Senior Software Engineer Job at Mozilla

Senior Software Engineer

Mozilla

Location:
Multiple

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

65000.00 - 87000.00 EUR / Year

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Job Description:

The Localization Team manages the infrastructure that powers localization across all Mozilla products and services, and supports our global community of volunteer localizers. As a Senior Engineer, you’ll contribute to a range of Mozilla localization projects and technologies — from Pontoon, our Django-based Translation Management System, to open source libraries like moz-l10n. You’ll also engage with development of standards such as Unicode MessageFormat and work on internationalization features that shape the experience of Firefox and other Mozilla products.

Job Responsibility:

Contribute to the development of Python and JavaScript libraries (such as moz-l10n) and tools that support Mozilla’s localization infrastructure
Collaborate with engineers and program managers to design and implement new Pontoon features, across both the front-end and back-end
Improve internationalization within the Firefox codebase to make features more adaptable and accessible across languages and regions
Contribute to discussions shaping Mozilla’s positions on internationalization and localization standards
Engage with our community of volunteer developers and localizers to support and guide Mozilla’s localization efforts
Collaborate effectively with teammates and internal clients across regions and time zones

Requirements:

Strong experience developing and maintaining web applications and tools using Python and JavaScript
Solid understanding of web technologies, APIs, and modern development workflows
Experience with internationalization (i18n) and localization (l10n) concepts, tools, or workflows
Ability to collaborate effectively in a distributed team, across time zones and disciplines
Excellent communication skills, with an emphasis on clarity and working across technical and non-technical roles
Commitment to our values: Welcoming differences, Being relationship-minded, Practicing responsible participation, Having grit

Nice to have:

Fluency in another language and understanding of linguistic diversity (e.g., grammar, plurals, text direction, and cultural conventions)
Experience with open source development practices and community collaboration
Programming experience in Rust and C++

What we offer:

Generous performance-based bonus plans
Rich medical, dental, and vision coverage
Generous retirement contributions with 100% immediate vesting
Quarterly all-company wellness days
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)
Flexible work environment
Industry-leading paid parental leave
Reimbursement for professional development (up to $3,000/year)
A work setup including the latest hardware and software of your choice

Additional Information:

Job Posted:
January 02, 2026

Employment Type:

Fulltime

Work Type:

Remote work

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