Senior Firefox Security Engineer - Remote/Barcelona

JobFluent; United States; Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Performance bonus

Retirement contributions

Wellness days

Country holidays + birthday

Home office stipend

Professional development budget

Parental leave

Employee referral program

Job summary

Mozilla Corporation seeks a Senior Software Engineer, Firefox Security to design and implement security features across Firefox for Barcelona or remote roles. You will work on privilege isolation, cryptographic protocols, and WebPKI to strengthen the browser’s security posture.

You should have 3+ years in low-level software engineering with C/C++, plus familiarity with web technologies and Rust. Strong collaboration across distributed teams is essential.

Qualifications

• 3+ years of systems programming experience with strong C/C++ skills.
• Solid understanding of security fundamentals.

Responsibilities

• Design, build and ship security features for Firefox across platforms.
• Advance Firefox security architecture and improve core security mechanisms.
• Investigate security issues with cross-team collaboration and deliver fixes.
• Improve browser reliability, performance, and memory usage in a multithreaded environment.

Skills

Systems programming

Security knowledge

Debugging

Web technologies

Rust familiarity

Collaborative communication

Job description

Mozilla Corporation seeks a Senior Software Engineer, Firefox Security to design and implement security features across Firefox for Barcelona or remote roles. You will work on privilege isolation, cryptographic protocols, and WebPKI to strengthen the browser’s security posture.

You should have 3+ years in low-level software engineering with C/C++, plus familiarity with web technologies and Rust. Strong collaboration across distributed teams is essential.