Senior Contract C++ / JavaScript Software Engineer (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 component. Daily tasks will involve writing and improving Web-Platform tests and Gecko mochitests, as well as fixing issues to ensure the correctness of Gecko. The role requires substantial experience with browser-engine codebases, particularly with Firefox/Gecko, and strong skills in debugging within large codebases. Candidates should be proficient in JavaScript for automated testing and have a solid background in C++ development. Familiarity with web standards and prior contributions to Gecko or other major browser engines are preferred. The position is remote, making it suitable for individuals comfortable with open collaboration, including public bug tracking and code reviews. This role is ideal for those who want to contribute to improving test coverage and code correctness while allowing senior engineers to concentrate on other critical projects.