Senior Frontend Developer – Tech Lead
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Job Description
Frontend tech lead owning React and Next.js architecture for complex interactive graphics. Guiding performance, API integration, testing and technical mentoring.
Responsibilities:
- Own technical direction for complex front-end features
- Support the team through design decisions, reviews and mentoring
- Define scalable front-end architecture with clear boundaries between UI, business logic and data access
- Design reusable component libraries and govern consistent component APIs
- Implement interfaces from detailed visual specifications and design systems
- Integrate REST APIs and validate API contracts with backend teams
- Optimize performance through profiling, memoisation, code splitting, lazy loading and bundle analysis
- Build graphics-heavy interfaces using WebGL, three.js or React Three Fiber
- Manage events and interactions across layered UI and graphics surfaces
- Integrate map SDKs and manage coordinate systems, provider fallbacks and API tokens
- Build components that integrate cleanly into existing host applications
- Develop and maintain testing strategies using Vitest or Jest and React Testing Library
- Contribute to CI/CD pipelines, Git workflows and pull-request reviews
- Mentor team members, break down tasks, estimate work and produce technical documentation
- Apply front-end security fundamentals
Requirements:
- 5 to 8 years of experience
- 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
- Good to have: experience with advanced animation libraries such as GSAP or Framer Motion
- Good to have: experience with charting and data-visualisation libraries
- Good to have: experience with visual regression testing or end-to-end testing using Playwright
- Good to have: experience with internationalisation and localisation at scale
- Good to have: familiarity with micro-frontends, monorepos or design-system governance
- Good to have: experience with production observability, release support and incident investigation
- Good to have: experience leading technical discovery or proof-of-concept work for complex interactions
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