Senior Frontend Dev ( NextJS/ReactJS/TypeScript/HTML5 )

Top 3 reasons to join us

• FREE Gym at 5-star Center.
• Friendly and fun working environment.
• Team building every year.

Job description

We are building an online sports data platform with millions of daily visits and real-time data processing requirements. Our robust backend infrastructure runs on GCP/GKE, while the web frontend is distributed via CDN (Cloudflare) and optimized for speed and performance. We are looking for a Senior Frontend Developer (Next.js) to lead the architecture, optimize user experience, and ensure maximum performance.

Architecture & Optimization

• Build a Next.js architecture optimized for SEO, speed, and scalability.
• Implement SSR, ISR, lazy loading, code splitting, and image optimization.
• Minimize unnecessary re-renders using memoization and virtualization for large lists.
• Leverage Web Workers to handle heavy tasks (data processing, calculations) without affecting the UI.

Real-time Data Rendering

• Optimize UI rendering of WebSocket/Socket.IO data with high-frequency updates.
• Manage state effectively using Redux Toolkit or Zustand.
• Apply batch updates and throttling/debouncing to minimize unnecessary re-renders.

End-user Performance Optimization

• Compress, preload, and prefetch assets; optimize critical CSS/JS.
• Apply caching strategies (CDN + app-level cache).
• Monitor performance with Lighthouse, WebPageTest, Sentry, and LogRocket.

Quality & Testing

• Write unit, integration, and E2E tests using Jest, Testing Library, Cypress/Playwright.
• Conduct code reviews and provide technical guidance for the team.

Your skills and experience

Requirements

• Proficiency in Next.js, React, and TypeScript.
• Experience in optimizing the performance of large-scale web applications.
• Strong knowledge of HTML5, CSS3, SCSS/TailwindCSS.
• Hands-on experience with real-time data rendering & WebSocket.
• Experience working with Web Workers for heavy tasks.
• Solid understanding of SEO optimization for SSR/ISR.
• Familiarity with CDN (Cloudflare) and caching strategies.
• Experience with CI/CD pipelines, Docker, and Git.

 Specific Objectives

• Month 1: Audit frontend architecture & performance.
• Month 2: Finalize the design system & component library.
• Month 3: Optimize real-time data rendering.
• Month 4: Reduce TTI (Time to Interactive) by 30–50% on high-traffic pages.
• After 6 months: Achieve a Lighthouse Performance Score > 90 across all main pages.

Why you'll love working here

Benefits

• Competitive compensation package: Attractive base salary + performance-based bonuses (quarterly/yearly).
• Direct collaboration with senior leadership and the dynamic founding team.
• A professional, innovative, and growth-driven environment that fosters creativity.
• Opportunities to join advanced training programs domestically and internationally (when available).
• Full social insurance and benefits in accordance with regulations.
• Team building, annual trips, and internal engagement activities.

Working Hours 

Working Hours: 8:30 AM – 17:30 PM (Monday – Friday, off on Saturday & Sunday).