AngularJS to React Migration

Overview

I led the migration of significant parts of a legacy AngularJS frontend to a modern React and TypeScript architecture, improving maintainability, performance, security and accessibility while keeping the legacy system live.

Problem

The existing AngularJS codebase had become difficult to extend and maintain. Performance issues, accessibility limitations, and developer friction were slowing delivery.

Solution

Introduced a tenant-aware data layer, updated access control flows, and shipped migration tooling for live accounts.

• Identified high-value areas suitable for incremental migration
• Designed new UI/UX for React components to modernise and improve existing features
• Refactored API contracts to better support modern frontend patterns
• Introduced TanStack React Query to manage data fetching and caching
• Improved accessibility (keyboard navigation, screen reader support)
• Reduced coupling between UI components and backend implementation details

Outcome

Reduced regression risk, improved perceived speed, and unlocked a faster cadence for new product features.

• Improved frontend performance and responsiveness
• Reduced complexity and technical debt in migrated areas
• Established a clear path for continued migration without big-bang rewrites
• Improved developer experience and confidence when making changes

Role

Defined the migration approach, established the component architecture, re-designed and modernised UI/UX, implemented key parts of the React frontend and coordinated incremental releases.

Tech Stack