What you'll be doing

• Design, build, and implement security and hardening features for enterprise users.
• Advance Firefox’s security architecture across multiple operating systems by improving privilege isolation, trust boundaries, cryptographic protocols, WebPKI, and security-sensitive web APIs.
• Contribute to security initiatives by investigating security issues, identifying root causes, and delivering robust fixes.
• Improve browser reliability and performance by diagnosing and resolving issues affecting stability, correctness, performance, and memory usage in a complex, multithreaded environment.

Requirements

• 3+ years of systems programming experience with strong proficiency in C and/or C++ and solid understanding of security fundamentals.
• Experience debugging and solving problems in multithreaded, cross-platform native applications, including memory and performance challenges.
• Familiarity with web technologies (HTML, CSS, JavaScript) and interest or experience in Rust; ability to work within large, complex, multi-language codebases.
• Effective collaboration skills and experience working with distributed teams, with strong written and verbal communication abilities.

Perks and benefits

• Generous performance-based bonus plans for eligible employees.
• Generous retirement contributions with 100% immediate vesting regardless of employee contributions.
• Quarterly all-company wellness days.
• Country-specific holidays plus a day off for your birthday.
• One-time home office stipend.
• Annual professional development budget.
• Quarterly well-being stipend.
• Considerable paid parental leave.
• Employee referral bonus program.
• Additional benefits including life/AD&D insurance, disability coverage, and Employee Assistance Program (varies by country).