> Markdown version of [/jobs/ext/1576866-react-developer-legacy-modernisation](https://www.wearedevelopers.com/jobs/ext/1576866-react-developer-legacy-modernisation). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# React Developer Legacy Modernisation

- **Company:** gb
IO Associates
- **Location:** Salford, UK (Remote available)
- **Salary:** £104,000.0
- **Contract:** Temporary to permanent
- **Skills:** JavaScript (Programming Language), TypeScript, ReactJS, Legacy Systems
- **Published:** July 24, 2026
- **Apply:** https://www.totaljobs.com/job/react-developer/io-associates-job107728751

## About the Role

* Strong commercial experience with React
 * Excellent JavaScript / TypeScript skills
 * Experience working on large enterprise or legacy applications
 * Experience modernising or migrating legacy systems
 * Exposure to Objective-J, Cappuccino or similar legacy frontend technologies

## Description

The client isn't expecting someone who's spent the last five years writing Objective-J. They're looking for a strong React engineer who is comfortable understanding an existing Objective-J/Cappuccino codebase, making changes where required, and helping drive the migration to React over time.


## Related Videos

- [The Pragmatic Architect: Balancing Necessity vs. Sufficiency in React Systems](https://www.wearedevelopers.com/videos/2101-the-pragmatic-architect-balancing-necessity-vs-sufficiency-in-react-systems)
- [How to TDD in legacy code](https://www.wearedevelopers.com/videos/309-how-to-tdd-in-legacy-code)
- [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs)
- [Do TypeScript without TypeScript](https://www.wearedevelopers.com/videos/327-do-typescript-without-typescript)
- [Web development best practices in 2021](https://www.wearedevelopers.com/videos/280-web-development-best-practices-in-2021)
- [Getting to Know Your Legacy (System) with AI-Driven Software Archeology](https://www.wearedevelopers.com/videos/1437-getting-to-know-your-legacy-system-with-ai-driven-software-archeology)

## Related Articles

- [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025)
- [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023)
- [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025)
- [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)
- [Frontend Developer Salary in The UK](https://www.wearedevelopers.com/magazine/233-frontend-developer-salary-in-the-uk)
- [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)