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Mozilla // non-profit building internet software
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The Role

The DOM: Core team at Mozilla cares deeply about Firefoxs high-performing Web rendering engine, Gecko. We aim for intelligent hardware utilization, excellent user interaction, continuous architecture hardening, & Web compatibility. We push the boundaries of what the Web is capable of. We do this by delivering outstanding implementations in Firefox of the standardized APIs, such as DOM,  HTML, Events, Editor, Clipboard and so on. Web developers whose work is rendered by Gecko rely on these implementations for building modern Web experiences. Firefox itself also uses these technologies! The team works together to enhance our existing implementations & with the broader Web community to advance the capabilities of these standardized APIs.

Do you love the challenges of debugging large, complex C++ code?  Do you have a strong interest in continuing to enhance your abilities in software development? Do you feel excited about improving the user experience of the Firefox product so that millions of users benefit? If so, wed like to hear from you!

What you'll do

  • Write C++ code. While we write tests largely with HTML & JavaScript, learn on the job.

  • Develop & debug in a multi-language, multi-threaded & multi-process code base.

  • Improve the user experience for Firefox users who use various OSes or speak different languages.

  • Read & review API specifications. We build & design APIs.

  • Work collaboratively with other Firefox teams, other browser vendors & a worldwide community. Working in the open is the norm.

What you bring

  • Capability as a C++ programmer.

  • Motivation to learn new tools & techniques for improving existing software.

  • Ability to learn a large & complex code base quickly.

  • Familiarity with one or more of the following, or ability to pick them up in a timely manner:

    • Multi-process architecture.

    • Debugging & memory usage or performance profiling.

    • The modern Web technologies (JavaScript, HTML, and/or CSS) .

Possible interests

  • Participating in an internet standards body such as the WHATWG & W3C.

About Mozilla 

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open & free is better than closed & 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 & help create more opportunity & innovation for everyone online.

Commitment to diversity, equity, inclusion, & belonging

Mozilla understands that valuing diverse creative practices & forms of knowledge are crucial to & enrich the companys core mission.  We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized & Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, & 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, & to receive other benefits & 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 & texture), religion (including religious grooming & 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: E


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