Senior Frontend Developer - Reactjs

As a skilled and experienced Senior Frontend Developer, you will lead the development of a real-time messaging web application. Your primary responsibility will be to build a high-performance, responsive, and secure web client that offers a seamless communication experience across various devices and platforms. You will collaborate closely with product, design, backend, and mobile teams to ensure the delivery of a world-class communication platform. Key Responsibilities: - 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 such as real-time chat, group messaging, media sharing, typing indicators, read receipts, and notifications. - Create reusable UI components to maintain a consistent design across the platform. - Integrate WebSockets, WebRTC, or similar real-time communication protocols to support live chat and media sharing. - Collaborate with backend/security teams to implement end-to-end encryption, secure session management, and authentication workflows. - Optimize the app for performance, accessibility, and responsiveness across browsers and screen sizes. - Write unit, integration, and end-to-end tests using tools like Jest, Cypress, or Playwright. - Work with backend and mobile teams to align feature development and integrate frontend with RESTful and WebSocket APIs. - Contribute to CI/CD pipelines, release management, and production monitoring. Qualifications Required: - 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 including 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.,