Senior Software Engineer, Firefox Security Team: Firefox Remote Sweden, Remote UK, Remote France, Remote Germany, Remote Finland, Remote Belgium, Remote Spain, Remote Netherlands 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. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute software that enables people to enjoy the internet on their terms. At Mozilla, we're serving humanity—by maintaining a safe, open internet—while also helping the individual humans employed here to reach their personal and professional goals. Design, build and implement security and hardening features for enterprise users: Design, implement, test, and ship cutting?edge security features that strengthen Firefox's security posture. Advance Firefox's security architecture across multiple operating systems: edge improvements to Firefox's core security posture, by building privilege isolation and moving trust boundaries or Strengthen Firefox's security architecture:



Improve Firefox's core security mechanisms including cryptographic protocols, WebPKI, and security?sensitive web APIs. Contribute to our security initiatives: Work across teams to investigate security issues, identify root causes, and deliver robust, maintainable fixes. Improve browser reliability and performance: Diagnose and resolve issues affecting stability, correctness, performance, and memory usage in a complex, multithreaded environment. Systems programming experience and security knowledge: level software engineering, strong proficiency in C and/or C++, and a solid understanding of security fundamentals. platform native applications, including memory and performance challenges. Web platform and modern systems

experience:
Familiarity with web technologies (HTML, CSS, JavaScript) and interest or experience in Rust; Generous performance?Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Country specific holidays plus a day off for your birthday One?time home office stipend Annual professional development budget 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.



Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. 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. 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. Remote Netherlands €**—€** Remote Sweden Remote UK Remote France Remote Germany Remote Finland Remote Belgium Remote Spain Remote Netherlands Purpose is built into our work, with our mission driving every decision We pair purpose with performance and put people ahead of profit Our impact is global ****+ 2 integral offices: Hundreds of home offices globally Flexible work environment (majority of Mozillians work remotely) Reimbursement for professional development (up to $3,000/year) A work setup including the latest hardware and software of your choice #

📌 Senior Software Testing Engineer (España)
🏢 Thunderbird
📍 España