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.
Strengthen core security mechanisms including cryptographic protocols, WebPKI, and security-sensitive web APIs.
Contribute to security initiatives by investigating 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 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 effectively in large, complex, multi-language codebases.
Experience collaborating with distributed teams and clear communication of technical ideas both in writing and conversation.

Generous performance-based bonus plans for all eligible employees.
Generous retirement contributions with 100% immediate vesting regardless of personal contributions.
Quarterly all-company wellness days for collective pause.
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 EAP depending on country.