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Mozilla

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Senior Software Engineer, WebExtensions

Full-stack EngineerSoftware EngineerFull TimeRemoteSeniorTeam 501-1,000Since 1998H1B SponsorCompany SiteLinkedIn

Location

France

Posted

32 days ago

Salary

€53K - €71K / year

Seniority

Senior

Bachelor Degree4 yrs expEnglishAndroidJavaScriptOpen SourceRust

Job Description

Senior Software Engineer, WebExtensions

Mozilla

• Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox. • Debug and fix issues affecting extensions in Firefox. • Collaborate with product managers, QA, and the AMO engineering team to deliver features end-to-end. • Contribute to Mozilla-owned extensions and system add-ons. • Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub. • Support extension developers by helping diagnose issues and improving tooling/documentation.

Job Requirements

  • 4+ years of professional experience in software development
  • Strong proficiency in JavaScript, DOM APIs, HTML, and CSS
  • Familiarity with modern browser architecture and debugging tools
  • Experience with API design and integration
  • Ability to navigate and learn from large codebases
  • Strong communication skills and experience collaborating in distributed teams
  • Bonus points for:
  • Experience with Firefox internals, C++ or Rust
  • Familiarity with Android or GeckoView development
  • Knowledge of web security principles
  • Contributions to open source projects, especially in browser or extension development

Benefits

  • Generous performance-based bonus plans to all eligible employees - we share in our success as one team
  • Rich medical, dental, and vision coverage
  • Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
  • Quarterly all-company wellness days where everyone takes a pause together
  • Country specific holidays plus a day off for your birthday
  • One-time home office stipend
  • Annual professional development budget
  • Quarterly well-being stipend
  • Considerable paid parental leave
  • Employee referral bonus program
  • Other benefits (life/AD&D, disability, EAP, etc. - varies by country)

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