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Mozilla Logo Mozilla · IT - Software Development

Staff Engineer, Front End (Desktop)

United States; United Kingdom; Canada 150000.00 - 175000.00 USD / Year · Job Posted March 19, 2026
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Job Description

As a Staff Software Engineer, Front-End, you’ll serve as a domain expert who deeply understands the complexities of shaping seamless, user-focused interfaces and delivering high-quality front-end solutions that align with product strategy. You’ll join a team of talented front- and back-end engineers who bring deep expertise to the development and maintenance of our flagship desktop application, cherished by millions of users worldwide for over 20 years. You’ll work closely with engineers and cross-functional partners to tackle ambiguous problems in user experience, performance optimization, and architectural design. You’ll play a vital part in translating strategy into action by influencing technical direction, mentoring engineers at multiple levels, and ensuring that technical decisions align with MZLA’s mission and the objectives of the Thunderbird Project, particularly in delivering exceptional user experiences.

Job Responsibility

  • Lead complex, ambiguous technical initiatives requiring cross-team and cross-organization coordination
  • Own and deliver projects spanning new features, code quality improvements, tooling, and process optimization
  • Partner with senior engineers and product managers to define and execute technical strategy, reduce technical debt, and improve long-term maintainability
  • Collaborate closely with UX Engineers to ensure accessibility and usability are built in from the start (WCAG, ARIA)
  • Establish and promote scalable front-end architecture through shared frameworks and guidelines
  • Write high-quality, testable, and maintainable code
  • contribute to code reviews, testing, regression triage, and patch integration
  • Mentor and support engineers across the team, fostering a culture of learning and continuous improvement

Requirements

  • 10+ years of experience in front-end software development, building scalable, maintainable, and user-focused systems
  • Extensive knowledge of modern vanilla JavaScript concepts (module patterns, async and promises, custom elements and shadow DOM), and up to date knowledge with the most recent ECMAScript specification
  • Strong command of modern JavaScript frameworks such as React, Vue, or similar, and experience transitioning legacy codebases to new technologies
  • Deep knowledge of HTML5 structures and advanced accessibility patterns
  • Deep knowledge of modern CSS patterns and methods
  • In-depth understanding of system architecture, design patterns, and software engineering best practices, with a focus on performance, scalability, and maintainability
  • Proven ability to act as a technical lead and mentor, providing guidance on complex technical problems and supporting the growth of other engineers
  • Experience developing and testing applications across multiple platforms (Windows, macOS, and Linux), with expertise in Git or Mercurial and modern version control workflows
  • Excellent communication and documentation skills, a collaborative approach to cross-functional work
  • A strong commitment to continuous learning and improvement

Nice to have

  • Experience contributing to or leading open-source projects
  • Experience with Python or other programming languages
  • Ability to engage with and support a global community of developers, including managing feedback and fostering an inclusive and productive ecosystem
  • Proficiency in French, German, Japanese, or another language in addition to English

What we offer

  • Fully remote work & schedule flexibility
  • Latest Laptop
  • Discretionary Annual Bonus Program
  • Monthly Remote Work Stipend
  • Annual Professional Development Stipend
  • Access to Udemy Learning Platform
  • Industry Conferences
  • Company All Hands
  • 24 days PTO per year (prorated)
  • Your Birthday
  • Year-end Company Shutdown
  • 9 Wellbeing Days
  • Public Holidays
  • Other Paid Leave
  • Quarterly Wellbeing Stipend for Personal / Family Activities
  • 401(k) / RRSP/ Pension Contributions
  • Health, Dental, & Vision Insurance
  • Disability Insurance
  • Life Insurance
  • Employee Assistance Program
  • Paid Parental Leave
  • Paid Sick Days
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