Release Engineer

Mozilla • Toronto, Ontario, Canada • Posted March 14, 2026

Location Toronto, Ontario

Job Type Full-time

Category Computer Occupations

Posted March 14, 2026

The Opportunity
:As a Release Engineer you will play a key role in building, maintaining, and evolving the automation systems that power Thunderbird’s software releases across desktop and mobile platforms (Linux, Windows, macOS, Android, and iOS).

You’ll join the Release Operations team, which is responsible for ensuring our builds are reliable, reproducible, secure, and delivered on time to millions of users worldwide. This team operates at the intersection of engineering, infrastructure, and product delivery, strengthening our automation systems and enabling developers to ship with confidence.

Because Thunderbird shares upstream technologies with Firefox, you will collaborate across the broader Mozilla ecosystem to adapt and integrate build system changes into Thunderbird’s release pipeline.

What you’ll do: 
Develop and maintain workflows for automating software builds and releases, including managing dependen...
            

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