Senior Software Engineer, Firefox Desktop

Mozilla

Senior Software Engineer contributing to Firefox installations, updates, and OS integrations at Mozilla. Collaborating with distributed teams to deliver high-quality software solutions.

Posted 7/8/2026full-timeRemote • 🇨🇦 CanadaSenior💰 CA$104,000 - CA$151,000 per yearWebsite

Tech Stack

Tools & technologies

MacOS

About the role

Key responsibilities & impact

Contribute to the development and improvement of Firefox features related to installs, updates, and OS integrations.
Help implement enhancements to the Firefox installation and update experience, using data insights to guide development.
Tackle platform-specific challenges in low-level operating system integration on Windows and/or macOS.
Collaborate with your manager and teammates to scope and prioritize work in alignment with the team’s goals.
Participate in code reviews and contribute to technical discussions with peers.
Take ownership of complex bugs and lead efforts to improve the Firefox experience for hundreds of millions of users.
Work closely with your geographically distributed team in a highly collaborative environment.

Requirements

What you’ll need

3-5 years experience as Software Engineer
Experience with systems-level programming on at least one major platform (Windows, macOS)
Solid programming skills in C/C++
Effective communicator and collaborator, especially in distributed teams
Ability to break down technical work and make steady progress within project timelines
A collaborative mindset and a desire to contribute to team success.

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)

ATS Keywords

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Hard Skills & Tools

C/C++ ProgrammingSystems-Level Programming

Soft Skills

Effective CommunicationCollaboration