Front End Engineer

Job Description

Front End Developer (React) to join the CORE team in Tax Admin. Experienced developer needed with experience working with a UI/UX Design lead and developing in JavaScript React.

Minimum requirements

• Strong Front End fundamentals: semantic HTML, modern CSS and JavaScript, including responsive and accessible development.
• Commercial experience with React and TypeScript.
• Experience with a modern full-stack React framework, specifically Remix or React Router v7+.
• Practical Server Side rendering experience, including loaders/actions, forms, routing, error handling and Server Side session patterns.
• A clear understanding of progressive enhancement and the ability to build core journeys that do not depend entirely on client-side JavaScript.
• Experience using Material UI to build reusable, accessible components.
• Experience writing automated tests, including unit/integration tests and Playwright end-to-end tests.
• Comfortable integrating with REST APIs and working with Git-based development and code-review processes.
• Accessibility to WCAG 2.2 AA, including semantic HTML, keyboard navigation, screen-reader testing and automated accessibility checks.

Ideal additional experience

• React Router framework mode, including data APIs, nested routes, form actions and streaming SSR.
• Node.js and Express, particularly where the Front End includes a server or Back End-for-Front End layer.
• Design-system and component-library development using custom design patterns, encompassing MUI, Storybook and Figma.
• Runtime validation and contract-first API integration, for example Zod and OpenAPI-generated types.
• Authentication, authorisation and secure session management using OAuth 2.0/OpenID Connect.
• CI/CD, dependency management and Front End security practices.
• Experience working in regulated or government environments and collaborating closely with various stakeholders, including UX, API, test and platform teams.