Senior Software Engineer - Firefox Enterprise

Overview Senior Software Engineer - Firefox Enterprise Remote Spain Why Mozilla? 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: Our team is geographically-distributed, and working in the open is the norm. We contribute to the code driving Firefox on a number of desktop platforms - Windows, Linux, and macOS. Responsibilities Develop, innovate, and ship the next experience of Firefox through improved integration with the operating system. Improve the ease of use and security of Firefox in large deployments by developing better administration and monitoring tools. Assess what work supports the team and product roadmap and make insightful recommendations in regards to priorities. Work with expert software engineers to further develop your understanding of the Windows, macOS and Linux platforms. Optimize the quality of Firefox by hunting down and fixing software defects, improving the experience of hundreds of millions of users. Work with a geographically-distributed development team. Qualifications Experience with systems programming on a major desktop platform (Windows, macOS or Linux). A solid understanding of C/C++ and some knowledge of Rust. You are an excellent communicator and have participated effectively on a distributed team. You’re pragmatic about how to move things forward in specific timeframes including trade-offs and safeguards when implementing new functionality. Experience working collaboratively with product managers, project managers, and/or other non-engineering teams. Bonus Points Professional programming experience in Rust. You have developed cross-platform desktop applications, particularly when this involves low level systems programming such as Cocoa APIs on macOS or GTK on Linux. You have previously successfully contributed to an open source project. We value a variety of voices within our team and at Mozilla. You don't need to check every box on this list to apply. 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 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 orientation s, 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. J-18808-Ljbffr

Location: España, ES

Posted Date: 11/20/2025