Senior Software Engineer

Mozilla Corporation is a non-profit-backed technology company that has shaped the internet for the better over the last 25 years. As a Senior Software Engineer on the Ecosystem Services Team, you'll build and maintain back-end systems and integrations, ensuring the reliability and health of services in production while collaborating with cross-functional teams.

Responsibilities:

• Lead backend development, building and maintaining server-side logic
• Take real ownership of the services you work on: deploy them, operate them, and keep them healthy in production rather than handing them off
• Work closely with our CloudEng Team to maintain and improve production environments, including monitoring and alerting with tools such as OpenTelemetry, Sentry, Prometheus, and Grafana
• Participate in an on-call / off-hours support rotation, triaging and resolving production issues, partnering with CloudEng and support teams to investigate incidents, address bug reports, and keep the application running reliably
• Periodically rotate into a support role, handling releases, dependency updates, and incoming work requests from customer support and other stakeholders
• Thoughtfully apply AI-assisted development tools to move faster and raise quality, while maintaining good judgment about where they fit and where they don't
• Partner with and support stakeholders (e.g. front-end, platform), ensuring backend systems, APIs, and data contracts meet their needs
• Partner with frontend and cross-functional teams to align on project goals, contribute to API design, and ensure backend systems, APIs, and data contracts meet their needs
• Participate in code reviews to maintain high standards of code quality and system reliability
• Participate in security and privacy reviews, ensuring all data protection measures meet compliance standards

Requirements:

• 4+ years of experience in software development with a strong focus on backend technologies
• Strong professional experience with Python, TypeScript/Node.js, or Rust building back-end services and confidence leading back-end engineering projects
• Proficiency with PostgreSQL and SQL query optimization, including relational schema design and migrations with a query builder such as Knex
• Hands-on DevOps experience on Google Cloud Platform (GCP), with Docker-based build and deploy pipelines. You are comfortable deploying, operating, and troubleshooting services in the cloud rather than handing that responsibility to someone else
• Hands-on experience with observability and monitoring tooling such as Sentry and Grafana
• A pragmatic commitment to shipping quality work. You care about the quality and reliability of what you ship, you make sensible trade-offs under real constraints, and you consistently move work to and into production
• Strong engineering judgment. You can navigate ambiguity, weigh trade-offs, and make sound decisions with incomplete information, and you know when to ask for input
• A genuine ownership mindset. You are excited to own a service end to end and have a track record of operating what you build in production, including experience with on-call or off-hours production support
• Experience mentoring junior engineers and driving technical excellence in code quality, testing, and process improvements
• Performance / load testing
• Experience with IaC tools such as Terraform and Kubernetes
• Open-source contributions or personal engineering projects
• Django experience