Senior Fullstack Engineer (Email Systems)

TL;DR

Senior Fullstack Engineer (Email Systems): Building and optimizing a new suite of communication tools including end-to-end encrypted file sharing and email services with an accent on web development, infrastructure, and service architecture. Focus on leading feature development, diagnosing and resolving email issues at scale, and ensuring system stability and reliability.

Location: Remote. Applicants must reside in and have permanent work authorization for the UK.

Salary: £62,000 - £72,000 GBP

Company

hirify.global (MZLA) is a wholly owned subsidiary of the Mozilla Foundation, home to Thunderbird, an open-source email and productivity platform.

What you will do

• Build and prototype new features and solutions to tackle complex technical challenges.
• Develop and maintain metrics to monitor email delivery rates and sender reputation.
• Monitor email industry standards, trends, and emerging threats, and propose improvements to strengthen delivery and spam resilience.
• Develop, test, and evolve the code architecture to ensure scalability, maintainability, and robustness.
• Conduct code reviews and contribute to technical strategy and architectural decision-making.
• 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.

Requirements

• 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 and web applications.
• Experience working across the full software development life cycle.
• Proven ability to deploy and manage web infrastructure on AWS or similar cloud providers.
• Excellent English written and verbal communication skills.
• Applicants must reside in and have permanent work authorization for the UK.

Nice to have

• Background in Java and/or Rust development.
• Familiarity with Stalwart (email server) or Keycloak (Identity Provider).
• Practice writing Infrastructure as Code (IaC), ideally with Pulumi.
• Contributions to open-source projects or active engagement with open-source communities.

Culture & Benefits

• Fully remote work and schedule flexibility.
• Discretionary Annual Bonus Program and professional development stipend.
• 24 days PTO per year, your birthday, year-end company shutdown, 9 wellbeing days, and public holidays.
• Pension Contributions, Health, Dental, & Vision Insurance.
• Paid Parental Leave and Sick Days.
• Work with passionate staff and open-source community members from all over the globe.