Remote Senior Firefox Security Engineer

Mozilla; France; Remote; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Bonus plans

Retirement contributions

Home office stipend

Professional development budget

Parental leave

Job summary

Mozilla seeks a Senior Software Engineer to design, build and implement security features for Firefox, with a focus on enterprise users and multi-OS support. You will strengthen core security mechanisms and cryptographic protocols while collaborating across teams in a large, multilingual codebase.

You will diagnose issues, improve performance, and contribute to security initiatives in a remote-capable role based in France, supporting Mozillaopen-source mission and impact.

Qualifications

• 3+ years of experience in low-level software engineering with strong security fundamentals.
• Experience diagnosing and resolving issues in multithreaded, cross-platform native applications.
• Familiarity with web technologies (HTML, CSS, JavaScript) and interest or experience in Rust; ability to work within large, multi-language codebases.

Responsibilities

• Design, build and implement security and hardening features for Firefox.Design, implement, test, and ship cutting-edge security features for enterprise users.
• Advance Firefox security architecture across multiple operating systems and improve core security mechanisms.
• Collaborate across teams to investigate security issues, identify root causes, and deliver robust fixes.
• Improve browser reliability and performance in a large, complex environment.

Skills

Systems programming

Debugging

Web technologies

Collaboration & comms

Tools

C

C++

Rust

Web techs

Job description

Mozilla seeks a Senior Software Engineer to design, build and implement security features for Firefox, with a focus on enterprise users and multi-OS support. You will strengthen core security mechanisms and cryptographic protocols while collaborating across teams in a large, multilingual codebase.

You will diagnose issues, improve performance, and contribute to security initiatives in a remote-capable role based in France, supporting Mozillaopen-source mission and impact.