Lead Frontend Developer - Reactjs

About the Role

We are looking for a skilled and experienced Lead Frontend Developer to lead the development of our real-time messaging web application . Youll be responsible for building a high-performance, responsive, and secure web client that mirrors the mobile experience complete with messaging, notifications, media sharing, and end-to-end encryption.

Youll work closely with the product, design, backend, and mobile teams to deliver a world-class communication experience that works across devices and platforms.

Key Responsibilities

1. Frontend Architecture & Development

• Design and implement a performant, modular, and scalable web app using React , TypeScript , Next.js , or other modern frameworks.
• Build and maintain core messaging features: real-time chat , group messaging , media sharing , typing indicators , read receipts , and notifications .
• Create reusable UI components and ensure consistent design across the platform.

2. Real-Time Communication

• Integrate WebSockets , WebRTC , or similar real-time communication protocols to support live chat and media sharing.
• Ensure message syncing, delivery tracking, offline handling, and real-time UI updates.

3. Security & Privacy

• Collaborate with backend/security teams to implement end-to-end encryption , secure session management , and authentication workflows .
• Ensure secure data handling in the browser local storage, cookies, tokens, and message caching.

4. Cross-Platform Optimization

• Optimize the app for performance, accessibility, and responsiveness across browsers and screen sizes.
• Ensure smooth operation on Chrome, Firefox, Safari, and Edge.

5. Testing & Quality Assurance

• Write unit , integration , and end-to-end tests using tools like Jest , Cypress , or Playwright .
• Participate in code reviews, test automation, and bug triaging.

6. Collaboration & Deployment

• Work with backend (Java/Erlang) and mobile teams (iOS/Android) to align feature development.
• Integrate frontend with RESTful and WebSocket APIs.
• Contribute to CI/CD pipelines , release management, and production monitoring.

Required Qualifications

• 6+ years of professional experience in web development, building production-grade applications.
• Proficient in JavaScript/TypeScript and modern frontend frameworks (preferably React and Next ).
• Experience with real-time communication using WebSockets , Firebase , or similar technologies.
• Strong understanding of HTML5 , CSS3 , Responsive Design , and Cross-Browser Compatibility .
• Familiarity with REST APIs , WebSocket APIs, and frontend state management (Redux, Zustand, etc.).
• Good grasp of security principles XSS, CSRF, CQRS, HTTPS, token handling, and secure storage.
• Experience with performance profiling, lazy loading, code-splitting, and network optimization.

Preferred Qualifications

• Prior experience in messaging platforms , chat applications, or collaboration tools.
• Familiarity with end-to-end encryption , cryptography libraries (e.g., libsodium, OpenPGP.js).
• Experience with Service Workers , IndexedDB , or Progressive Web Apps (PWA) .
• Exposure to WebRTC , media streaming , or video/audio calling libraries.
• Contributions to open-source projects or strong personal GitHub portfolio.
• Experience working in agile teams with tools like Jira, Figma, and Git.