Senior Frontend Engineer

Mozilla

Senior Frontend Engineer developing high quality user interfaces for Firefox, collaborating with distributed teams at Mozilla. Focusing on accessibility, usability, and performance across platforms.

Posted 6/1/2026full-timeRemote • 🇨🇦 CanadaSenior💰 CA$104,000 - CA$139,000 per yearWebsite

About the role

Key responsibilities & impact

Build high quality user interfaces for Firefox with accessibility and usability in mind
Write code and tests, build prototypes, tackle problems with no clear solution, collaborate with other designers and engineers to make the web a better place
Learn about a wide variety of problems and solutions across a large, mature codebase
Work with cross functional teams, building relationships and fostering collaboration to reach shared goals
Help to level-up the skills of your fellow engineers through code reviews, giving talks, and/or writing documentation
Promote and maintain high standards of code-quality, focusing on performance, testing, security, usability, accessibility and maintainability
Work with driven, committed team members to bring the open web to people around the world
Contribute to improving engineering practices and procedures

Requirements

What you’ll need

4+ years experience as a software engineer
You have a background in shipping high quality software
3+ years working experience with JavaScript, HTML, and CSS
Interest in and ability to work with a distributed team (requires good asynchronous written communication skills as well as good verbal communication skills)
Happy to provide and receive constructive feedback
Will contribute by asking questions and proposing new ideas
A love of working with others collaboratively
Commitment to our values:
Welcoming differences
Being relationship-minded
Practicing responsible participation
Having grit

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

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

JavaScriptHTMLCSScode qualityperformance testingsecurity testingusability testingaccessibility testingmaintainabilityprototyping

Soft Skills

asynchronous communicationverbal communicationconstructive feedbackcollaborationrelationship-buildingproblem-solvingcuriositycommitmentgritresponsible participation