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Staff Software Engineer, Web Application Services

Mozilla· Thunderbird
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RemoteCA$155k - CA$190kfull-timePosted 3w ago

About the role

Staff-level IC role to shape architecture and technical direction of Thunderbird's web-based Services products (e.g., calendar, secure file storage/transfer), expanding beyond email and contributing to growth of users and donors.

Responsibilities

  • Lead the technical architecture of new Services products, taking ownership of complex projects and identifying improvements that strengthen our systems as they evolve.
  • Write code, build prototypes and experiments, and contribute throughout the development lifecycle, from planning and testing through implementation, monitoring, and maintenance.
  • Help establish software patterns and make technical decisions across our Services products, including investigating and proposing technology choices.
  • Build and evolve analytics and infrastructure that help the team use user-generated data to inform decisions.
  • Take on ambiguous, high-level problems with broad scope and direct impact on Services goals, including growing users and subscribers.
  • Provide technical and product direction across Thunderbird and lead technical collaboration with other parts of Mozilla and community contributors when needed.
  • Work closely with the team and community to surface issues, refine ideas, and develop practical solutions.
  • Identify and plan improvements that make our systems and processes more accessible, self-serviceable, lower friction, sustainable, scalable, and easier to delegate.
  • Mentor other engineers through code review, documentation, technical discussions, process improvements, and ongoing guidance.
  • Stay current with evolving technologies, coding standards, libraries, and frameworks and apply that knowledge to your work.

Qualifications

  • 10+ years of web software development experience, including designing scalable and efficient systems and launching complex web projects at scale.
  • Expert-level JavaScript skills and knowledge of at least one additional programming language (e.g., Python, Rust, Go, or C++).
  • Understanding of the business landscape and experience collaborating with teams to expand Thunderbird’s user and donor base.
  • Experience with front-end frameworks, full-stack development, and/or API development.
  • Strong knowledge of software development practices (testing, code review, documentation) and ability to help others develop these skills.
  • Experience acting as a technical lead, solving complex technical problems, and mentoring engineers.
  • Experience collaborating remotely across disciplines (engineering, product management, QA, design).
  • Excellent written and verbal English communication and documentation skills.
  • Comfort working in an open-source environment and commitment to Mozilla values.
  • Ability to learn, evaluate, and responsibly use emerging technologies, including AI-enabled tools.
  • Commitment to continuous learning and staying current with industry trends.
  • Ability and willingness to travel periodically (including internationally).

Skills

Required:JavaScriptAdditional programming languageFrontend frameworks / Full-stack / API developmentSoftware development practicesTechnical leadership & mentorshipRemote collaborationCommunicationLearning & adaptabilityTravel willingness

Benefits

  • Fully remote work & schedule flexibility
  • Company-provided laptop
  • Annual bonus program
  • Monthly remote work stipend
  • Annual professional development stipend
  • Access to Coursera learning platform
  • Industry conferences
  • Company all-hands and team gatherings
  • 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
  • RRSP contributions
  • Health, dental, & vision insurance
  • Disability insurance
  • Life insurance
  • Employee assistance program
  • Paid parental leave
  • Paid sick days
Last updated Sep 30, 2026. Interested? Apply on the company site.

About Mozilla

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Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.

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