Senior Site Reliability Engineer — Cloud Tooling & CI/CD

Mozilla; Canada; On-site; CAD 116,000 - 171,000; Full time

Benefits offered by this job

Bonus plans

Medical, dental, and vision coverage

Retirement contributions

Wellness days

Holidays plus birthday day off

Home office stipend

Professional development budget

Well-being stipend

Parental leave

Employee referral bonus

Life/AD&D, disability, EAP

Job summary

Mozilla is seeking an experienced software engineer to work on tools and systems supporting Firefox engineering. This role spans internal engineering systems, developer tooling, workflow automation, and production operations, with emphasis on reliability, performance, and cost efficiency.

You will collaborate across teams, contribute to architecture, and apply telemetry and data analysis to guide decisions while embracing open-source principles and cross-team collaboration.

Qualifications

• Strong programming skills in Python or JavaScript/TypeScript; C++ or Rust is useful.
• Experience deploying and operating production systems in cloud environments with infrastructure as code (Terraform).
• Experience across CI/CD, containers & orchestration, networking, databases, observability, or developer tooling.

Responsibilities

• Design, build, deploy, and operate software and systems supporting Firefox engineering.
• Contribute to developer tooling, CI/CD, workflow automation, and AI-assisted development tools.
• Own complex technical problems end-to-end across software, cloud, and operational layers.
• Work with Firefox engineering, Cloud Engineering, IT, and other teams to solve problems that span boundaries.
• Use telemetry, metrics, and data analysis to investigate problems and guide engineering decisions.
• Contribute to architecture and technical strategy, identifying recurring problems and solutions.

Skills

Python

JavaScript/TypeScript

C++

Rust

Tools

Terraform

CI/CD

Containers

Networking

Databases

Observability

Developer tooling

Job description

Mozilla is seeking an experienced software engineer to work on tools and systems supporting Firefox engineering. This role spans internal engineering systems, developer tooling, workflow automation, and production operations, with emphasis on reliability, performance, and cost efficiency.

You will collaborate across teams, contribute to architecture, and apply telemetry and data analysis to guide decisions while embracing open-source principles and cross-team collaboration.