Senior Software Engineer

Mozilla’s Ecosystem Services Team is responsible for the back-end platforms that keep Mozilla products and services running reliably at production scale. In this Senior Software Engineer role, you will build and take end-to-end ownership of server-side systems and integrations, including deployment, operations, and incident support, while collaborating with CloudEng and cross-functional partners.

You will help maintain and evolve the cloud infrastructure these services run on, improve reliability through monitoring and alerting, and work closely with front-end and platform stakeholders to ensure backend systems, APIs, and data contracts meet real product needs. The role also includes participation in on-call or off-hours support rotations and periodic rotation into a support-focused capacity for releases and dependency updates.

What you’ll do

• Lead backend development by building and maintaining server-side logic for services that power Mozilla products.
• Operate what you build by deploying, running, and keeping services healthy in production rather than handing work off.
• Collaborate with the CloudEng Team to maintain and improve production environments, including monitoring and alerting using tools such as OpenTelemetry, Sentry, Prometheus, and Grafana.
• Participate in an on-call / off-hours support rotation to triage and resolve production issues, partnering with CloudEng and support teams during incidents and investigations.
• Periodically rotate into a support role, handling releases, dependency updates, and incoming work requests from customer support and other stakeholders.
• Use AI-assisted development tools to move faster and improve quality while applying good judgment about where those tools fit.
• Partner with stakeholders such as front-end and platform teams to ensure backend systems, APIs, and data contracts align with their needs.
• Contribute to API design and cross-functional delivery by aligning with front-end and product partners on project goals.
• Participate in code reviews to uphold code quality and system reliability standards.
• Join security and privacy reviews to help ensure data protection measures meet compliance standards.

What you bring

• 4+ years of software development with a strong focus on backend technologies.
• Strong professional experience with Python, TypeScript/Node.js, or Rust for building back-end services, including confidence leading back-end engineering projects.
• Proficiency with PostgreSQL and SQL query optimization, including relational schema design and migrations using a query builder such as Knex.
• Hands-on DevOps experience on Google Cloud Platform (GCP), including Docker-based build and deploy pipelines, with comfort deploying and troubleshooting services in the cloud.
• Experience with observability and monitoring tools such as Sentry and Grafana.
• A pragmatic approach to shipping quality work, with sensible trade-offs under real constraints and consistent progress into production.
• Strong engineering judgment to navigate ambiguity and make sound decisions with incomplete information, including knowing when to ask for input.
• An ownership mindset with experience operating services end to end in production, including on-call or off-hours production support.
• Experience mentoring junior engineers and driving technical excellence across code quality, testing, and process improvements.

Technologies you may work with

• Python, TypeScript, Node.js, Rust
• PostgreSQL, SQL, Knex
• Google Cloud Platform (GCP), Docker
• OpenTelemetry, Sentry, Prometheus, Grafana
• AI-assisted development tools
• Django, Terraform, Kubernetes

About the Ecosystem Services Team

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 (Mozilla VPN, Relay, Monitor), AutoPush, and Remote Settings.

Teams in this organization 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. Work is done in close collaboration with product, front-end engineering, Cloud Engineering, UX, and design partners to build resilient systems that make the web better for everyone. Mozilla is hiring backend engineers across multiple Ecosystem Services back-end teams, each addressing distinct technical challenges while sharing a culture of ownership, collaboration, and operational excellence.

Bonus points

• Performance or load testing experience
• Experience with Infrastructure as Code (IaC) tools such as Terraform and Kubernetes
• Open-source contributions or personal engineering projects
• Django experience

Location and experience

• Location: Remote
• Minimum experience: 4 years

Benefits

• Generous performance-based bonus plans for eligible employees
• Rich medical, dental, and vision coverage
• Generous retirement contributions with 100% immediate vesting
• Quarterly all-company wellness days
• Country-specific holidays plus a day off for your birthday
• One-time home office stipend
• Annual professional development budget
• Quarterly well-being stipend
• Considerable paid parental leave
• Employee referral bonus program
• Other benefits (life/AD&D, disability, EAP, etc.; varies by country)

Why Mozilla

Mozilla exists to build the Internet as a public resource accessible to all. Mozilla’s mission is to make the internet better for people, and Mozillians design, build, and distribute open-source software.

Diversity, equity, inclusion, and belonging

• Mozilla encourages applications from everyone, including members of equity-seeking communities.
• Mozilla will provide reasonable accommodations for qualified individuals with disabilities during the application or interview process.
• To request accommodation, contact [email protected].
• Mozilla is an equal opportunity employer and does not discriminate or tolerate discrimination or harassment.