Senior Security Engineer, Add-ons Operations

Mozilla

About The Position

addons.mozilla.org (AMO) is the foundation of the Firefox add-ons ecosystem. It’s a showcase for developers to publish and grow their extensions, and a place of discovery for millions of users who customize Firefox to make it their own. Behind the scenes are the DevHub which enables developers to manage their extensions. To manage the ecosystem there are a series of Reviewer tools and automated moderation systems. As a Senior Software Engineer - Operations, you’ll bring a passion for crafting resilient systems that accelerate our review and operations team to provide a first-class experience for Add-on developers. You’ll work closely with engineers, reviewers, developer relations, and Add-ons leadership to turn ideas into polished features, modernize the platform and its architecture, and see your work reach millions of people around the world.

Requirements

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.

Nice To Haves

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.

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.

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)