Senior Software Engineer

Mozilla

Senior Software Engineer building and maintaining backend systems for Mozilla products. Collaborating with cross-functional teams to ensure reliable performance and system health in production.

Posted 7/28/2026full-timeRemote • 🇨🇦 CanadaSenior💰 CA$104,000 - CA$139,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates strong backend development capabilities with expertise in Python, TypeScript/Node.js, and Rust, alongside hands-on experience in Google Cloud Platform and DevOps practices. Proven ability to maintain high code quality, mentor junior engineers, and ensure system reliability through effective monitoring and observability tools.

Highest-signal resume keywords

Backend DevelopmentPython ProgrammingGoogle Cloud Platform (GCP)PostgreSQL OptimizationDevOps Practices

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

PythonTypeScriptNode.jsRustPostgreSQLSQL Query OptimizationDockerAPI DesignCode ReviewObservability Tools

Soft Skills

Engineering JudgmentOwnership MindsetMentoring

Tools & Technologies

OpenTelemetrySentryPrometheusGrafanaKnex

Industry Keywords

DevOpsCloud EngineeringProduction SupportData Protection Compliance

Tech Stack

Tools & technologies

CloudDockerGoogle Cloud PlatformGrafanaJavaScriptNode.jsPostgresPrometheusPythonRustSQLTypeScript

About the role

Key responsibilities & impact

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

What you’ll need

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

Benefits

Comp & perks

Generous performance-based bonus plans to all eligible employees - we share in our success as one team
Rich medical, dental, and vision coverage
Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
Quarterly all-company wellness days where everyone takes a pause together
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)