The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute software that enables people to enjoy the internet on their terms. As a Senior Software Engineer on the Ecosystem Services Team, you’ll build and own back-end systems and the integrations that keep our services running, help maintain and evolve the cloud infrastructure the application runs on, and play an active role in keeping the service reliable and healthy in production. You'll do this while collaborating closely with frontend engineers, product managers, CloudEng, and UX and design partners to deliver reliable features. We are looking for engineers who treat the systems they build as their own: people who are comfortable owning a service end to end, from writing the code to verifying it works as intended in production and monitoring its health. We are hiring for multiple Ecosystem Services Team back-end teams
- each solving their own unique challenges to make the web better for everyone. Ecosystem Services builds and operates the back-end platforms that power Mozilla products and services, with a focus on privacy, security, and delivering critical functionality to Firefox and millions of users worldwide. Representative examples include Privacy Services, which provides the APIs and infrastructure behind Mozilla VPN, Relay (email and phone aliasing), and Monitor (data breach detection and remediation); AutoPush, Mozilla's Web Push platform for securely delivering notifications and real-time updates to Firefox clients; and Remote Settings, Mozilla's platform for delivering configuration updates to Firefox outside the regular release cycle.



Together with many other backend platforms across the organization, these services help deliver secure, reliable experiences to Mozilla users every day. Our teams own services end-to-end from designing and building distributed systems, to operating them in production, improving reliability, and evolving the cloud infrastructure they run on. We work closely with product, frontend engineering, Cloud Engineering, UX, and design partners to build resilient systems that make the web better for everyone. We're hiring backend engineers across multiple Ecosystem Services teams, each tackling different technical challenges while sharing a culture of ownership, collaboration, and operational excellence. Lead backend development, building and maintaining server-side logic 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 4+ years of experience in software development with a solid 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. 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. Experience mentoring junior engineers and driving technical excellence in code quality, testing, and process improvements Bonus Points for experience with: Performance / load testing Open-source contributions or personal engineering projects Generous performance-based bonus plans to all eligible employees
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