Remote Senior Firefox Security Engineer

Mozilla; Town of Sweden (NY); On-site; USD 42,476 - 70,794; Full time

Benefits offered by this job

Performance bonus

Medical/dental/vision cover

Retirement contributions with vesting

Wellness days

Country specific holidays

Home office stipend

Professional development budget

Well‑being stipend

Parental leave

Employee referral program

Job summary

Mozilla is a global leader in open source and web security. This role focuses on advancing Firefox's security architecture, cryptography, and browser reliability in a remote Sweden setting.

You will help design and ship security features and collaborate with engineers worldwide to strengthen the web platform. You will contribute to standards‑based implementations, work across multi‑language codebases, and explore Rust while advancing the security of a widely used browser.

Qualifications

• Strong software engineering and security fundamentals across modern languages and systems.
• Experience building and maintaining complex software systems in security‑sensitive environments.
• Strong debugging and problem‑solving skills in multi‑threaded applications.
• Collaborative and effective communicator across distributed teams.

Responsibilities

• Advance Firefox's security architecture and cryptography stack in core features.
• Design and implement web platform security features in collaboration with teams.
• Improve browser reliability, performance, and memory efficiency.
• Collaborate on security initiatives, debugging, and long‑term solutions.
• Contribute to technical design and planning for security initiatives.

Skills

C/C++

Security fundamentals

Cryptography

Multi-threaded

Rust

Communication

Job description

Mozilla is a global leader in open source and web security. This role focuses on advancing Firefox's security architecture, cryptography, and browser reliability in a remote Sweden setting.

You will help design and ship security features and collaborate with engineers worldwide to strengthen the web platform. You will contribute to standards‑based implementations, work across multi‑language codebases, and explore Rust while advancing the security of a widely used browser.