Senior Software Engineer, APZ (Asynchronous Pan & Zoom)
Confirmed on the employer's own hiring board on Oct 20, 2026. First seen by Alion on Jul 15, 2026. Mozilla Corporation scores A on the Alion truth index.
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. 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:
The Firefox Platform Layout/APZ team is a global community of engineers who care deeply about how the Web looks and feels. We are the team responsible for Pan, Scrolling, Zoom, Page Layout, CSS, images, text, printing, and animations in Gecko, the engine behind Firefox. You will be able to design and develop standards-compliant CSS and page layout features that all of our users see, with a current particular focus on Asynchronous Pan and Zoom (APZ), our technology for making user interaction snappy and delightful. Our team is geographically-distributed, and working virtually and in the open is the norm. You can expect to work on the code driving the Firefox browser on a number of platforms - Android, Windows, Linux, and macOS. Our focus is on writing fast, lightweight and maintainable code to make Firefox phenomenal for users.
What you’ll do:
- Work cooperatively with other Mozillians to identify and correct issues, and ask for help as needed
- Write high-quality, performant, open source, and standards compliant code
- Develop innovative layout, graphics, and user interaction techniques, algorithms and tools to maximize the rendering quality and performance of Firefox
- Participate in regular code reviews, team meetings and long-term planning
- Help triage and test bugs, taking the initiative to drill down to root causes and explore potential solutions
What you’ll bring:
- Bachelor’s degree or equivalent experience in Computer Science or similar field
- Experience developing C/C++ and/or Rust applications
- Strong debugging and optimization skills in a multi-threaded environment
- Experience with memory and performance optimization tools
- Proven record of finishing projects where the work spans several months
- Experience participating in and contributing to open source projects and/or web browser development would be beneficial.
- Excellent written and verbal communication skills
- Ability to quickly learn and be effective with a large code base
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 [email protected] 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
Req ID: R3181
Hiring Ranges:
US Tier 1 Locations
$137,000—$183,000 USD
US Tier 2 Locations
$126,000—$168,000 USD
US Tier 3 Locations
$116,000—$155,000 USD