Senior Software Engineer - Engineering Workflow and CI

Join to apply for the Senior Software Engineer – Engineering Workflow and CI role at Mozilla.

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: Firefox developers land code every day to delight users with new features and improve product performance and security. Every day, developers and managers use our team’s applications to develop, build, test, and deliver Mozilla’s core products. We are force‑multipliers to enable Firefox developers to do their best work.

What You’ll Do:

• Improve Firefox development workflows to reduce time spent testing and debugging test failures as well as more integration/automation of workflows.
• Work with a geographically-distributed development team.
• Mentor other team members and be mentored by more senior team members.
• Collaborate with other teams by providing code review and technical direction.
• Look at data, make dashboards, identify trends in Firefox development workflow.

What You’ll Bring:

• Proven Python skills, including building services.
• Front‑end development experience, including JavaScript proficiency.
• Experience with Python frameworks (e.g., FastAPI, Flask, Django), Cloud Services (e.g., GCP, AWS) and REST.
• Solid understanding of databases and SQL.
• Experience with CI/CD systems (e.g., GitHub Actions, CircleCI) and test harnesses.
• Comfortable working cross‑platform, familiar with at least 2 of: Windows, Linux, Mac, Android.
• A passion for enhancing developer productivity.
• Commitment to our values: Welcoming differences, Being relationship‑minded, Practicing responsible participation, Having grit.

Bonus Points For:

• A deep understanding of version control systems.
• Experience with containerization and continuous delivery/deployment, particularly with Docker.
• Experience with CI of large scale projects.
• Comfortable with data analysis.

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. 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.

Hiring Ranges: Remote UK: £65,000—£95,000 GBP

Job Details: Seniority level: Associate, Employment type: Full‑time, Job function: Engineering and Information Technology, Industries: Software Development.