Software Engineer, Firefox Desktop Integrations

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. About this team: The Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well! Desktop Integrations is part of Firefox Growth: a cross-functional team of engineers, product managers, designers, and data scientists focused on helping more people discover, choose, and keep coming back to Firefox. We build the places where Firefox meets the operating system: notifications that reach people even when Firefox is closed, pinning web apps to the taskbar, launch on login, and making Firefox the default browser on Windows and macOS. We ship these as experiments, measure their impact on engagement, and double down on what works. Our team is geographically distributed, and working in the open is the norm. We contribute to the code driving the Firefox browser on all desktop platforms. About the role: A Software Engineer is an early-career individual contributor who is growing in their ability to take on more complex tasks. At Mozilla, this role involves working on engineering projects that typically span several weeks and require collaboration with peers. Software Engineers at this level contribute to implementation, ask thoughtful questions, and raise blockers early. They communicate clearly within their team, follow team processes, and steadily build expertise in their domain. What you’ll do: • Build and maintain Firefox features that help people get more value from Firefox and keep coming back, from OS notifications to taskbar and startup integrations. • Implement product experiments with guidance from senior engineers, including feature flags, targeting, and telemetry, so we can measure what actually moves engagement. • Work on platform-specific challenges on Windows and/or macOS where Firefox interacts directly with the operating system. • Partner with product, design, and data science to understand the goal behind each feature and how its success will be measured. • Collaborate with your manager and teammates to define and scope tasks, with regular check-ins to share progress and ask for support when needed. • Participate in code reviews to grow your understanding and contribute to a high-quality codebase. • Help identify and fix bugs that improve the Firefox experience for our global user base. • Engage with a distributed team and contribute positively to our open and inclusive work environment. What you’ll bring: • Proficiency in at least one of C++, Rust, or JavaScript, and willingness to learn the others. • Some experience building software that runs on a major desktop platform (Windows, macOS, or Linux). • Curiosity about users and impact: you care whether a feature is used, not just whether it ships. • Willingness to communicate clearly, ask questions, and seek feedback. • Ability to contribute to collaborative projects and steadily build up your technical and problem-solving skills. • A growth mindset and enthusiasm for contributing to impactful software. Bonus Points • Exposure to native Windows or macOS APIs (such as Win32, WinRT, or Coco