Browser Security Engineer

Perplexity is seeking a Browser Security Engineer to lead and own browser-specific security initiatives as their product continues to grow. The role involves threat modeling, security architecture reviews, and collaboration with product and engineering teams to mitigate browser vulnerabilities and enhance security practices.

Responsibilities:

• Lead threat modeling and security architecture reviews for all Comet browser surfaces
• Collaborate closely with product and engineering teams to proactively identify and mitigate browser vulnerabilities, especially issues specific to custom Chrome engineering and browser extension architecture
• Develop security best practices, tooling, and documentation for engineers building browser-facing features
• Serve as the security expert for topics such as Same-Origin Policy (SOP), XSS, sandboxing, browser extension permissions, and secure inter-device communication
• Triage and resolve vulnerabilities found by external researchers (e.g., bug bounty, red-teaming partners) and the Chromium community
• Build strong relationships with security partners and leverage their feedback for continuous improvement
• Stay up to date on emerging browser security threats, tools, and industry trends

Requirements:

• Prior experience in browser, application, or product security (ideally with Chrome/Chromium or other browser engine experience)
• Deep knowledge of modern browser architectures; understanding of XSS, CSP, sandboxing, extension security, and WebView-specific threats
• Experience with security reviews and threat modeling for web, mobile, and extension platforms
• Ability to work cross-functionally with engineers, product leads, and external security researchers
• Contributions to open-source browser projects, security research, or participation in bug bounty programs
• Experience with web and mobile threat modeling
• Familiarity with secure sync and cross-device communication mechanisms
• Track record of proactive security work embedded within product teams