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 building privilege isolation and moving trust boundaries or strengthen core security mechanisms including 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 related to stability, correctness, performance, and memory usage in a multithreaded environment.

Requirements

3+ years of systems programming experience with strong proficiency in C and/or C++ and a 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 and communication skills, with experience working in distributed teams and clearly conveying technical ideas.

Generous performance-based bonus plans for eligible employees.
Generous retirement contributions with 100% immediate vesting regardless of contribution.
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.
Other benefits including life/AD&D, disability, and employee assistance programs (varies by country).