Full Stack Engineer - Chrome Extensions & Firefox WebExtensions

Description : We are looking for a highly skilled Software Engineer with deep expertise in browser extensions and web automation to build scalable, secure, and intelligent front-end solutions. Youll work at the intersection of modern web technologies, automation, and LLM-powered workflows, contributing to cutting-edge developer and AI-driven products.

Role : Full stack Engineer

Experience : 4+ Years

Location : Kolkata (Hybrid)

Notice Period : Immediate to 30 days preferred

Key Responsibilities :

- Design, develop, and maintain high-performance browser extensions (Chrome, Firefox, etc.)

- Build web automation pipelines interacting with complex DOM structures

- Integrate LLM-based workflows for automation, data extraction, and intelligent assistance

- Collaborate with backend teams to consume and expose REST/GraphQL APIs

- Ensure security, privacy, and performance best practices in extension development

- Write clean, testable, and scalable code with strong focus on quality

- Participate in CI/CD pipelines, automated testing, and release processes

Must-Have Skills :

- 4+ years of professional software engineering experience

- Minimum 1 years hands-on experience with browser extensions or web automation tools

- Strong proficiency in JavaScript / TypeScript, HTML5, CSS3

- Experience with Chrome Extensions (Manifest V3) and Firefox WebExtensions

- Solid understanding of modern Web APIs

- Experience with RESTful APIs, JSON, GraphQL, and WebSockets

- Familiarity with frontend frameworks such as React or Angular

- Experience integrating LLMs (OpenAI, Anthropic, local models) and prompt design

- Backend experience using Node.js / Python / Go

- Strong understanding of browser extension security (permissions, sandboxing, data privacy)

- Hands-on experience with CI/CD, Docker, and containerized environments

- Excellent problem-solving skills and ability to thrive in a fast-paced setup

Nice-to-Have Skills :

- Background in AI/ML, especially LLM-driven automation or code generation

- Experience with Chrome DevTools Protocol (CDP)

- Exposure to web automation tools like Puppeteer, Playwright, or Selenium

- Experience with data annotation, evaluation frameworks, or AI quality pipelines

- Prior work on developer tools, web security, or automation frameworks

Why Join Us? :

- Work on cutting-edge AI + Web automation products

- High ownership and real-world impact

- Collaborate with a strong engineering and AI-focused team

- Opportunity to shape next-gen developer and automation tools