Software Engineer, DOM Core

Software Engineer, DOM Core Join to apply for the Software Engineer, DOM Core role at Mozilla . Why Mozilla? Mozilla Corporation is the nonprofit‑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. With more than 225 million people worldwide 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, while staying true to our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the nonprofit 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 Join the global DOM: Core team of engineers passionate about the Web. We are the team responsible for page navigation, document loading, event handling, user interaction, and text editing in Gecko, the engine behind Firefox. You will implement standardized APIs like DOM, HTML, Events, Editor, and Clipboard. You will push the boundaries of what the Web is capable of. Your responsibilities include writing code, tests, and building prototypes, solving problems, while continuously learning and growing as an engineer. What You’ll Do Improve the DOM, HTML, editing, user interaction capabilities of our Web engine, with a focus on performance, Web compatibility, and standards correctness Read and implement API specifications, and contribute to the standards process by raising issues or participating in discussions Develop and debug in a multi‑language, multi‑threaded and multi‑process code base Work primarily in C++ and write tests largely with HTML and JavaScript – you will learn on the job Collaborate with a geographically distributed development team; working in the open is the norm What You’ll Bring Proficiency in and experience developing software in C++ Ability to learn a large and complex code base quickly Comfortable contacting people and driving discussions Motivated to learn new tools and techniques for improving existing software Familiarity with one or more of the following, or ability to pick them up in a timely manner: Multi‑process architecture Debugging memory usage or performance profiling Modern Web technologies (JavaScript, HTML, and/or CSS) Commitment to our values: Welcoming differences Being relationship‑minded Practicing responsible participation Having grit 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 to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race, religion, 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. Hiring ranges Remote Spain€42,000—€62,000 EUR Seniority level: Entry level Employment type: Full‑time Job function: Engineering and Information Technology Industries: Software Development #J-18808-Ljbffr