We are seeking a highly skilled
Browser Extension Developer
with expertise in
Core
Java Script , up-to-date frameworks. The ideal candidate should have robust
Object-Oriented Programming (OOP) skills , adhere to
SOLID principles , and have a deep understanding of
browser extension development
across multiple platforms (Chrome, Firefox, Edge).
The role involves designing and developing scalable browser extensions, implementing authentication mechanisms (JWT, OAuth, SSO), and ensuring secure, high-performance applications. You will work closely with backend services built using
Flask, Django , or similar frameworks, requiring an in-depth knowledge of
HTTP(s) protocols, authentication workflows, and security best practices .
Key Responsibilities: Develop, enhance, and maintain cross-browser extensions with a scalable architecture. Design modular, testable, and maintainable code following
SOLID
and
OOP
best practices. Implement authentication mechanisms such as
JWT, OAuth, SSO , and manage session security. Ensure deep integration with browser APIs ( Storage, Messaging, Web Navigation, Web Request, Web Authn ). Optimize extension performance for modern web environments (Single Page Applications, multi-frame handling). Work with
backend systems
(Flask/Django) to build APIs, handle data securely, and ensure smooth communication between frontend and backend. Develop and implement security measures against XSS, CSRF, CORS, and other web vulnerabilities. Debug and troubleshoot issues across different browsers and platforms. Collaborate with cross-functional teams to design and implement new features. Stay updated with the latest browser and web technologies,



ensuring compliance with extension store policies.
Required Skills & Qualifications: Strong expertise in Java Script, Type Script , and modern JS frameworks (React, Vue, or similar). Expert-level knowledge of browser extension development
(Chrome, Firefox, Edge APIs). Solid understanding of
OOP, SOLID principles, and design patterns . Strong experience with
HTTP(s) protocols, RESTful APIs, Web Sockets , and request handling. Hands-on experience with
authentication mechanisms
(JWT, OAuth 2.0, OpenID Connect, SAML, SSO). Experience working with
backend frameworks
(Flask, Django) and integrating APIs with frontend applications. Knowledge of browser security models and handling
CORS, Same Site cookies, and Content Security Policy (CSP) . Experience with debugging tools like Chrome Dev Tools, browser profiling, and network tracing. Familiarity with
state management
(Redux, Vuex) and event-driven architectures. Strong debugging and problem-solving skills in cross-browser environments. Knowledge of
build tools
(Webpack, Vite, Babel) and CI/CD pipelines. Experience working with
databases (PostgreSQL, MongoDB, Redis)
is a plus. Excellent communication skills and ability to work in a collaborative environment.
Preferred Qualifications: Experience with
service workers, background scripts, and content scripts
in browser extensions. Understanding of
identity federation , OAuth flows in enterprise environments, and SAML authentication. Familiarity with
Web Authn
for passwordless authentication. Experience in
automated testing
for browser extensions (Jest, Puppeteer, Playwright).
Write to me @

📌 Browser Extension Developer - Cybersecurity startup focused on developing cutting-edge solutions (India)
🏢 CareerXperts Consulting
📍 India