Kohei Yoshino
UI/UX Developer
Old Toronto, Ontario, Canada
Summary
🤩
RockstarKohei Yoshino is a UI/UX developer with 13 years of experience blending front-end engineering, design, and localization to build inclusive web experiences. A former Mozilla contributor, he has shipped UI enhancements for Firefox and led localization efforts across major open-source projects—ensuring products speak fluently to Canadian English and Japanese audiences. He’s a senior UX engineer and Svelte specialist who also creates and maintains the Sveltia CMS, reflecting a practical full-stack curiosity beyond typical front-end work. Comfortable across front-end, back-end and internationalization, Kohei pairs pixel-level design sense with pragmatic engineering, often improving usability through careful language and UI tweaks. Based in Old Toronto, he brings a marketer’s eye and generalist mindset to freelance and collaborative projects, making complex interfaces feel native to diverse users.
13 years of coding experience
Stackoverflow
141reputation
15kreached
3answers
0questions
Github Skills (37)
javascript10
text-template10
translation10
apidoc10
internationalization10
user-interface10
templater10
ui-design10
perl10
uid10
localize10
localization10
language-translation10
document-template10
firefox10
Programming languages (19)
Github contributions (5)
mozilla-bteam/bmo
Oct 2016 - May 2020
bugzilla.mozilla.org source - report issues here: https://bugzilla.mozilla.org/enter_bug.cgi?product=bugzilla.mozilla.org
Role in this project:
Back-end Developer
Back-end DeveloperContributions:10 reviews, 393 commits, 701 PRs in 3 years 7 months
Contributions summary:Kohei primarily worked on the Bugzilla back-end, contributing to features like adding and modifying API functionalities for attachments. The commits show the user's work related to handling comment tags and implementing new user and component-related data. These modifications suggest involvement in the core infrastructure and enhancement of the existing functionality for the Bugzilla platform. The code changes include the creation of hooks, APIs, and schema modifications, pointing towards back-end development.
jscgireportthunderbirdbugzilla
mozilla/bedrock
May 2013 - Dec 2018
Making mozilla.org awesome, one pebble at a time
Role in this project:Front-end Developer
Front-end DeveloperContributions:550 commits, 326 PRs, 45 pushes in 5 years 8 months
Contributions summary:Kohei primarily contributed to the UI development within the Bedrock repository. Their work involved implementing features such as new toolbar buttons and various visual enhancements to the Firefox browser interface. The commits focused on manipulating existing UI elements to integrate new functionality and features within Firefox. They also engaged in code modifications to resolve styling and layout issues within specific sections of the browser's UI.
pebblefirefoxpythondjangocss
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