# Senior Software Engineer, Accessibility

**Company:** [Mozilla](https://hotfix.jobs/companies/mozilla)
**Location:** Remote
**Role:** Fullstack Engineering
**Experience:** 5+ years
**Skills:** C++, JavaScript, Aria, Gecko, Web Accessibility, Multi-Threaded Programming, Cross-Platform Development, Web Standards
**Posted:** 2026-07-15

> Senior Software Engineer improving the architecture, stability, and performance of Firefox's core Gecko accessibility engine. Requires strong C++ and systems programming experience, knowledge of web accessibility/ARIA, and the ability to debug complex multi-process codebases.

## Job Description

## 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)

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**Apply:** https://hotfix.jobs/jobs/99787cbe-3743-4ad9-86d3-bc295d57fc1b
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