Senior Software Engineer (WebExtensions)

TL;DR

Senior Software Engineer (WebExtensions): Implement and maintain WebExtensions APIs, Addon Management, and user interfaces in Firefox with an accent on balancing power, safety, and performance. Focus on debugging extension issues, evolving Gecko platform capabilities, and advancing cross-browser compatibility and standardization.

Location: Remote Germany

Salary: €68.000 - €91.000

Company

hirify.global Corporation is a non-profit-backed technology company building Firefox and focusing on privacy, open-source software, and web standards.

What you will do

• Implement and maintain WebExtensions APIs, Addon Management, and Firefox user interfaces balancing power, safety, and performance.
• Debug and fix issues affecting extensions in Firefox.
• Collaborate with product managers, QA, and AMO engineering to deliver end-to-end features.
• Contribute to hirify.global-owned extensions and system add-ons.
• Participate in open source workflows including code reviews, pull requests, and Bugzilla/GitHub discussions.
• Support extension developers with issue diagnosis and improved tooling/documentation.

Requirements

• 4+ years of professional software development experience
• 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 in distributed teams

Nice to have

• Experience with Firefox internals, C++ or Rust
• Familiarity with Android or GeckoView development
• Knowledge of web security principles
• Contributions to open source projects, especially browser or extension development

Culture & Benefits

• Generous performance-based bonuses
• Rich medical, dental, and vision coverage
• Generous retirement contributions with 100% immediate vesting
• Quarterly all-company wellness days and country-specific holidays plus birthday off
• One-time home office stipend, annual professional development budget, and quarterly well-being stipend
• Considerable paid parental leave, employee referral bonuses, and other benefits varying by country