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Browser Security Engineer

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Perplexity

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Location:
United States , San Francisco

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

210000.00 - 385000.00 USD / Year
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Job Description:

As Comet continues to grow as a stand-alone product and codebase, we are seeking a Browser Security Engineer to lead and own browser-specific security initiatives, including custom Chromium development, extension security, and cross-device features.

Job Responsibility:

  • 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

Nice to have:

  • 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
What we offer:
  • Offers Equity
  • Full-time U.S. employees enjoy a comprehensive benefits program including equity, health, dental, vision, retirement, fitness, commuter and dependent care accounts, and more
  • Full-time employees outside the U.S. enjoy a comprehensive benefits program tailored to their region of residence

Additional Information:

Job Posted:
February 21, 2026

Employment Type:
Fulltime
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