Senior Full-Stack Engineer, Mozilla

• The ideal candidate will have a strong focus on web development, infrastructure, and service architecture
• This person has direct experience with email delivery, is autonomous, and can lead feature development from an ambiguous project statement to a concrete plan and implementation
• You are passionate about delivering quality to customers and naturally think about products from the user’s perspective, always seeking ways to improve and elevate the experience
• The ideal candidate has strong full-stack development experience and demonstrates collaboration, ownership, and a commitment to building reliable services
• 7+ years of professional software development experience, including 2+ years in a Senior Software Engineer role
• 2+ years of experience with JavaScript/TypeScript and 2+ years working with Python 3
• Experience building and maintaining email services
• Experience building and maintaining web applications
• Experience working across the full software development life cycle, from product inception through customer delivery
• Deep respect for diverse skills and perspectives, with an ability to collaborate effectively across technical and non-technical teams
• Ability to translate wireframes, style guides and design direction into polished, production-ready visual experiences
• Proven ability to deploy and manage web infrastructure on AWS or similar cloud providers
• Strong attention to detail, with excellent learning and exploration skills and a product-focused mindset that looks beyond the code to consider user needs and business goals
• Excellent English written and verbal communication skills, with the ability to clearly and concisely engage with an international, geographically distributed team
• Commitment to collaboration, open development, and building secure, privacy-respecting technology aligned with Thunderbird and MZLA’s values

Desirable

• As a Senior Software Engineer, Web Services, you’ll contribute to a whole new suite of communication tools including end-to-end encrypted file sharing, an email service, an appointment booking service, and more
• You’ll join the Web Services Team, which is responsible for building and maintaining the accounts and email services that power these offerings
• You’ll work closely with designers, engineers, and community members to develop and maintain user-facing features and help diagnose and resolve email issues at scale
• Build and prototype new features and solutions to tackle complex technical challenges
• Develop and maintain metrics to monitor email delivery rates and sender reputation, and diagnose service-level issues
• Monitor email industry standards, trends, and emerging threats, and propose improvements to strengthen delivery, reputation, and spam resilience
• Develop, test, and evolve the code architecture to ensure scalability, maintainability, and robustness
• Conduct code reviews to ensure adherence to quality standards and best practices, and contribute to technical strategy and architectural decision-making
• Along with our designers and product leads, build and deploy prototypes and experiments to improve workflows, conversions, and privacy-respecting analytics capabilities
• Evaluate and implement systems and improvements across security, logging, performance, and accessibility
• Support the stability and reliability of our services, including participation in a shared on-call rotation