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Software Engineer, DOM Core

Mozilla

Salary not specified
Nov 7, 2025
Remote, US
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Improve the DOM, HTML, editing, and user interaction capabilities of Mozilla's Web engine (Gecko) with a focus on performance, Web compatibility, and standards correctness.

Requirements

  • Proficiency in and experience developing software in C++
  • Ability to learn a large and complex code base quickly
  • Familiarity with one or more of the following, or ability to pick them up in a timely manner:
    • Multi-process architecture
    • Debugging memory usage or performance profiling
    • The modern Web technologies (JavaScript, HTML, and/or CSS)

Responsibilities

  • Improve the DOM, HTML, editing, user interaction capabilities of our Web engine, with a focus on performance, Web compatibility, and standards correctness
  • Read and implement API specifications, as well as contributing to the standards process by raising issues or participating in discussions
  • Develop and debug in a multi-language, multi-threaded and multi-process code base
  • Work primarily in C++ and write tests largely with HTML and JavaScript.
  • building prototypes
  • solving problems
  • continuously learning and growing as an engineer

Other

  • Comfortable contacting people and driving discussions
  • Motivated to learn new tools and techniques for improving existing software
  • Commitment to our values:
    • Welcoming differences
    • Being relationship-minded
    • Practicing responsible participation
    • Having grit
  • Collaborate with a geographically distributed development team. Working in the open is the norm