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Mozilla Logo Mozilla · IT - Software Development

Senior Software Engineer (Contract)

Germany · Job Posted June 14, 2026
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Job Description

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 restricted. We are looking for a Senior Software Engineer to support the Privacy Team to advance the Firefox Web Platform.

Job Responsibility

  • Implement Privacy-improving, anti-tracking features and data sanitization into the Firefox web browser to prevent all forms of unhealthy user tracking
  • Implement architectural improvements into Gecko, the browser engine underlying Firefox
  • Build performant, low-latency, and maintainable C++, JavaScript and Rust code
  • Work as part of a geographically distributed team in an asynchronous manner (mostly Europe and US-East).

Requirements

  • Bachelor's degree in computer science, engineering, or a related program
  • or equivalent work experience
  • At least 4 years of experience with programming in C++ and Rust, with a strong background in memory safety, multi-threaded system architecture, or raw data stream manipulation
  • Proven ability to onboard quickly, deliver and improve complex software projects
  • Proven track record of independently scoping and landing complex features within tight release windows
  • Excellent written and verbal communication skills. You can validate your progress and decisions and communicate them clearly.

Nice to have

  • You have already contributed to the Mozilla mission and the codebase
  • Experience working within the browser space (Gecko, Chromium, WebKit) or web engine runtime abstractions
  • Experience or high interest in designing or leveraging ML pipelines to automate internal developer workflows
  • Deep understanding of web architecture, the privacy/security model of the web, and client-side data structures
  • Knowledge of basic statistical modeling
  • Proficiency with Python and SQL.

What we offer

  • Flexible work environment (majority of Mozillians work remotely)
  • Industry-leading paid parental leave (up to 26 weeks of fully paid leave for childbearing parents and up to 12 weeks for non-childbearing parents)
  • Reimbursement for professional development (up to $3,000/year)
  • A work setup including the latest hardware and software of your choice
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