Suggested rewrite: Led a cross-functional initiative that improved [business outcome] by [measurable result], demonstrating experience relevant to this role...
Staff Software Engineer, Firefox Enterprise
- Remote from
- Germany
- Salary
- EUR 81k–108k / yr
- Department
- Software Engineering
- Employment
- Full Time
- Experience
- Senior
- Published
- Apply before
- 4 Dec 2026
- Listing views
- 22
- Application actions
- 0
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About this role.
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. Now, with more than 225 million people around the world 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 focuses on diverse areas including AI, social media, security and more. And we’re 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:
The Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well! The Enterprise team is a cross-disciplinary team in charge of improving and maintaining Firefox support for large Enterprise deployments. As part of the team, you will be responsible for all things related to services and infrastructure for our Enterprise products.
A Staff Software Engineer is the next level up from a Senior Software Engineer. At Mozilla this role can vary, but typically a staff engineer supports an engineering team, providing technical leadership, building cross-team relationships, and helping the team deliver on their objectives.
What You’ll Do:
- Improve the ease of use and security of Firefox in large deployments by developing better administration and monitoring tools.
- Improve Firefox functionality by better integration with remote services.
- Assess what work supports the team and product roadmap and make insightful recommendations in regards to priorities.
- Work with a geographically-distributed development team.
What You’ll Bring:
- 8+ years of professional experience in software development.
- Experience developing robust services according to modern best practices.
- Strong software engineering fundamentals: modularity, abstraction, data structures, and algorithms.
- Proficiency in Rust and JavaScript.
- Proven understanding of database systems (SQL and/or non-relational databases).
- You are an excellent communicator and have participated effectively on a distributed team.
- You’re pragmatic about how to move things forward in specific timeframes including trade-offs and safeguards when implementing new functionality.
- Curiosity and interest in learning new things.
- Commitment to our values:
- Welcoming differences
- Being relationship-minded
- Practicing responsible participation
- Having grit
Bonus Points
- Front-end development experience.
- Experience with kubernetes.
- Experience with OIDC/OAuth2.
- You have previously successfully contributed to an open source project.
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)
We value a variety of voices within our team and at Mozilla. You don’t need to check every box on this list to apply.
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. Please contact us at hiringaccommodation@mozilla.com to request accommodation.
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.
Group: C
#LI-REMOTE
Req ID: R3218
Hiring Ranges:
Remote Germany
€81.000—€108.000 EUR
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Sample interview questions
I would begin by clarifying policy models, tenant isolation, authentication, auditability, scale, and failure modes. I would design a versioned API and data model, use strong authorization controls such as OIDC/OAuth2, make policy delivery observable, and ensure clients can safely use cached configurations during service outages.
I would explain the available options, risks, and constraints, then identify the smallest safe implementation that met the immediate need. I would add safeguards such as feature flags, validation, monitoring, staged rollout, and a documented plan for follow-up hardening.
I use Rust where memory safety, predictable performance, concurrency, or systems-level integration are central requirements. I use JavaScript when rapid iteration, web-facing integrations, or an existing JavaScript ecosystem provides a clear delivery advantage, while keeping interfaces and operational standards consistent.
I make architecture and decision criteria visible, delegate ownership clearly, and use concise design reviews to unblock teams early. I focus on mentoring, aligning stakeholders, and improving engineering practices so that others can make high-quality decisions independently.
I would first assess user impact and stabilize the system through rollback, feature-flag disablement, or graceful degradation if necessary. I would then use logs, metrics, traces, and affected-client segmentation to identify the failure pattern, communicate status clearly, implement a tested fix, and document preventive actions.
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