Senior CI Automation Engineer at Mozilla

Remote US, Remote Canada, Remote Germany, Remote France, Remote UK

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The Company

A lot of companies say they’re “mission-driven”. Our unique corporate structure guarantees that every decision we make upholds our mission: to make sure the internet stays available, safe, and welcoming to everyone. Beholden to neither shareholders nor investors, Mozilla Corporation is wholly owned by the not-for-profit Mozilla Foundation.

Along with 20,000+ volunteer contributors and collaborators all over the world, Mozilla Corporation’s staff designs, builds, and distributes software that allows people to enjoy the internet on their own terms. Our flagship product — the Firefox browser — has expanded into a family of products that protects users and alerts them of risks.

The Opportunity

Have you ever wanted to make automation prevent regressions that would affect millions of users? At Mozilla, we run millions of Firefox tests for each commit to our master branch!

Our team takes these tests under their care by running them on modern operating systems, ensuring tools are up to date and have scalability, all while keeping an eye on the budget.

We also work with developers (our users) to set their new tests up at scale and ensure they are aware of what tests are providing value (identifying regressions) and hiding noise (flaky failures).

Last but not least, we maintain the harnesses that Firefox developers use every day to write and run their tests.

You will succeed in this role if you enjoy:

  • Thinking out of the box and turning new ideas into prototypes
  • Working with developers to collaborate and problem solve
  • Looking at lots of data and trends and making dashboards
  • Come up with innovative ideas to detect, debug and fix intermittent failures
  • Planning ahead, and following up when done


  • 2-3 years experience with Python
  • Comfortable with Windows, Linux, Mac, Android operating systems
  • Familiar with VCS (git or mercurial)
  • Familiar with testing/test harnesses
  • Experience with CI/CD and cloud
  • Comfortable with SQL queries and data analysis
  • Passion to learn new things and solve interesting problems
  • Fluent in English

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 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: D


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Applications are now closed