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Experience
Founding Engineer
PensiveJun 2026 — Present · San Francisco Bay Area
Founder
StealthSep 2025 — Mar 2026 · Seoul, South Korea
Frontend UX Engineer
Viva Republica (Toss)Dec 2021 — Aug 2025 · Seoul, South Korea
Built DEUS, a DOM-based design editor, and led technical architecture across design components, UI systems, and code generation. Developed use-funnel, an internal library adopted by 100+ engineers that became the open-source @toss/use-funnel. Shipped multiple web products including Homeloan Silo for mortgage comparison and lending, Toss News, and seasonal donation features.
Frontend Engineering Lead
지엔터프라이즈(비즈넵)Jun 2020 — Dec 2021 · Seoul, South Korea
Led the Web Frontend Chapter, establishing technical standards and overseeing migration from Angular to React. Introduced Micro-Frontends Architecture using Webpack 5 Module Federation, reducing build times and operational costs. Developed and maintained products with Angular, Ionic 5, RxJS, and GraphQL.
S
CTO / Co-Founder
Student MachinesAug 2025 — Present · San Francisco, CA / Seoul, South Korea
Co-founding and leading technical direction for an early-stage startup building developer tooling and web products.
Education
Chung-Ang University
학사 in 소프트웨어학부
Mar 2019 — Mar 2027
GPA: 3.97/4.5. Admitted as top student in the early admissions process.
Projects
D
DEUS
DOM-based design editor replacing legacy Framer tooling
Built and led technical decision-making for a production design editor handling design components, prototypes, UI architecture, migration scripts, canvas rendering, ESM resolution, and streaming JSON. Rebuilt the Code Generator that transforms designs into production-ready React, iOS, and Android code.
u
use-funnel
Internal frontend library for building and managing application flows
Built and released as open-source @toss/use-funnel. Simplifies building and managing application flows across the organization.
H
Homeloan Silo
Web product for mortgage comparison and lending
Developed web product enabling users to compare mortgage interest rates and terms across financial institutions and apply for loans directly.
M
Micro-Frontends Architecture
Webpack 5 Module Federation implementation
Introduced Micro-Frontends Architecture using Webpack 5 Module Federation across web products. Presented findings at FEConf 2021.
C
Collaborative Learning Web Application
Machine learning-based learning platform
Developed a machine learning-based collaborative learning web application using TensorFlow.js and WebSocket to analyze user engagement and evaluate learning effectiveness.
Credentials
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Skills
JavaScriptReactAngularReact.jsTypeScript반응형 웹 디자인자바스크립트HTML5GitJavaCNext.jsMobXRecoilXStateIonic 5RxJSWebpackRollupESBuildWebpack 5 Module FederationGraphQLWebSocketTensorFlow.jsDesign ToolingCode GenerationMicro-FrontendsWeb Architecture