Senior Contract Software Engineer (JavaScript) - Firefox

Mozilla is seeking a Senior Contract Software Engineer with a focus on JavaScript to join the Firefox DOM Core team. The primary responsibilities include enhancing the Session History area by writing and fixing tests to ensure the correctness of Gecko, the underlying engine of Firefox. Daily tasks involve creating Web-Platform tests and Gecko mochitests, as well as collaborating with Gecko module owners during code reviews. The role requires substantial experience with browser-engine codebases, particularly with Firefox/Gecko, and strong skills in JavaScript for automated testing. Additionally, proficiency in C++ and strong debugging abilities in large codebases are essential. Candidates should be comfortable working in an open environment, engaging with public bugs and code reviews. Prior contributions to Gecko or other major browser engines, along with familiarity with web standards and Web Platform Tests, are preferred. This position is remote, making it suitable for individuals who thrive in flexible work arrangements.