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

. You’ll 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. You’ll 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,

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.