---
title: "Software Maintenance and Legacy Modernisation"
description: "Maintain and modernise existing software with code audits, bug fixes, new features, security work and incremental legacy upgrades without a risky rewrite."
url: "https://codesagelabs.com/services/software-modernisation"
type: "service"
provider: "Code Sage Labs"
area_served: "Worldwide, from Colombo, Sri Lanka"
---

# Software maintenance and modernisation

We take over software that already exists, including applications built by a previous vendor or an in-house team that has moved on. We start with a code audit and an honest account of what is there, then fix what is broken, add features, improve performance and security, and modernise step by step without a risky rewrite.

## What this service is

Taking over software that already exists: fixing what's broken, adding features, improving performance and modernising incrementally without a risky rewrite. We start by reading the code and telling you honestly what's there.

## What we build

- Codebase reviews and technical audits
- Bug fixing and stabilisation
- New features on existing platforms
- Performance and security improvements
- Incremental modernisation of legacy systems

## Typical projects

- Stabilising an application built by a previous vendor and documenting how it works
- Adding a new module to a platform without disrupting the parts that already work
- Upgrading an outdated framework version step by step, with tests added along the way

## Technologies

- React
- Java
- Python
- Node.js
- PostgreSQL
- MySQL

and most mainstream stacks. Tell us what yours is built on.

## Also searched as

- legacy software modernisation
- software maintenance services
- code audit
- application support
- take over software development

## Questions

### Can you take over an application another vendor built?

Yes. We begin by reading the code, documenting how it works and telling you plainly what state it is in before we quote for further work.

### Do we have to rewrite our legacy system?

Usually not. We modernise incrementally: upgrading frameworks, adding tests and replacing parts one at a time while the system keeps running.

### Which technologies do you support?

Most mainstream stacks, including React, Java, Python, Node.js, PHP, PostgreSQL and MySQL. Tell us what yours is built on and we will say honestly whether it is a fit.

## Related

- [All services](https://codesagelabs.com/services)
- [Web and mobile app development](https://codesagelabs.com/services/web-and-mobile-app-development)
- [Backend and API development](https://codesagelabs.com/services/backend-and-api-development)
- [System integration and API integration](https://codesagelabs.com/services/system-integration)
- [AI development and AI integration](https://codesagelabs.com/services/ai-development)
- [Cloud and DevOps services](https://codesagelabs.com/services/cloud-and-devops)
- [Start a project](https://codesagelabs.com/contact)

*Source: [https://codesagelabs.com/services/software-modernisation](https://codesagelabs.com/services/software-modernisation) — Code Sage Labs, Colombo, Sri Lanka. Contact: hello@codesagelabs.com*