Build Engineer

Core Product-Firefox

We are Mozilla.

At Mozilla, our mission is to ensure the internet remains open and accessible to all. We are a mission-based, technology company.

Mozilla is a great place to work because of our mission, the quality and complexity of the work, and most importantly, the people who do the work. Come to Mozilla if you want to feel good about your work again.

Why Join?

Mozilla is a great place to work because of our mission, the quality and complexity of the work, and most importantly, the people who do the work. Come to Mozilla if you want to feel good about your work again.

About this role

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

Firefox developers land code every day to delight users with new features and improve product performance and security. The Engineering Workflow team is responsible in part for Firefox desktop's build system. Hundreds of Firefox developers run local builds every day. Our continuous integration farm runs over 12,000 build jobs a day. We are force-multipliers to enable Firefox developers to do their best work.

What You'll Get To Do

  • Work with a geographically-distributed development team
  • Implement build system improvements to support new and existing Firefox platforms
  • Be mentored by more senior team members
  • Collaborate with other teams by providing code review and technical direction 
  • Modernize tooling for faster build times to accelerate developer productivity

What You Bring

  • You’re pragmatic about how to move things forward in specific timeframes including trade-offs and safeguards when implementing new functionality
  • Be an excellent communicator and have participated effectively on a distributed team
  • You have a proven track record of finishing projects where the work spans several months 

Minimum Qualifications

  • Experience with compiled languages, executable formats, and related tools
  • A working knowledge of C/C++
  • Proficiency in a scripting language such as Python

Bonus points for

  • Experience working with legacy build systems such as make
  • Experience working with modern build systems such as Bazel, Buck or Blaze.
  • A working knowledge of Rust
  • Low level system experience on Linux, Windows, and/or Mac

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.

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