Senior Software Engineer, Firefox Security

This is a fully remote position, open to applicants in Spain.

📋 Description

• Design, develop, test, and deploy security and hardening features that enhance Firefox’s security framework for enterprise users.

• Contribute to and lead advancements in Firefox’s fundamental security posture across various operating systems by establishing privilege isolation and shifting trust boundaries.

• Enhance Firefox’s core security mechanisms, including cryptographic protocols, WebPKI, and security-sensitive web APIs.

• Collaborate with teams to investigate security vulnerabilities, pinpoint root causes, and implement robust, maintainable solutions.

• Diagnose and resolve issues impacting stability, accuracy, performance, and memory usage within a complex, multithreaded environment.

⛳️ Requirements

• Over 3 years of experience in low-level software engineering.

• Strong command of C and/or C++.

• Solid understanding of security principles.

• Experience in diagnosing and resolving issues in multithreaded, cross-platform native applications.

• Familiarity with memory and performance optimization challenges.

• Knowledge of web technologies (HTML, CSS, JavaScript).

• Interest in or experience with Rust.

• Ability to work effectively within large, intricate, multi-language codebases.

• Experience collaborating with distributed teams.

• Capability to communicate technical concepts clearly in both written and verbal formats.

🏝️ Benefits

• Generous performance-based bonus plans for all eligible employees, promoting shared success as one team.

• Substantial retirement contributions with 100% immediate vesting, regardless of personal contributions.

• Quarterly wellness days for the entire company to take a collective pause.

• Country-specific holidays plus an additional day off for your birthday.

• One-time stipend for home office setup.

• Annual budget for professional development.

• Quarterly stipends for well-being.

• Considerable paid parental leave.

• Employee referral bonus program.

• Additional benefits (life/AD&D, disability, EAP, etc. - varies by country).