Staff Software Engineer - DOM Core

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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, and Pocket, a service for keeping up with the best content online. 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:

Join the global DOM: Core team of engineers passionate about the Web.  We are the team responsible for HTML elements, document model, page navigation, user interaction, and text editing in Gecko, the engine that powers Firefox. Our responsibilities include implementing and improving key web specifications such as DOM, HTML, UI Events, Clipboard APIs, Selection API, among others. We push the boundaries of what the Web is capable of. We are thrilled to enable Web developers to create modern custom user interfaces in a standardized way.

In this role, you’ll be instrumental in the continued advancement of Gecko and the Web platform at large. Opportunities to collaborate with the broad Firefox  team and other browser teams abound. You will implement standardized APIs . You will influence Web feature design. Your responsibilities will include writing code, tests, specifications as well as building prototypes and solving problems, while continuously learning and growing as a technical leader.

Are you deeply committed to the open Web? Are you excited about the open UI? If so, we’d love to hear from you!

What you’ll do: 

• Improve the DOM, HTML, editing, user interaction capabilities of our Web engine, with a focus on performance, security, interoperability and accessibility

• Read and implement API specifications, as well as contributing to the standards process by participating in or driving discussions with the Web community

• Develop and debug in a large complex code base

• Investigate and propose solutions and architectural changes 

• Drive features and projects from start to completion

• Collaborate with the widespread Firefox team on shared goals

What you’ll bring: 

• Proficient with C++

• Skills to learn a large and complex codebase in a timely manner

• Strong ability to write maintainable software in a multi-language and multi-process codebase, ensuring robustness when changes are made

• Experience working on performance-critical system software

• Good understanding of web technologies (JavaScript, HTML, and CSS), and comfortable navigating their specifications, centering around enhancing user experience, privacy and performance

• Creative problem-solver and proficient debugger and profiler

• Great written communication skills and ability to lead discussions effectively, both in writing and verbally.

• Commitment to our values:

  • Welcoming differences

  • Being relationship-minded

  • Practicing responsible participation

  • Having grit

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 

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.  We’re not a normal tech company. The things we create prioritize people and their privacy over profits. We exist to make the internet a healthier,  happier place for everyone.

Commitment to diversity, equity and inclusion

Mozilla believes in the value of diverse creative practices and forms of knowledge, and knows diversity, equity and inclusion 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 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

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Req ID: R2701