Mozilla

Senior Software Engineer, Cryptography (Firefox Security)

Mozilla • $104K — $139K *
US-AnywhereRemote in Canada
Information Technology
Less than 5 years of experience
Today
Be an Early Applicant
Job Overview by Ladders

Qualifications

  • Strong software engineering and security fundamentals with proficiency in C/C++ and cryptography.
  • Experience in building and maintaining complex software systems in security-sensitive environments.
  • Expert debugging and problem-solving skills for multi-threaded, cross-platform applications.
  • Collaborative communicator with experience in distributed teams.
  • Growth mindset with a willingness to learn about browser security and systems programming.
  • Familiarity with web technologies and interest in Rust.

Responsibilities

  • Advance Firefox's security architecture and cryptography stack.
  • Design and implement web platform security features in collaboration with teams.
  • Improve browser reliability and performance by resolving stability issues.
  • Collaborate on security initiatives to address and solve security challenges.
  • Contribute to technical design and planning for security-related projects.

Benefits

  • Generous performance-based bonus plans for all eligible employees
  • Rich medical, dental, and vision coverage
  • Generous retirement contributions with immediate vesting
  • Quarterly all-company wellness days
  • Country specific holidays and 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 varying by country
Full Job Description
What you'll do:
  • Advance Firefox's security architecture and cryptography stack: Contribute to improvements in Firefox's core security systems, with a focus on cryptographic protocols, WebPKI, and security-sensitive web APIs. Help implement and maintain security features that support the evolution of public key infrastructure on the web.
  • Design and implement web platform security features: Develop and ship web platform features in collaboration with teammates and the broader web community. Contribute to standards-based, secure, and interoperable implementations across Firefox.
  • Improve browser reliability, performance, and resource efficiency: Investigate and resolve issues impacting stability, correctness, and performance. Analyze and improve memory usage and efficiency within a complex, multi-threaded browser environment.
  • Collaborate on security initiatives: Partner with engineers across teams to identify, prioritize, and address security issues. Participate in debugging, root cause analysis, and implementation of effective long-term solutions.
  • Contribute to technical design and planning: Participate in technical discussions, design reviews, and project planning for security-related initiatives. Help evaluate tradeoffs and contribute to engineering decisions within your area of work.

What you'll bring:
  • Strong software engineering and security fundamentals: Experience in software engineering, with proficiency in C/C++ and a solid understanding of security principles, including cryptographic protocols and implementations.
  • Experience building and maintaining complex software systems: Ability to contribute to the design, implementation, testing, and maintenance of software in large-scale or security-sensitive environments.
  • Strong debugging and problem-solving skills: Expertise in diagnosing and resolving issues in multi-threaded, cross-platform native applications, including performance and memory-related challenges.
  • Collaborative and effective communicator: Ability to work effectively with distributed teams, communicate technical concepts clearly, and collaborate constructively to solve problems.
  • Growth mindset and willingness to learn: Demonstrated curiosity and desire to deepen expertise in browser security, cryptography, and systems programming while continuously improving engineering skills.
  • Web platform and modern systems experience: Familiarity with web technologies and interest or experience in Rust. Comfortable working within large, complex, multi-language codebases.

What you'll get:
  • Generous performance-based bonus plans to all eligible employees - we share in our success as one team
  • Rich medical, dental, and vision coverage
  • Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
  • Quarterly all-company wellness days where everyone takes a pause together
  • 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
  • Other benefits (life/AD&D, disability, EAP, etc. - varies by country)

Hiring Ranges:

Canada Tier 1 Locations

$104,000-$139,000 CAD

Canada Tier 2 Locations

$95,000-$126,000 CAD

About Mozilla

Mozilla is a global community of technologists, thinkers, and builders working together to keep the internet open and accessible to all. The company is best known for its flagship product, the Firefox web browser, which is used by millions of people around the world. In addition to its browser, Mozilla also develops a range of other products and services, including a mobile operating system, a password manager, and a virtual private network (VPN) service.
Learn more about Mozilla
Size
1,000 employees
Industry
Enterprise Technology
Founded
1998
* Ladders Estimates

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