What you'll be doing

Design, build, and implement security and hardening features for enterprise users to strengthen Firefox’s security posture.
Advance Firefox’s security architecture across multiple operating systems by building privilege isolation and moving trust boundaries or improving 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, maintainable 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 and strong proficiency in C and/or C++ with solid security fundamentals.
Experience in debugging and problem-solving multithreaded, cross-platform native applications, including addressing memory and performance challenges.
Familiarity with web technologies such as HTML, CSS, and JavaScript, and interest or experience in Rust.
Ability to work effectively within large, complex, multi-language codebases.
Experience collaborating with distributed teams and communicating technical ideas clearly both verbally and in writing.

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.
Other benefits including life/AD&D, disability, Employee Assistance Programs, varying by country.