Senior Security Engineer - Mozilla

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. We are looking for a security engineer to own, manage and administer the Mozilla Web Bug Bounty program and work 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.