Principal Browser Extension Engineer-Security & Performance

Cyberhaven; United States; On-site; USD 120,000 - 180,000; Full time

Job summary

Cyberhaven is seeking an experienced engineer to design, build, and maintain a robust browser extension across Chrome, Edge, and other major browsers using Manifest V3. You will integrate securely with backend services and collaborate with endpoint and backend teams for seamless cross-device functionality.

Applicants should have 5+ years in software engineering, with 3+ years on browser extensions, strong JS/TS and HTML/CSS skills, and a solid understanding of security implications and secure

Qualifications

• 5+ years of software engineering experience, with at least 3 years focused on browser extension development.
• Strong proficiency in JavaScript/TypeScript, HTML/CSS, and modern web technologies.
• Deep understanding of browser extension APIs and security implications.
• Experience with secure coding practices and handling untrusted data.

Responsibilities

• Design, build, and maintain a robust browser extension for Chrome, Edge, and other major browsers using Manifest V3 and modern APIs.
• Implement features that securely interact with web content and backend services, ensuring compliance with security best practices.
• Optimize performance and reliability across diverse environments and user workflows.
• Work closely with the endpoint agent and backend teams to ensure tight integration and consistent functionality across endpoints and services.
• Stay ahead of evolving browser APIs, security standards, and extension ecosystem changes.
• Participate in code reviews, testing, and continuous improvement of development processes.

Skills

JavaScript/TypeScript

HTML/CSS

Web technologies

Communication skills

Tools

Go

Job description

Cyberhaven is seeking an experienced engineer to design, build, and maintain a robust browser extension across Chrome, Edge, and other major browsers using Manifest V3. You will integrate securely with backend services and collaborate with endpoint and backend teams for seamless cross-device functionality.

Applicants should have 5+ years in software engineering, with 3+ years on browser extensions, strong JS/TS and HTML/CSS skills, and a solid understanding of security implications and secure