Jeffery T - Founder at Yarn Labs

Jeffery T

Founder at Yarn Labs

Hong Kong, China

Join Prog.AI to see contacts

Summary

🤩

Rockstar

🎓

Top School

Jeffery 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.

16 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

Stats

11,886reputation

1.9mreached

146answers

0questions

Badges

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

kernel-module10

backward-compatibility10

Programming languages (15)

C#C++CSSBikeshedCRustMakefileGo

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

Contributions: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

Contributions:303 reviews, 760 commits, 1054 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.

pull-requestsopenwrtstudio

Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.

Request Free Trial