Senior Contract Software Engineer (JavaScript) - Firefox

Remote UK

About the Position

Join Mozilla's Firefox DOM Core team as a Senior Contract Software Engineer (JavaScript) to improve Session History test coverage and Gecko correctness.

Responsibilities

• Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed
• Fix the problems and pass the tests to improve the Gecko correctness
• Work through code review with the relevant Gecko module owners and iterate to landing

Definition of Done

Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team’s senior engineers to focus on security, performance, and strategic projects.

Requirements

• Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko.
• Solid JavaScript and applying that language skill to write automated tests.
• Proficiency in and experience developing software in C++.
• Strong debugging skills in a mature large codebase.
• Comfort working in the open: public bugs, code review, and upstream landing.

Preferred

• Prior contributions to Gecko or another major browser engine.
• Familiarity with web standards and Web Platform Tests.

We Offer

• Opportunity to work with a leading open-source project
• Remote work options
• Collaborative and innovative work environment

About the Company

Mozilla is a global non-profit dedicated to ensuring the internet is a global public resource, open and accessible to all.