Senior Software Engineer (Firefox Security)

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

Benefits

Health and wellness: Mozilla covers medical, dental and vision plan premiums at 100% for U.S. and Canadian employees. Our offerings give you the options you need to manage your health — and your family’s — the way you want.

Mental health: Mental health is as important as our physical health. That’s why Mozilla’s health benefits include therapy and coaching sessions to make sure our people have access to the care they need.

Time away: With all of life’s demands, time away from work to disconnect and recharge is essential. In addition to country‑specific holidays (12 in the U.S. and Canada), vacation and sick time start accruing right away (specifics vary by country). Everyone also takes a pause together on quarterly all‑company wellness days, plus you get to celebrate the most personal holiday of all: your birthday.

Parental leave: While Mozilla’s parental leave policies vary globally, our U.S. and Canadian‑based employees can look forward to 26 weeks of paid leave for childbearing parents and 12 weeks of paid leave for non‑childbearing parents.

Financial: Mozilla is a private company, so our compensation isn’t tied to stock options or equity plans. Instead, we offer generous, performance‑based bonus plans to all regular employees to underscore that we share in our success as one team. As for retirement savings for US and Canadian employees, Mozilla contributes a percentage of your eligible base salary each year to the 401(k) Plan/RRSP (regardless of whether you contribute or not), with 100% vesting.

Learning and development: We’re big believers in learning by doing, and we also want to invest in your education and development beyond your role. Every employee is eligible for an annual professional development budget. Mozillians can put it toward technical or management training, certifications, conferences and more.

Help when you need it: Life is full of surprises; that’s why it’s important to be prepared. Mozilla provides Life/AD&D and Short and Long Term Disability insurance (offerings may vary by locale) to ensure that you and your family will have a safety net in place should you ever need it.

Plus a bit more: A few other benefits include a quarterly wellbeing stipend (to use on those things just for you), an employee referral bonus, internet reimbursement if you’re remote, and a budget for office essentials to make working remotely ergonomically comfortable.

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

Collaborative and effective communicator: Ability to work effectively with distributed teams, communicate technical concepts clearly, and collaborate constructively to solve problems

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 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

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

Web platform and modern systems experience: Familiarity with web technologies and interest or experience in Rust. Comfortable working within large, complex, multi‑language codebases

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