Contract Software Engineer - DOM Core Firefox/Gecko

Mozilla; United States; Remote; USD 120,000 - 160,000; Full time

Job summary

Mozilla in the United States is seeking a test-focused engineer for the Firefox DOM Core team to improve the health of the Session History area. You will write tests to improve coverage, fix failing tests, and contribute to Gecko correctness.

You will collaborate on code reviews with Gecko module owners, expand Web-Platform tests, and help land changes that increase reliability and coverage across the browser engine.

Qualifications

• Substantial experience in a browser-engine codebase or automating for a browser-engine.
• Strong JavaScript skills applied to writing automated tests.
• Proficiency in C++ development and debugging in large codebases.
• Comfort working in open: bugs, code reviews, and upstream landing.

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

Skills

JavaScript

C++

Test automation

Debugging

Browser engine

Job description

The role

You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the 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.

Required qualifications

• 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 larget 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.