Eemeli Aro
Staff Software Engineer at Mozilla
Helsinki, Mainland Finland
Summary
🤩
Rockstar🎓
Top SchoolEemeli Aro is a Staff Software Engineer based in Helsinki with 13 years of experience building full-stack web applications and developer tooling. At Mozilla since 2021 he focuses on localization and internationalization, contributing significant improvements to high-profile projects like Pontoon and Gecko that touch Firefox’s global user base. Eemeli blends front-end polish with backend robustness—refactoring libraries, modernizing build and linting workflows, and addressing developer experience issues such as M1 setup and cross-browser support. His open-source work spans Project Fluent, react-flexbox-grid, and other widely used repos, showing a pragmatic attention to code quality, type safety, and build systems. Holding advanced degrees from Imperial College London and Aalto University, he pairs research-caliber rigor with practical shipping velocity. Notably, he often surfaces subtle internationalization telemetry and locale-fallback fixes that improve product behavior for underrepresented languages.
12 years of coding experience
Doctor of Science (D.Sc.), Doctor of Science (D.Sc.) at Aalto UniversityMaster’s Degree, Master’s Degree at Imperial College London
Github Skills (29)
javascript10
python10
typescript10
internationalization10
eslint10
localization10
build-automation10
typescript-types10
css-modules10
typescripts10
fluentd10
react10
testing9
react-components9
react-component9
Programming languages (25)
Github contributions (5)
mozilla/pontoon
Jul 2021 - Jan 2023
Mozilla's Localization Platform
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:596 reviews, 102 commits, 178 PRs in 1 year 6 months
Contributions summary:Eemeli contributed to the Mozilla Pontoon localization platform by implementing new features, fixing bugs, and refactoring existing code. They added repository links to the developer documentation, addressed M1 MacBook setup issues in the documentation, and linked actionable strings from "new strings" notifications. The user also updated the list of supported browsers and added project and locale-specific insights, demonstrating proficiency in both front-end and back-end aspects of the project.
djangotranslationjavascriptpontoondesign
projectfluent/fluent.js
Jul 2021 - May 2022
JavaScript implementation of Project Fluent
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:18 releases, 59 reviews, 37 commits in 9 months
Contributions summary:Eemeli primarily contributed to refactoring and updating the project's build and development configurations. They modified the project's ESLint and TypeScript configurations, switching from `nyc` to `c8` for code coverage. These changes included updating dependencies, adding build scripts, and adding common configurations to the project, showing a strong focus on improving the development workflow. Additionally, the user added file extensions to import statements and adjusted the code style to align with the updated linter rules, improving code quality and maintainability.
l10ntranslationinternationalizationicui18n
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