Software Engineer, DOM Core

About Mozilla

Mozilla Corporation is a non‑profit‑backed technology company that has shaped the internet for the better over the last 25 years. We develop open‑source products such as Firefox, a privacy‑focused web browser used by more than 225 million people worldwide. Our mission is to make the internet better for people, not for companies.

The Global DOM:
Core team of engineers passionate about the Web. As a member of this team you will implement standardized APIs like DOM, HTML, Events, Editor, and Clipboard, and push the boundaries of what the Web can do.

• Improve the DOM, HTML, and editing capabilities of our Web engine with a focus on performance, compatibility, and standards correctness.
• Read and implement API specifications; contribute to the standards process by raising issues and participating in discussions.
• Develop and debug a multi‑language, multi‑threaded and multi‑process code base, primarily in C++.
• Write tests largely with HTML and JavaScript and learn on the job.
• Collaborate with a geographically distributed development team and work openly.

• Proficiency in C++ and experience developing software in that language.
• Ability to learn a large and complex code base quickly.
• Comfortable driving discussions and contacting people.
• Motivated to learn new tools and techniques for improving existing software.
• Experience, or ability to pick up, one or more of the following: multi‑process architecture, debugging memory usage or performance profiling, modern Web technologies (JavaScript, HTML, and/or CSS).
• Commitment to Mozilla’s values: welcoming differences, being relationship‑minded, practicing responsible participation, and having grit.

• Generous performance‑based bonus plan.
• Rich medical, dental, vision, and other health benefits.
• Generous retirement contributions with 100 % immediate vesting.
• Quarterly all‑company wellness days.
• Country‑specific holidays plus a birthday off day.
• Home‑office stipend and annual professional development budget.
• Paid parental leave and employee referral bonus program.
• Other benefits (life/AD&D, disability, EAP, etc., varies by country).

Mozilla is an equal opportunity employer. We do not discriminate on the basis of race, color, religion, national origin, gender, sexual orientation, gender identity, disability, age, or any other characteristic protected by law. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.