About This Team And Role

At Mozilla, we believe the internet is a global public resource—open and accessible to all. As a Security Engineer, you’ll protect that vision by building, breaking, and hardening products that put people’s privacy and safety first. The role involves owning, managing, and administering the Mozilla Web Bug Bounty program and working with Mozilla product and SIRT teams to ensure risk mitigation of security incidents and events.

What You’ll Do

- Own and scale Mozilla’s web bug bounty program, including strategy, prioritization, KPIs, and continuous improvement
- Act as the primary interface with external researchers and platforms (e.g., HackerOne), fostering a high‑quality and trusted research community
- Lead triage and technical validation of incoming reports across multiple intake channels (HackerOne, Bugzilla, email)
- Drive end‑to‑end vulnerability remediation, partnering with engineering teams to ensure timely, effective fixes
- Identify root causes and systemic issues, and influence long‑term improvements in secure development practices
- Collaborate with the Security Incident Response Team (SIRT) on active incidents and post‑incident reviews
- Perform targeted code reviews (primarily JavaScript and Python) during investigations and high‑risk changes
- Develop or leverage tooling to improve triage efficiency, signal quality, and program insights

What You’ll Bring

- 3+ years of demonstrated ability in a security engineering role.
- Experience operating bug bounty programs, including enhancements, automation and scaling, and/or bug hunting
- Practical experience working with modern cloud technologies (eg. Amazon Web Services,



Google Cloud Platform, Heroku, Microsoft Azure, etc.)
- Experience analyzing code and systems to move from vulnerability → root cause → prevention
- Real‑world experience in software development and/or engineering operations
- Ability to develop your own tools as needed in a variety of programming languages (eg. Python, Go, Rust, Javascript, etc.) is a plus, but not required.
- Strong communication, collaboration, and problem‑solving skills, with the ability to influence and guide cross‑functional teams.
- Formal credentials are great, but real‑world experience, curiosity, passion and a growth mindset matter more.

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 career 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)





Commitment to diversity, equity, inclusion, and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity‑seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at [email protected] to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Hiring Ranges

- Canada Tier 1 Locations: $104,000—$139,000 CAD
- Canada Tier 2 Locations: $95,000—$126,000 CAD

📌 Senior Security Engineer, Bug Bounty (Toronto)
🏢 Mozilla
📍 Toronto