Mozilla
Senior Security Engineer, Add-ons Operations
How your CV stacks up
Upload your CV to see how well it fits this job role
?%
Senior Security Engineer, Add-ons Operations
Senior Software Engineer - Operations (Add-ons Team)
Why Mozilla?
Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. With more than 225 million people using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies.
Our work spans diverse areas including AI, social media, security, and more—all while staying true to our core mission: to make the internet better for people.
The Mozilla Corporation is fully owned by the non-profit 501(c)(3) Mozilla Foundation. This means we’re not constrained by shareholder interests—only our mission. Along with thousands of global volunteer contributors, Mozillians design, build, and distribute open-source software that empowers people to enjoy the internet on their own terms.
About This Team & Role
addons.mozilla.org (AMO) is the cornerstone of Firefox’s add-ons ecosystem, serving as a developer hub for publishing and growing browser extensions while offering millions of users a way to customize Firefox. Key components behind the ecosystem include:
- DevHub: A toolset for developers to manage their extensions.
- Reviewer tools & automated moderation systems: Supporting seamless operation and efficiency.
As a Senior Software Engineer – Operations, you’ll drive the development of resilient systems that accelerate our review and operational teams’ ability to deliver an exceptional experience for add-on developers. You’ll collaborate with engineers, reviewers, developer relations, and leadership to:
- Turn ideas into impactful features
- Modernize the platform architecture
- Ensure your work touches millions globally
What You’ll Do
-
Feature & Architecture Development:
- Lead major features and improvements across the add-ons stack, including:
- Automated moderation pipelines
- Reviewer tools
- DevHub
- Refine-dev tooling to enhance developer experiences
- Lead major features and improvements across the add-ons stack, including:
-
Observability & Data-Driven Insights:
- Build robust observability systems and provide data-backed insights into platform performance and ecosystem health.
Reasons to use Rodeo
Start with a chat, not a search bar
Grad scheme, placement, apprenticeship? Not sure what you want yet — that's fine. Your agent talks it through with you and turns "I have no idea" into a shortlist.
It searches the market for you
Every day your agent scans the market matching roles against what actually matters to you, not just keywords on a CV.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
-
Peer Mentorship & Knowledge Sharing:
- Share expertise, offer peer feedback, and help others grow as engineers.
-
SRE & Incident Response:
- Improve platform reliability through:
- Deployment optimizations
- Monitoring systems
- Incident response
- Proactively support security and user trust by addressing policy compliance and abuse reports.
- Improve platform reliability through:
-
Escalation & Triaging:
- Resolve technical issues for users and developers, from small fixes to major system-level incidents.
-
Cross-Functional Collaboration:
- Work closely with:
- Designers
- Product Managers
- QA Teams
- Community Contributors
- Work closely with:
-
Open Source Contributions:
- Deploy improvements in the open via pull requests, code reviews, and discussions, inviting collaboration from Mozillians and community members alike.
Key Tech Stack & Areas Of Focus
- Frontend: React and TypeScript
- Backend: Django
- Databases: MySQL
- Cloud Infrastructure: Google Cloud deployments, monitoring, and incident response
- Feature Development:
- Improve submission flows
- Enhance trust and safety signals
- Modernize DevHub and Reviewer tools
- Ecosystem Moderation:
- Abuse report management
- Policy compliance and trust systems
What You’ll Bring
Core Requirements
- Experience building modern web applications
- Proficiency with Python and Django, or related frameworks (e.g., Flask)
- Strong understanding of web security principles (OWASP Top 10, secure auth/z flows)
- Collaboration expertise in cross-team distributed environments
- Ability to thrive in ambiguity, exploring and refining direction for new problems
Mozilla Values Alignment
Embodiment of our corporate values of:
- Welcoming differences
- Being relationship-minded
- Practicing responsible participation
- Demonstrating grit
Bonus Points For
- Security automation experience (e.g., static code analysis, vulnerability management)
- Cloud infrastructure expertise (Google Cloud Platform or AWS)
- Open-source contributions (GitHub, GitLab, code reviews)
- Prior work with policy-compliant moderation tools
What You’ll Get
Mozilla investing in your future and personal well-being:
Get help with your application
Your very own career expert that helps elevate your application to the next level.
✔ Performance-based bonuses — Empowering team success-driven rewards ✔ Comprehensive benefits:
- Rich medical, dental, and vision coverage
- Generous retirement contributions with full (100%) immediate vesting
- Categorized as a definitive primary employer plan, never subject to forfeiture ✔ Work-life balance benefits:
- Quarterly all-company wellness days
- Country-specific holidays plus one day for your birthday
- One-time home office stipend ✔ Continuous professional growth:
- Comprehensive developments budget
- Quarterly well-being stipend ✔ Family-first benefits:
- Considerable paid parental leave ✔ Referral rewards & other perks:
- Employee referral bonus program
- Further life-long benefits (e.g., life/accident, disability, employees assistance programs) varying by location
About Mozilla
We exist to ensure the Internet remains a public resource accessible to all—because open trumps closed.
When you join Mozilla, you’re not just working on the Web as a platform, you join a movement to foster opportunity and innovation for everyone online. Here, you’ll daily make a difference—in your life, yours of others, and yours the millions shaping the open web.
Diversity, Equity & Belonging
Mozilla champions diverse creative practices and knowledge forms as critical to mission success.
We inspire applications from all groups—especially women, racialized/Indigenous people, persons with disabilities, and LGBTQ+ individuals—because diverse talent helps build a better internet.
Reasonable accommodations for applicants with disabilities? Reach out to accommodation.request@mozilla.com.
Mozilla is an equal opportunity employer. Silence discrimination or harassment based on any protected characteristic—including religion, age, disability status, international non-U.S. associates, motor vehicles, civil service records, genetic information, or any other consideration under law.
Group: Digital (Note: Job is fully remote with an international team) #LI-REMOTE Req ID: R3023 |
Location & Salary Range
Remote | £65,000—£87,000 GBP (base salary)
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
Skills
Location