Jeffery T
Founder at Yarn Labs
Hong Kong, China
Summary
🤩
Rockstar🎓
Top SchoolJeffery T is a founder and seasoned front-end web developer with 17 years of experience building user-facing products and maintaining critical build systems. Based in Hong Kong, he blends hands-on JavaScript and UI expertise with deeper work on embedded systems, OpenWrt package maintenance, and build automation—demonstrating a rare full-stack comfort across browsers to firmware. He founded Yarn Labs in 2014 and previously advanced web projects at Isobar while cultivating a pragmatic philosophy: ship well, keep improving, and lead by example. An active open-source contributor, he’s fixed cross-browser polyfills for legacy IE8 and resolved subtle build and packaging bugs across widely used OpenWrt repositories. Colleagues note his reliability and interpersonal focus—he treats technical problems as tools for solving human problems and emphasizes clear communication. Outside work he appreciates simple rituals (“For relaxing times, make it Suntory time”), a small hint at a measured, thoughtful approach to work-life balance.
17 years of coding experience
6 years of employment as a software developer
Honours Bachelor of Science, Honours Bachelor of Science at University of Toronto
Stackoverflow
11,886reputation
1.9mreached
146answers
0questions
html
top-1%
css
top-5%
viewport
top-5%
security
top-5%
jquery
top-5%
ajax
top-5%
Github Skills (58)
git10
javascript10
package-management10
python10
scripting10
routers10
architecture10
patch10
packaging10
router10
bash10
build-system10
cmake10
backward-compatibility10
python-packaging10
Programming languages (18)
Github contributions (5)
louisremi/background-size-polyfill
Jul 2013 - Dec 2013
Adds support for background-size "cover" and "contain" to IE8
Role in this project:
Front-end Developer
Front-end DeveloperContributions:74 commits in 4 months
Contributions summary:Jeffery primarily contributed to the background-size-polyfill project by addressing and fixing JavaScript errors related to background-position. They also integrated changes from other contributors, adding empty alt attributes to images for accessibility. Furthermore, they made improvements to the code, including refactoring the code to call handlePropertychange() in init() and adding support for dynamic changes to background images. These efforts aimed to enhance the functionality and address compatibility issues of the polyfill for IE8.
ie8gradientsbackground
openwrt/packages
Oct 2015 - Jul 2022
Community maintained packages for OpenWrt. Documentation for submitting pull requests is in CONTRIBUTING.md
Role in this project:Back-end Developer & Python Package Maintainer
Back-end Developer & Python Package MaintainerContributions:304 reviews, 760 commits, 1055 PRs in 6 years 9 months
Contributions summary:Jeffery primarily worked on maintaining and enhancing the Python packages within the OpenWrt repository. They focused on updating Python packages, particularly those related to cryptography and network protocols, to newer versions and refreshing the associated patches. The contributions involved fixing build issues, addressing security vulnerabilities, and adding support for newer Python versions and build processes. Moreover, the user added a range of new Python packages, including those related to security, dependency management, and network programming.
openwrt
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