Senior Front-End Developer

External Job Description

Key Responsibilities

• Build and maintain core front-end components using React.js, TypeScript, and modern tooling (Vite, Webpack, esbuild).
• Create intuitive, accessible, responsive UIs using strong UX principles, design tokens, and component libraries (Storybook, shadcn/ui, MUI, Radix, Tailwind).
• Implement state management with Redux Toolkit, Zustand, React Query, or Context API.
• Integrate with REST/GraphQL APIs, authentication (OAuth2, OIDC, JWT), and real-time data (WebSockets, SSE).
• Architect modular, scalable systems including component-driven design and micro-frontends.
• Optimize performance: bundle size, lazy loading, code splitting, caching, Core Web Vitals.
• Ensure cross-browser compatibility, responsive design, and accessibility (WCAG 2.1/2.2, ARIA).
• Write unit, integration, and E2E tests (Jest, Vitest, RTL, Playwright, Cypress).
• Maintain CI/CD pipelines, preview deployments, and automated quality checks (ESLint, Prettier, strict TypeScript).
• Collaborate with designers and product teams to translate Figma designs into production-ready interfaces.
• Troubleshoot UI, performance, and integration issues across demo, MVP, and production.
• Establish front-end standards, documentation, and component review processes.

Qualifications

• Bachelor’s/Master’s in CS, Engineering, HCI, or equivalent experience.
• 5+ years building production web applications with a front-end focus.
• Expert in JavaScript (ES2020+) and TypeScript.
• Strong experience with React, Hooks, and ecosystem tools (React Router, React Query, Redux Toolkit, Zustand).
• Deep knowledge of HTML5, modern CSS, responsive design, and CSS frameworks (Tailwind, styled-components, Emotion).
• Solid understanding of build tools (Vite, Webpack, Rollup, esbuild).
• Experience with REST/GraphQL, caching, error handling, and auth flows.
• Familiarity with accessibility standards and inclusive design.
• Strong testing background across unit, integration, and E2E layers.
• Proficiency with Git workflows and collaborative development.

Preferred Skills

• Experience with scalable architectures: micro-frontends, module federation, monorepos (Nx, Turborepo, pnpm).
• Familiarity with Next.js or Remix (SSR, SSG, ISR).
• Strong design system experience (Storybook, Radix, Headless UI, shadcn/ui).
• Data visualization (D3, Recharts, Visx, Chart.js, ECharts).
• WebGL/advanced visualization (Three.js, R3F, Deck.gl).
• Performance optimization (Lighthouse, Core Web Vitals, profiling).
• PWAs, service workers, offline-first patterns, push notifications.
• i18n/l10n frameworks (react-i18next, FormatJS).
• Front-end DevOps and deployment tools (Vercel, Netlify, AWS Amplify, CloudFront).
• Front-end security best practices (CSP, XSS/CSRF prevention, secure auth).
• Ability to define engineering standards, mentor teammates, and guide design system governance.