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Contract Software Engineer - DOM Core Firefox/Gecko

Mozilla

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LocationUnited Kingdom, Germany, France
Senioritymid-level
CompanyMozilla
Verified recentlyChecked today
Compensation

Salary not listed

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WFH.team analysis

What this posting tells you

Contract Software Engineer role at Mozilla for the Firefox DOM Core team focused on improving Session History test coverage and code correctness in Gecko. Remote work allowed in France, Germany, and the UK. Requires strong experience with browser engine codebases, proficient in C++ and Javascript, and strong debugging skills. Work includes writing and fixing automated tests, code reviews, and open collaboration.

Role lane

Frontend, QA and testing, Security, Software

Where you can work

United Kingdom, Germany, France

Working hours

GMT, CET

Arrangement

mid-level · contract

Required signals
C++JavascriptBrowser engine developmentDebugging large codebasesAutomated testingCode review
Preferred signals
Gecko contributionsWeb standardsWeb Platform Tests
Confirm before applying
  • Compensation is not listed
Market context

Frontend hiring on WFH.team

915active related roles
571new in the latest period
53.7jobs per 100 candidates
$202kmedian of comparable listed ranges

Category counts come from WFH.team's latest published remote job market snapshot.

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Skills and signals
C++JavascriptBrowser engine developmentDebugging large codebasesAutomated testingCode reviewGecko contributionsWeb standardsWeb Platform TestsRemote in France, Germany, UK
Job description

Contract Software Engineer - DOM Core Firefox/Gecko at Mozilla

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.
Company context

Working remotely at Mozilla

A lot of companies say they’re “mission-driven. ” Our unique corporate structure guarantees that every decision we make upholds our mission: to ensure the internet remains open and accessible.

Headquarters
United States, United Kingdom, China, Germany, France, and Canada
Team size
1001-5000
Founded
2005
Remote policy

Remote hiring signal is inferred from active confirmed-remote job listings.

Application process

Review current openings on Mozilla's official careers page before applying.

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