Lead Frontend Engineer – React
Quick Interview || Lead Frontend Engineer – React -Warren, NJ ( Onsite ) || C2CRequired Skills & QualificationsCore Frontend· 8+ years of professional frontend development experience with at least 5+ years in React.js.· Expert-level knowledge of JavaScript (ES6+), TypeScript, HTML5, and modern CSS (Flexbox, Grid).· Deep understanding of React internals — hooks, context, reconciliation, Suspense, concurrent features, Server Components.· Strong experience with Next.js (App Router, SSR/SSG/ISR) or Remix for production-grade applications.· Solid grasp of component design patterns, compound components, render props, and HOCs.State Management & Data· Hands-on experience with Redux Toolkit, Zustand, Recoil, Jotai, or MobX.· Proficiency with data-fetching libraries such as React Query (TanStack Query), SWR, or RTK Query.· Experience consuming REST and GraphQL APIs (Apollo Client, urql, or Relay).Styling & Design Systems· Expertise in CSS-in-JS (styled-components, Emotion), Tailwind CSS, CSS Modules, or SCSS.· Experience building and maintaining design systems and component libraries (Storybook, Bit).· Familiarity with Material UI, Ant Design, Chakra UI, Radix UI, or shadcn/ui.· Strong eye for UI/UX, accessibility (WCAG, ARIA), and responsive design.Tooling, Build & Performance· Strong command of modern bundlers and build tools: Vite, Webpack, Turbopack, esbuild, SWC, Babel.· Experience with monorepo tooling: Nx, Turborepo, Lerna, pnpm workspaces.· Performance tuning: code splitting, lazy loading, tree shaking, image optimization, Core Web Vitals.· Proficient with Git, GitHub/GitLab/Bitbucket, and trunk-based or GitFlow workflows.Testing & Quality· Hands-on with Jest, Vitest, React Testing Library, and end-to-end testing using Cypress or Playwright.· Experience with visual regression testing (Chromatic, Percy) and accessibility testing (axe, Lighthouse).· Strong understanding of unit, integration, contract, and E2E testing strategies.DevOps & CI/CD· Experience with CI/CD pipelines: GitHub Actions, GitLab CI, Jenkins, CircleCI, or Azure DevOps.· Familiarity with Docker, containerized frontends, and deployment to AWS, Azure, GCP, Vercel, or Netlify.· Understanding of CDNs, edge functions, caching strategies, and observability (Sentry, Datadog, LogRocket).Architecture & Best Practices· Strong grasp of micro-frontends, Module Federation, and large-scale frontend architecture.· Knowledge of authentication and authorization patterns: OAuth 2.0, OIDC, JWT, SSO.· Awareness of frontend security: XSS, CSRF, CSP, secure cookies, OWASP Top 10.· Familiarity with SOLID principles, clean architecture, and domain-driven design on the frontend.Leadership & Soft Skills· Proven track record of leading frontend teams and delivering complex projects on time.· Excellent verbal and written communication skills.· Strong problem-solving, analytical thinking, and decision-making ability.· Ability to balance technical excellence with pragmatic, business-driven trade-offs.· Comfortable mentoring junior engineers and influencing senior stakeholders.Nice to Have· Experience with React Native or cross-platform mobile development.· Contributions to open-source projects or a strong technical blog/portfolio.· Exposure to backend technologies (Node.js, NestJS, Express) for full-stack collaboration.· Experience with WebSockets, WebRTC, real-time collaboration, or streaming UIs.· Familiarity with AI-assisted developer tooling (Copilot, Cursor) and LLM-integrated UIs.·Experience working in regulated domains (Insurance, BFSI, Healthcare).Harsh JainSr.Technical Recruiterharsh.jain@quantumworldit.comlinkedin.com/in/harsh-jain-a7b541b018052256693 EXT : 845