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Senior Software Engineer - Layout (CSS and ICU4X Support)

at Mozilla Corporation
Remote US

Apply Now

Senior Software Engineer - Layout (CSS and ICU4X Support), Mozilla Corporation, Portland, Oregon: Improve Cascading Style Sheets (CSS) style system, within Mozilla's Gecko Engine and design solutions for efficient implementation within the Firefox Browser Layout Architecture stack. Write code, browser tests, and specifications and build prototypes and reference implementations for the Firefox browser in C++ and Rust. Convert user feedback into actionable bug reports, feature designs, and input into the strategic direction of Web Platform to make Firefox more effective and efficient. Convert CSS Working Group specifications into actionable feature designs, and new functionality to make Firefox more effective, efficient, and web compatible. Refactor existing code to optimize for Firefox performance. Repair and update automated test scripts to adapt to changes in the codebase and verify that released code is functioning correctly and efficiently. Guide and mentor consultants and other developers on a project basis, improving project quality and efficiency. Bachelors in Computer Science or related field required. Must have six years of experience programming in C++. Of experience required, must have three years of experience working in the Gecko browser engine or similar. Must also have one year of experience programming in Python, Rust, and JavaScript and experience working with: (i) CSS Support (Shapes, Masking, and eXtensible Bindings Language (XBL) Style Sheet); (ii) Unicode ICU4X and internationalization standards; and (iii) Bugzilla or comparable defect management and workflow tool. Experience may be gained concurrently. Position may be eligible for telecommuting from anywhere in the United States. Apply online:



Hiring Ranges:

US Tier 1 Locations
$145,662$191,634 USD
US Tier 2 Locations
$145,662$191,634 USD
US Tier 3 Locations
$145,662$191,634 USD

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Why Mozilla?

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. With a relatively small team serving hundreds of millions of people, a culture of exploration, and a commitment to mentorship, opportunities abound to learn and grow at Mozilla.

Our values drive our actions

  • Purpose is built into our work, with our mission driving every decision
  • We challenge assumptions, the status quo, ourselves, and each other
  • We are transparent: in our code, our business partnerships, and our everyday interactions
  • We seek out people from diverse backgrounds and with perspectives different from our own
  • We pair purpose with performance and put people ahead of profit

Our impact is global

  • 1000+ paid staff from over 30 countries
  • Thousands of volunteer contributors across six continents
  • 2 global offices: Berlin and Toronto
  • 9 coworking space locations: San Francisco, San Mateo, London, Paris, Portland, Tulsa, Vancouver, Chicago, and Bellevue
  • Hundreds of home offices globally

Our benefits are world-class

  • 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