Sangyeob Yu
프론트 엔드 개발자 at Toss
Seoul, South Korea
Summary
🤩
Rockstar🎓
Top SchoolSangyeob Yu is a seasoned front-end engineer and leader with 12 years of experience building production-grade web and mobile interfaces, currently working at Toss in Seoul. He has progressed through technical and executive roles—CTO, VP of Software Development, Frontend Team Lead and Principal Frontend Developer—demonstrating both hands-on coding and organizational leadership. Deeply skilled in React.js, React Native, Next.js and TypeScript, he contributes to high-profile open-source projects like facebook/react-native, improving platform integration for Android and iOS. His background spans startups and healthcare AI at Lunit, where he helped ship complex front-end systems that bridge clinical workflows and product delivery. Comfortable mentoring teams and shipping cross-platform apps, he pairs a CS degree from Yonsei with a practical focus on robust developer experiences. A less obvious strength is his long-term habit of contributing small but impactful fixes to major open-source repos, showing attention to integration details that improve real-world deployments.
11 years of coding experience
13 years of employment as a software developer
BS, Computer Science, BS, Computer Science at 연세대학교 / Yonsei University
English
Stackoverflow
821reputation
85kreached
23answers
0questions
Github Skills (16)
javascript10
ios10
react-native10
mobile-development10
android10
react9
webview9
android-webview9
cross-platform9
app-framework8
html6
css6
jquery6
anonymous-functions6
scopes6
Programming languages (6)
Github contributions (5)
facebook/react-native
Nov 2015 - Jul 2016
A framework for building native applications using React
Role in this project:
Mobile Developer (Android/iOS)
Mobile Developer (Android/iOS)Contributions:10 commits, 11 PRs, 48 comments in 8 months
Contributions summary:Sangyeob primarily contributed to the React Native framework, focusing on both Android and iOS platforms. Their work includes fixing typos, adding support for Universal Links on iOS, and setting the encoding to UTF-8 for Android web views. Further contributions involved modifying the `onDropViewInstance` method in the Android UI Manager and adding and updating applications showcased on the website, demonstrating a focus on improving platform integration and application examples.
reactnative-applicationsmobile-developmentreact-nativeandroid
deminoth/google-font-kor
Jun 2014 - Sep 2015
Contributions:19 commits, 4 pushes in 1 year 3 months
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