Senior Front End Developer (Remote, UK)

• Build and improve features across our platform, from the server-rendered core to newer React/TypeScript areas
• Develop and maintain shared, reusable components and design tokens so the UI stays consistent at scale
• Work with complex, data-heavy interfaces - large grids, dashboards and interactive components - with an eye on performance
• Read, debug and safely refactor long-lived legacy code, leaving it better than you found it
• Set the bar on code quality, testing and front-end practice, and help mentor other developers
• Build testable UIs - stable test hooks (e.g. data-testid) and predictable component states - and work with QA to keep our automated end-to-end tests (Selenium/Jenkins) reliable

We’re looking for a senior front-end engineer who is excellent at the fundamentals - not just fluent in a framework, but someone who understands the browser, writes code built to last, and can move confidently through a large, established codebase. You’ll help shape our shift to React and a shared design system while keeping the existing platform solid and maintainable., * Expert vanilla JavaScript and DOM fundamentals - event handling, memory, performance profiling and debugging (deep language skill, not just framework experience)

• Strong CSS at scale - design tokens and maintaining a shared component/design system
• Production React with solid JavaScript/TypeScript
• Comfortable reading and debugging large legacy codebases
• A track record building enterprise applications, writing new code to a maintainable, long-lived standard
• Works with testing as standard - unit (Jest/Vitest, React Testing Library) and some end-to-end (Playwright or Cypress)
• Solid version control - Git or SVN (we use SVN; Git experience transfers directly)
• Able to mentor and raise standards across a team

Strongly desirable

• Data-grid experience - AG Grid ideal
• Experience maintaining a server-rendered, multi-page application
• Storybook for component development
• Awareness of accessibility (WCAG) in enterprise UI
• Experience making complex UIs (data grids, rich widgets)testable for automated end-to-end tests

• Competitive salary, dependent on experience
• Company pension
• Employee stock ownership plan
• Cycle to work scheme
• Casual dress
• The chance to modernise a mature, widely-used enterprise platform, working alongside a small, experienced team