Senior Security Engineer - Firefox (Remote UK)

Mozilla; United Kingdom; Remote; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Performance-based bonus

Retirement contributions

Wellness days

Home office stipend

Professional development budget

Parental leave

Employee referral program

Job summary

Mozilla is seeking a Senior Software Engineer to design and implement enterprise security and hardening features for Firefox. You will advance security architecture across operating systems and work with distributed teams to deliver robust fixes.

You will diagnose issues affecting stability and performance in a complex, multi-threaded browser environment. The role emphasizes systems programming, strong C/C++, and familiarity with web technologies, with an openness to Rust.

Qualifications

• 3+ years of low-level software engineering experience.
• Strong C/C++ proficiency and security fundamentals.
• Familiarity with HTML, CSS, JavaScript; interest in Rust.
• Experience working with distributed teams and clear written communication.

Responsibilities

• Design, build and implement security and hardening features for enterprise users.
• Advance Firefox’s security architecture across multiple operating systems.
• Contribute to our security initiatives across teams.
• Improve browser reliability and performance in a multithreaded environment.

Skills

Systems programming

Security knowledge

Debugging

Web technologies

Rust interest

Collaborative communication

Job description

Mozilla is seeking a Senior Software Engineer to design and implement enterprise security and hardening features for Firefox. You will advance security architecture across operating systems and work with distributed teams to deliver robust fixes.

You will diagnose issues affecting stability and performance in a complex, multi-threaded browser environment. The role emphasizes systems programming, strong C/C++, and familiarity with web technologies, with an openness to Rust.