At a Glance
- Tasks: Craft resilient systems and deliver major features for the Firefox add-ons ecosystem.
- Company: Join Mozilla, a non-profit tech company shaping the internet for over 25 years.
- Benefits: Enjoy generous bonuses, rich health coverage, and professional development budgets.
- Other info: Diverse and inclusive workplace committed to making the internet better for everyone.
- Why this job: Make a real impact on millions of users while working with cutting-edge technology.
- Qualifications: Experience in web applications, Python/Django, and strong collaboration skills required.
The predicted salary is between 36000 - 60000 £ per year.
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. Now, with more than 225 million people around the world using our products each month, we are shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we are doing this while never losing our focus on our core mission – to make the internet better for people.
The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.
About this team and role: 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.
What you’ll do:
- 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.
Work on:
- Full stack development: React/TypeScript frontends, Django backend, MySQL datastore.
- Platform reliability: deployments, monitoring, and incident response on Google Cloud.
- Feature development: submission flows, trust and safety signals, DevHub and Reviewer tools modernization.
- Ecosystem moderation: abuse report management, policy compliance, and ecosystem safety.
- Open collaboration: We work in the open, with contributions from Mozilla staff and community members.
What you’ll bring:
- 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.
- Commitment to our values: Welcoming differences, Being relationship-minded, Practicing responsible participation, Having grit.
Bonus points for:
- 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.
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 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).
About Mozilla: Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.
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.
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.
Senior Security Engineer, Add-ons Operations employer: Mozilla
At Mozilla Foundation, we pride ourselves on being a people-first employer that champions creativity and innovation in technology. Our remote work culture fosters autonomy and collaboration, allowing you to thrive while contributing to meaningful projects that shape the future of technology governance. With a commitment to employee growth and a focus on impactful global engagements, joining our team means being part of a mission-driven organisation that values your insights and expertise.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Security Engineer, Add-ons Operations
✨Tip Number 1
Network like a pro! Reach out to current Mozillians on LinkedIn or other platforms. Ask them about their experiences and share your passion for making the internet better. You never know who might put in a good word for you!
✨Tip Number 2
Show off your skills! If you’ve got a GitHub or portfolio, make sure it’s up to date with your best work. Highlight projects that align with Mozilla's mission and values. This is your chance to shine and demonstrate your expertise!
✨Tip Number 3
Prepare for the interview by diving deep into Mozilla’s products and values. Familiarise yourself with their add-ons ecosystem and think of ways you could contribute. Bring your ideas to the table – they love innovative thinkers!
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen. Plus, it shows you’re serious about joining the Mozilla team. Let’s make the internet a better place together!
We think you need these skills to ace Senior Security Engineer, Add-ons Operations
Some tips for your application 🫡
Show Your Passion:When writing your application, let your enthusiasm for technology and the internet shine through. We want to see how your passion aligns with our mission to make the internet better for everyone.
Tailor Your Experience:Make sure to highlight your relevant experience in building modern web applications and working with Python/Django. We love seeing how your skills can contribute to our Add-ons ecosystem!
Be Authentic:Don’t be afraid to show your personality! We value authenticity and want to get to know the real you. Share your unique perspective and experiences that make you a great fit for our team.
Apply Through Our Website:For the best chance of success, apply directly through our website. It’s the easiest way for us to review your application and get you on the path to joining our amazing team!
How to prepare for a job interview at Mozilla
✨Know Your Tech Stack
Make sure you’re well-versed in the technologies mentioned in the job description, like Python/Django and React/TypeScript. Brush up on your knowledge of web security principles too, as this role heavily focuses on keeping the platform safe and trustworthy.
✨Showcase Your Collaboration Skills
Since this position involves working closely with various teams, be prepared to discuss your past experiences in collaborative environments. Share specific examples of how you’ve effectively communicated and worked with others to achieve common goals.
✨Prepare for Problem-Solving Questions
Expect questions that assess your ability to navigate ambiguity and explore solutions. Think of scenarios where you faced challenges in your previous roles and how you shaped direction in new problem spaces. This will demonstrate your critical thinking skills.
✨Align with Mozilla's Values
Familiarise yourself with Mozilla’s core values and be ready to discuss how you embody them. Whether it’s being relationship-minded or practising responsible participation, showing that you resonate with their mission can set you apart from other candidates.
