Staff Software Engineer, Web Application Services

About this role

Mozilla Thunderbird is hiring a Staff Software Engineer, Services. The role focuses on shaping the architecture and technical direction of web-based products that extend Thunderbird beyond email, such as an appointment calendar and secure file storage. It is a senior individual contributor position with broad technical ownership, collaboration with designers, engineers, and community members, and mentoring responsibilities. The team aims to build privacy-respecting tools and diverse revenue streams while growing users and subscribers. Thunderbird operates as a nonprofit-owned entity within the Mozilla family, with its own compensation and employment policies. The job involves working across Mozilla and community contributors to define patterns, drive data-informed decisions, and scale services.

What you would do

• Lead the technical architecture of new Services products and identify improvements for evolving systems.
• Write code, build prototypes, conduct experiments, and contribute through the full development lifecycle.
• Help establish software patterns and make technical decisions across Services products.
• Build and evolve analytics and infrastructure to inform decisions using user data.
• Address broad, high-level problems with direct impact on Services goals, including growth of users and subscribers.
• Provide technical and product direction across Thunderbird and collaborate with Mozilla teams and contributors.
• Collaborate with team and community to surface issues, refine ideas, and develop practical solutions.
• Plan improvements to make systems and processes more accessible, self-serviceable, and scalable.
• Mentor other engineers through code reviews, documentation, and guidance.
• Stay current with technologies and apply knowledge to work.

What they are asking for

• 10+ years of web software development experience with scalable systems and large-scale projects.
• Expert-level JavaScript and proficiency in at least one additional language (e.g., Python, Rust, Go, or C++).
• Understanding of business landscape and ability to collaborate to expand Thunderbird’s user and donor base.
• Experience with front-end frameworks, full-stack development, and/or API development.
• Strong practices in testing, code review, and documentation, with ability to mentor others.
• Experience as a technical lead and in mentoring engineers.
• Experience collaborating remotely across engineering, product management, QA and design.
• Excellent written and verbal English communication for distributed teams.
• Comfort working in an open-source environment and commitment to Mozilla values.
• Willingness to learn new technologies, including AI-enabled tools, and travel periodically.

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