Who you are

• 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
• Background in Java and/or Rust development
• Familiarity with Stalwart (email server)
• Hands-on work developing and maintaining an Identity Provider (IdP) such as Keycloak or similar
• Practice writing Infrastructure as Code (IaC), ideally with Pulumi
• Contributions to open-source projects or active engagement with open-source communities
• Strong communication and documentation skills are essential for effective collaboration

What the job involves

• 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
• You’ll work with passionate staff and open-source community members from all over the globe to support the mission and objectives of MZLA and Thunderbird

The application process

• We want to hear your perspective, not a bot’s. It's fine to use AI to polish your writing, but not to write your answers. Candidates who submit unoriginal AI generated answers will be disqualified from further screening

Benefits

• Health and wellness: Mozilla covers medical, dental and vision plan premiums at 100% for U.S. and Canadian employees. Our offerings give you the options you need to manage your health — and your family’s — the way you want.
• Mental health: Mental health is as important as our physical health. That’s why Mozilla’s health benefits include therapy and coaching sessions to make sure our people have access to the care they need.
• Time away: With all of life’s demands, time away from work to disconnect and recharge is essential. In addition to country-specific holidays (12 in the U.S. and Canada), vacation and sick time start accruing right away (specifics vary by country). Everyone also takes a pause together on quarterly all-company wellness days, plus you get to celebrate the most personal holiday of all: your birthday.
• Parental leave: While Mozilla’s parental leave policies vary globally, our U.S. and Canadian-based employees can look forward to 26 weeks of paid leave for childbearing parents and 12 weeks of paid leave for non-childbearing parents.
• Financial: Mozilla is a private company, so our compensation isn’t tied to stock options or equity plans. Instead, we offer generous, performance-based bonus plans to all regular employees to underscore that we share in our success as one team. As for retirement savings for US and Canadian employees, Mozilla contributes a percentage of your eligible base salary each year to the 401(k) Plan/RRSP (regardless of whether you contribute or not), with 100% vesting.
• Learning and development: We’re big believers in learning by doing, and we also want to invest in your education and development beyond your role. Every employee is eligible for an annual professional development budget. Mozillians can put it toward technical or management training, certifications, conferences and more.
• Help when you need it: Life is full of surprises; that’s why it’s important to be prepared. Mozilla provides Life/AD&D and Short and Long Term Disability insurance (offerings may vary by locale) to ensure that you and your family will have a safety net in place should you ever need it.
• Plus a bit more: A few other benefits include a quarterly wellbeing stipend (to use on those things just for you), an employee referral bonus, internet reimbursement if you’re remote, and a budget for office essentials to make working remotely ergonomically comfortable.