← all jobs

Senior Contract Software Engineer (JavaScript) - Firefox

Work from home Full-time role Hiring

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.

More open positions

Business Intelligence Data Architect

Work from home Full-time role

Senior Data Scientist, Product

Work from home Full-time role

Sales Development Representative 2

Work from home Full-time role

Senior Account Executive

Work from home Full-time role

Solutions Delivery Manager

Work from home Full-time role

Remote Survey Participant

Work from home Full-time role

Senior Product Manager, Authorization Optimization

Work from home Full-time role

Account Executive - Enterprise -LATAM

Work from home Full-time role

Senior B2B Sales Executive

Work from home Full-time role

Amazon Brand Manager

Work from home Full-time role

Internal Customer Success Manager (INS891)

Work from home Full-time role

Account Manager (Digital Marketing)

Work from home Full-time role

Principal Product Manager, Patient Growth

Work from home Full-time role

Senior Customer Support Advisor – Technical & SaaS Support Specialist for Innovative Location Marketing Cloud at brighthush

Work from home Full-time role

Scaled Customer Success Manager – Digital‑First Engagement Lead for SaaS Growth & Customer Advocacy

Work from home Full-time role

Senior Java Developer

Work from home Full-time role

Arity - Customer Success Implementation Intern

Work from home Full-time role

Contractor, Clinical Trial Manager

Work from home Full-time role

Regional Sales Manager-Florida

Work from home Full-time role

Seasoned Remote Paid Panel Customer Service Representative – Flexible, High‑Impact Customer‑Experience Specialist Driving Market‑Research Innovation at brighthush

Work from home Full-time role

Senior Director, Finance - Product & Technology - Digital Business (Remote, US)

Work from home Full-time role