The Mozilla Corporation’s Gecko networking team is looking for skilled developers to work on a first-class networking stack and improve web experiences for millions of Firefox users. The team is working on the core of the browser that moves the web. The fundamental network protocols and features like HTTP, QUIC, caching and DNS are our responsibility. We strive to provide a performant and secure browsing experience for the users. Furthermore we work on advanced web platform networking API like Fetch and WebTransport. We improve our existing implementations and together with the broader community we advance the web through the evolution of relevant standards.

Is debugging networking protocols or multi-threaded applications  an exciting challenge for  you? If you’re also enthusiastic about working collaboratively with a worldwide community, we’d love to hear from you!

Opportunities to collaborate with other browser teams, and working in the open is the norm. Firefox is a mature project always looking for new optimizations, and we are trying to write some of our new components in Rust. You’ll be responsible for writing code, tests, specifications, building prototypes, solving problems, and analyzing data. You’ll get feedback from real users and synthesize it into bug reports, feature designs, and strategic direction to make the web platform even better over time.

In this role you will:

• Improve Firefox’s web browsing experience with a particular focus on the networking stack and network related API, e.g. Fetch, WebTransport, etc.
• Design and implement new web platform features in collaboration with the web community.
• Debug and fix problems in our multi-threaded codebase.
• Debug platform-specific networking issues.
• Improve Firefox’s stability and correctness.
• Analyze and reduce Firefox’s memory usage.
• Work cooperatively with other Mozillians to identify and correct issues.

Your professional profile:

• Proficient with C++.
• Experience or interest in learning Rust.
• Networking experience, including strong familiarity with tools such as Wireshark and protocols such as TCP, UDP, SSL/TLS, and HTTP.
• Experience working on a cross-platform native application.
• Creative problem-solver and skilled debugger.
• Experience writing and debugging multi-threaded code.
• Ability to learn a large and complex multi-language code base.
• Excellent written and verbal communication skills.
• Familiarity or interest in learning the modern web platform.