Senior Software Engineer, Accessibility
at Mozilla Corporation
Core Product-Firefox
Remote US, Remote Canada

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

  • Mozilla is committed to ensuring the Web is a global, public resource accessible to all. Ensuring that Firefox and other Mozilla products are accessible to people with disabilities is thus a fundamental part of this mission.
  • The Mozilla Corporation is looking for a skilled developer to work with our talented accessibility team to help drive web accessibility forward! This is a small, enthusiastic team that affects the lives of users every day that's looking for you to contribute to the accessibility of Firefox and other Mozilla products. 
  • Using your front-end and accessibility expertise, you will shape Mozilla’s efforts to ensure that Firefox is delightfully accessible to people with disabilities.

What You'll Get To Do

  • Contribute front-end code to ensure that product features and common UI components are accessible and inclusive.
  • Collaborate with design and front-end teams to identify potential accessibility issues and drive resolutions.
  • Improve automated testing frameworks and seek other automation opportunities to detect accessibility issues before they land.
  • Maintain the Firefox Accessibility Developer Tools.
  • Build excellent working relationships with engineers on other teams.
  • Work in the open as part of the Mozilla open source project and engage with Mozilla’s global community.


  • A degree or equivalent in Computer Science or a related field.
  • Understanding of accessibility and inclusive design.
  • Advanced skills in HTML, CSS and JavaScript.
  • Comfortable working on a large, mature code-base.
  • Excellent written and verbal English communication skills.
  • Ability to effectively participate as part of a geographically-distributed open development team.
  • A passion to empower and improve the web for people with a diverse range of abilities.

Bonus points for

  • Familiarity with React.
  • Experience with iOS and Android UI development.
  • Experience in C++ development.
  • Experience in working with standards body working groups.
  • Knowledge of ARIA and other web accessibility technology.

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


Why Mozilla?

At Mozilla, we’re serving humanity—by maintaining a safe, open internet—while also helping the individual humans employed here to reach their personal and professional goals. With a relatively small team serving hundreds of millions of people, a culture of exploration, and a commitment to mentorship, opportunities abound to learn and grow at Mozilla.

Our values drive our actions

  • Purpose is built into our work, with our mission driving every decision
  • We challenge assumptions, the status quo, ourselves, and each other
  • We are transparent: in our code, our business partnerships, and our everyday interactions
  • We seek out people from diverse backgrounds and with perspectives different from our own
  • We pair purpose with performance and put people ahead of profit

Our impact is global

  • 700+ paid staff from over 30 countries
  • Thousands of volunteer contributors across six continents
  • 9 global offices: Mountain View, San Francisco, Portland, Vancouver, Toronto, Paris, London, Berlin, and Beijing
  • Hundreds of home offices globally

Our benefits are world-class

  • Flexible work environment (nearly half of Mozillians work remotely)
  • Industry-leading paid parental leave (up to 26 weeks of fully paid leave for childbearing parents and up to 12 weeks for non-childbearing parents)
  • Reimbursement for professional development (up to $3,000/year)
  • A work setup including the latest hardware and software of your choice