The Senior Software Engineer (Localization) at MZLA Technologies Corporation (MZLA) will play a key role in advancing Mozilla's localization infrastructure, contributing to open-source tools such as moz-l10n and Pontoon. This position supports the internationalization of Firefox and other products, working closely with engineers, program managers, and a global network of volunteer localizers to uphold Mozilla’s mission of an open and accessible internet.
What You'll Do
- Contribute to the development of Python and JavaScript libraries (such as moz-l10n) and tools that support Mozilla’s localization infrastructure.
- Improve localization and internationalization within the Firefox codebase to make features more adaptable and accessible across languages and regions.
- Collaborate with engineers and program managers to design and implement new Pontoon features.
- 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.
What We're Looking For
- Strong experience developing and maintaining libraries and tools using Python and JavaScript.
- Solid understanding of web technologies, APIs, and modern development workflows.
- Experience with open source development practices and community collaboration.
- 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.
- Professional fluency in English (written and verbal).
Nice to Have
- Experience with internationalization (i18n) and localization (l10n) concepts, tools, or workflows.
- Programming experience in Rust and C++.
- Fluency in another language and understanding of linguistic diversity (e.g., grammar, plurals, text direction, and cultural conventions).
Technical Stack
Python, JavaScript, moz-l10n, Pontoon, Django, Unicode MessageFormat, DOM Localization, Rust, C++
Team & Environment
Localization Team managing infrastructure for all Mozilla products and services, supporting a global community of volunteer localizers.
Benefits & Compensation
- 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)
Compensation: €55,000 - €74,300 EUR (Remote Belgium), performance-based bonus, retirement contributions with 100% immediate vesting.
Work Mode
Fully remote with global team collaboration across time zones. Location: Remote Belgium.
Mozilla is an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. We encourage applications from everyone, including members of all equity-seeking communities.
