What you'll be doing

Design, build and implement security and hardening features for enterprise users, strengthening Firefox’s security posture.
Advance Firefox’s security architecture across multiple operating systems by building privilege isolation and moving trust boundaries.
Strengthen Firefox’s 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 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 diagnosing and resolving issues 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 within large, complex, multi-language codebases.
Experience working with distributed teams and clear communication skills both in writing and conversation.

Generous performance-based bonus plans for eligible employees.
Generous retirement contributions with 100% immediate vesting regardless of employee contributions.
Quarterly all-company wellness days where everyone takes a pause together.
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 insurance, disability, employee assistance programs, varying by country.