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Senior Software Engineer, Firefox Security

3 hours ago
United Kingdom
Full-time
Senior
Software Engineer
Software Development
Rust
Apply Now
Mozilla

Mozilla

Mozilla, the maker of Firefox, is a non-profit organization ensuring an open, safe, and accessible internet for all users worldwide.

Internet Software & Services
251-1K
Founded 2005
$2M raised
View All Jobs 48

Description

  • Advance Firefox’s security architecture and cryptography stack, with a focus on cryptographic protocols, WebPKI, and security-sensitive web APIs.
  • Design and implement web platform security features in collaboration with teammates and the broader web community.
  • Develop and ship standards-based, secure, and interoperable implementations across Firefox.
  • Investigate and resolve issues affecting browser stability, correctness, performance, memory usage, and resource efficiency.
  • Partner with engineers across teams to identify, prioritize, and address security issues.
  • Participate in debugging, root cause analysis, and the implementation of long-term solutions.
  • Contribute to technical discussions, design reviews, and project planning for security-related initiatives.
  • Evaluate tradeoffs and help inform engineering decisions within your area of work.

Requirements

  • Proficiency in C/C++ and strong software engineering fundamentals.
  • Solid understanding of security principles, including cryptographic protocols and implementations.
  • Experience contributing to the design, implementation, testing, and maintenance of complex software systems.
  • Experience diagnosing and resolving issues in multi-threaded, cross-platform native applications.
  • Strong debugging and problem-solving skills for performance and memory-related challenges.
  • Ability to work effectively with distributed teams and communicate technical concepts clearly.
  • Curiosity and willingness to deepen expertise in browser security, cryptography, and systems programming.
  • Familiarity with web technologies and interest or experience in Rust.
  • Comfort working within large, complex, multi-language codebases.

Benefits

  • £66,000–£87,000 GBP remote UK salary range.
  • Generous performance-based bonus plans for eligible employees.
  • Rich medical, dental, and vision coverage.
  • Generous retirement contributions with 100% immediate vesting.
  • Quarterly all-company wellness days.
  • Country-specific holidays plus a day off for your birthday.
  • One-time home office stipend.
  • Annual professional development budget.
  • Quarterly well-being stipend.
  • Considerable paid parental leave.
  • Employee referral bonus program.
  • Additional benefits such as life/AD&D, disability, and EAP coverage, depending on country.

Interested in this position?

Apply directly on the company website

Apply Now

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