Senior Frontend Developer – Tech Lead

• Own technical direction for complex front-end features
• Support the team through design decisions, reviews and mentoring
• Develop React and Next.js front-end features
• Design front-end architecture, performance solutions and integrations
• Build interactive graphics and map-based interfaces
• Contribute to technical discovery and proof-of-concept work for complex interactions

• Advanced experience with React, Next.js, TypeScript and modern hooks-based component design
• Ability to design scalable front-end architecture with a single source of truth and clear boundaries between UI, business logic and data access
• Experience designing reusable component libraries and governing consistent component APIs
• Deep experience with Zustand, Redux Toolkit or an equivalent state-management approach, including efficient selector design
• Strong HTML, CSS and SCSS skills, including responsive design, accessibility and style isolation
• Experience implementing interfaces from detailed visual specifications and using design systems such as IBM Carbon or Material UI
• Strong REST API integration experience, including typed models, adapters, polling and defensive handling of missing or inconsistent data
• Experience defining or validating API contracts with backend teams and applying contract-testing principles
• Demonstrated performance expertise, including profiling, memoisation, code splitting, lazy loading and bundle analysis
• Awareness of frame rate, GPU utilisation and memory behaviour on graphics-heavy screens
• Hands-on experience with WebGL, three.js or React Three Fiber, including scene and camera control, pointer picking and animation timelines
• Experience managing events and interaction across layered UI and graphics surfaces
• Experience integrating map SDKs, handling coordinate systems, implementing provider fallbacks and managing API tokens safely
• Ability to build components that integrate into an existing host application through clean props and callbacks, isolated styles and no unintended global side effects
• Strong testing experience with Vitest or Jest and React Testing Library, supported by a practical test strategy
• Experience with strict TypeScript, error boundaries, cross-browser testing and browser DevTools
• Experience contributing to CI/CD pipelines, Git workflows and high-quality pull-request reviews
• Experience with Azure DevOps
• Proven technical leadership through mentoring, task breakdown, estimation and technical documentation
• Understanding of front-end security fundamentals, including secure environment configuration, safe logging and responsible third-party dependency use
• Experience with advanced animation libraries such as GSAP or Framer Motion
• Experience with charting and data-visualisation libraries
• Experience with visual regression testing or end-to-end testing using Playwright
• Experience with internationalisation and localisation at scale
• Familiarity with micro-frontends, monorepos or design-system governance
• Experience with production observability, release support and incident investigation
• Experience leading technical discovery or proof-of-concept work for complex interactions