Senior Software Engineer, WebExtensions

This is a fully remote position, open to applicants in Germany.

📋 Description

• Develop and sustain WebExtensions APIs and Addon Management, ensuring a balance of power, safety, and performance, alongside user interfaces in Firefox.

• Troubleshoot and resolve issues impacting extensions in Firefox.

• Work collaboratively with product managers, QA, and the AMO engineering team to deliver features from start to finish.

• Contribute to Mozilla-owned extensions and system add-ons.

• Engage in open source practices: code reviews, pull requests, and discussions on Bugzilla/GitHub.

• Assist extension developers by diagnosing problems and enhancing tooling/documentation.

⛳️ Requirements

• A minimum of 4 years of professional experience in software development.

• Strong expertise in JavaScript, DOM APIs, HTML, and CSS.

• Understanding of modern browser architecture and debugging tools.

• Experience in API design and integration.

• Ability to navigate and learn from extensive codebases.

• Excellent communication skills and experience collaborating within 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, particularly in browser or extension development.

🏝️ Benefits

• Generous performance-based bonus plans for all eligible employees - we celebrate our success as one team.

• Comprehensive 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 break together.

• Country-specific holidays plus an extra 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.

• Additional benefits (life/AD&D, disability, EAP, etc. - varies by country).