Hyeonseok Yang
Frontend Developer at Devsisters
Seoul, South Korea
Summary
👤
Senior🎓
Top SchoolHyeonseok Yang is a seasoned Frontend Developer with 11 years of experience based in Seoul, specializing in React and TypeScript and currently contributing at Devsisters. He has led frontend teams and shipped complex, animation-rich marketing pages, back-office systems, and coupon/commerce features across companies like Qualson and Makeus Mobile. Comfortable from prototyping to production, he emphasizes clean architecture, code reviews, and close collaboration with product and marketing teams. An active open-source contributor, he improved Korean locale handling in the widely used moment.js library—demonstrating attention to internationalization and testing nuances. With a background that includes a non-degree CS program at NHN NEXT and a civil engineering degree from Seoul National University, he brings analytical rigor and a learn-anything mindset to frontend engineering. He explicitly avoids blockchain projects and prefers roles focused on pragmatic, user-facing web applications.
11 years of coding experience
8 years of employment as a software developer
Bachelor's degree Civil Engineering, Bachelor's degree Civil Engineering at Seoul National UniversityNon-degree education Computer Science, Non-degree education Computer Science at NHN NEXT
English, Korean
Stackoverflow
721reputation
38kreached
5answers
15questions
graphql
top-5%
Github Skills (21)
date-formatting10
javascript10
internationalization10
date-format10
momentjs10
time-format10
localization10
lang10
anylanguage10
datetime-format10
graphql9
testing8
camera6
flowtype6
generics6
Programming languages (7)
Github contributions (5)
moment/moment
Mar 2017 - Aug 2017
Parse, validate, manipulate, and display dates in javascript.
Role in this project:
Localization / Internationalization Specialist
Localization / Internationalization SpecialistContributions:5 commits, 1 PR, 4 comments in 4 months
Contributions summary:Hyeonseok primarily contributed to the Korean locale files within the moment.js library. Their work involved fixing testing issues related to ordinal month formats, updating weekly ordering tests, and modifying the `ordinal` function to correctly format Korean date strings. They also updated the code based on the existing zh-cn locale file for a better implementation. These changes focused on adapting the library for proper Korean date and time formatting.
validationnpm-packagejavascriptnodejsdates
FourwingsY/portfolio
May 2021 - Dec 2022
Contributions:151 commits, 114 pushes, 1 branch in 1 year 6 months
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