platform rebuild on a parallel track typically takes 9--18 months, depending on scope. We break it into phases with clear milestones. You own the decision to proceed at each phase boundary.
The biggest risk is undiscovered business logic. Legacy systems accumulate requirements over years, many of which are never documented -- they're just in the code. During a modernisation, it's common to find that the system does something important that nobody knew about until users started complaining after migration. We mitigate this with thorough audit, comprehensive test coverage of the legacy system before we touch it, and parallel running (new and old system live simultaneously during transition).