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Senior Software Engineer, Accessibility - Mozilla - Remote - Global

Software Engineer

Posted: July 18, 2026
Posted today
Last seen in crawl: July 18, 2026 (1d ago)
Estimated Expiry: August 22, 2026
Remoteness
Role & Management
Role Level:Mid-Level
Job Type
Required Languages

Job Description

Mozilla is hiring a Senior Software Engineer, Accessibility in Remote Canada, Firefox, New Products, Firefox, Core Services, Firefox, Mozilla Foundation, Core Services. At Mozilla, accessibility (or a11y for short) is an integral part of our mission to ensure the internet is "open and accessible to all," helping to empower people, regardless of their abilities, to contribute to the common good. To that end, the Accessibility Team maintains the Firefox accessibility engine used by assistive technology software, as well as other accessibility specific features such as high contrast mode support. In addition, the team seeks to guide and educate design and product teams in crafting accessible Mozilla products or features. This supports Mozilla's ambition of creating a joyful internet for all. The Mozilla Corporation is looking for a skilled developer to work with our passionate Accessibility Team to make the web fully accessible! This is a small, hard-working team that affects the lives of users every day. Using your C++ and systems programming expertise, you will contribute to the core Gecko web rendering engine across various operating systems, shaping Mozilla’s efforts to take Firefox accessibility to the next level. Opportunities to collaborate with other browser teams abound, and working in the open is the norm. You’ll be responsible for writing code, tests, specifications, building prototypes, solving problems, and analyzing data. You'll get feedback from real users and synthesize it into bug reports, feature designs, and strategic direction to make the web platform even better over time. What You’ll Do: Improve the architecture, stability, correctness and performance of the core Gecko accessibility engine. Debug and fix problems in our multi-process, multi-threaded codebase. Debug OS specific issues. Build excellent working relationships with engineers and organizational leaders on other teams. Collaborate with design and front-end teams to identify, assess, and remediate accessibility issues. Influence web standards that provide or improve access to new web technology. Work in the open as part of the Mozilla open source project and engage with Mozilla’s global community. Work on infrastructure to expose the web platform to accessibility technology. Meet standards for gecko's memory usage and performance. Implement new web features to enable new kinds of applications and content types. What you'll bring: A degree or equivalent in Computer Science or a related field. Demonstrated proficiency with C++. Knowledge of web accessibility and ARIA. Knowledge of Javascript, the web, and web applications. Experience working on cross-platform native applications. Creative problem-solving and debugging skills. Experience writing and debugging multi-process, multi-threaded code. Ability to learn a large and complex multi-language 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. 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 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 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.

Company Information

Current open roles at Mozilla on JobCrawls
LocationActive listings
Remote Finland46
Remote Germany44
Remote Netherlands43
Remote UK42
Remote France41
Remote Belgium41
Remote Spain40
Remote Sweden38
Remote Poland35
Remote Canada32
Remote US19
Remote - Global15
Remote - France6
Remote - Netherlands6
Remote - Spain6
Remote - Germany6
Remote - Sweden6
Remote - Belgium6
Remote - Poland6
Remote - Finland6
Remote Denmark6
Remote Australia5
Remote New Zealand5
Remote - Canada5
Remote - UK5
Remote - US2
Current role mix at Mozilla on JobCrawls
Role typeActive listings
Software Engineer51
Product Manager2
Localization Technical Program Manager2
Application Engineer1
Senior Software Engineer1
Product Director1
Engineer1
Quantitative User Researcher1
Fundraising Strategist1
Social Media & Content Strategist1
Head of Global and Strategic Intelligence1
Data Scientist1
Security Engineer1
Machine Learning Engineer1
Grassroots Engagement Director1
Current role-level mix at Mozilla on JobCrawls
Role levelActive listings
Mid-Level17
Senior10
Mid-level1

Mozilla appears in 512 indexed job postings in JobCrawls' Finland dataset since October 2023. In that historical index, the strongest location signals for this employer are Remote Finland, Remote Germany, and Remote Netherlands.

Data shown is based on historical job postings from our database.

Job Details

Requirements

  • A degree or equivalent in Computer Science or a related field.
  • Demonstrated proficiency with C++.
  • Knowledge of web accessibility and ARIA.
  • Knowledge of Javascript, the web, and web applications.
  • Experience working on cross-platform native applications.
  • Creative problem-solving and debugging skills.
  • Experience writing and debugging multi-process, multi-threaded code.
  • Ability to learn a large and complex multi-language 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.
1 day agoContent Complete

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