Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)

Mozilla is seeking a Senior Contract Software Engineer with expertise in C++ and JavaScript to join the Firefox DOM Core team, focusing on enhancing the Session History functionality. Daily tasks will involve writing and fixing tests to boost test coverage and ensure the correctness of the Gecko engine. The role requires substantial experience with browser-engine codebases, particularly with Firefox/Gecko, along with strong skills in JavaScript for automated testing and proficiency in C++. Candidates should possess strong debugging abilities within large, mature codebases and be comfortable engaging in open development practices, including public bug tracking and code reviews. Prior contributions to Gecko or similar browser engines, as well as familiarity with web standards and Web Platform Tests, are preferred qualifications. This position is fully remote, making it suitable for individuals who thrive in a flexible work environment. The role is ideal for those who are passionate about improving browser functionality and have a solid technical background in software development.