Mozilla · 2 days ago
Senior Security Engineer, Add-ons Operations
United States
Full-time
Remote
Senior LevelMozilla Corporation is a non-profit-backed technology company that has shaped the internet for the better over the last 25 years. As a Senior Security Engineer, you will work on enhancing the Add-ons ecosystem by delivering major features, improving platform reliability, and ensuring security and user trust.
Telecom & CommunicationsSoftwareBrowser ExtensionsInternetOpen SourceWeb Browsers
Responsibilities
Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub
Create robust observability systems and data-backed insights
Provide peer feedback, share knowledge and help others grow
Improve platform reliability through deployments, monitoring, and incident response
Help keep the platform safe and trustworthy, with attention to security and user trust
Step in to resolve issues impacting users and developers, from small bugs to larger incidents
Collaborate with designers, product managers, QA, and community contributors to deliver end-to-end improvements
Contribute in the open through pull requests, code reviews, and discussions
Qualification
Required
Experience building modern web applications
Strong experience with Python/Django or similar backend frameworks
Understanding of web security principles and practices
Strong collaboration and communication skills in a distributed team environment
Adept at navigating ambiguity, exploring solutions, and shaping direction in new problem spaces
Preferred
Experience in building automated security systems
Exposure to cloud infrastructure (Google Cloud or similar)
Contributions to open source projects
Experience with policy-compliant ecosystem moderation tools
Benefits
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)
Company
Mozilla
Mozilla provides internet solutions and offers firefox, thunderbird, and raindrop.
Founded in 1998
501-1000 employees
H1B Sponsorship
Mozilla has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (2)
2024 (5)
2023 (4)
2022 (3)
2021 (2)
2020 (6)
Funding
Current Stage
Late StageTotal Funding
$2.3MKey Investors
AOL
2005-01-01Angel· $0.3M
2003-07-15Series Unknown· $2M
Leadership Team
John Shaughnessy
Manager, Engineering and Ecosystem Strategy
Recent News
2026-02-09
Help Net Security
2026-02-08
Company data provided by crunchbase