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Senior Software Engineer, Accessibility

Mozilla Corporation


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

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