CHA HYUNWOO

Developers who are good at communicating and collaborating

Seoul, Korea

profile

BRIEF INTRODUCTION

I am a developer who is flexible and easy to adapt to any situation. I like to write code that increases productivity.I try to write code that takes 10 minutes today, but takes 5 minutes tomorrow.

EDUCATION

  • Soongsil University

    2011 - 2017
    Bachelor of Accounting, Computer Science Minor

  • ACBS

    2024 - 2025
    Bachelor of Computer Science

SKILLS

RECENT EXPERIENCE

Financial Back-Office System Development (Fintech)

2025 - Now

FE Developer / Freelancer

  • Designed and built Feature-First Architecture based on React 19 + TypeScript + Vite, establishing domain-centric modular structure

  • Built TanStack Router file-based routing system and eliminated page transition loading through Route Loader data prefetching

  • Implemented architecture for complete separation of server/client state management using TanStack Query + Zustand combination

  • Applied babel-plugin-react-compiler for automatic memoization optimization and reduced unnecessary re-renders

  • Ensured runtime/compile-time type safety through TypeScript strict mode + Zod schema integration

  • Implemented large-scale data virtualized tables and infinite scroll pagination using TanStack Table + TanStack Virtual (reused across 5+ pages)

  • Developed complex multi-step form validation system by integrating React Hook Form + Zod resolver

  • Built real-time statistics data streaming system based on Server-Sent Events (SSE) and synchronized with TanStack Query cache

  • Implemented JWT-based authentication system and applied hybrid token storage strategy using Cookie + LocalStorage

  • Developed 2FA OTP authentication flow and implemented Route Guard based on TanStack Router beforeLoad hook

  • Implemented HTTP client abstraction layer based on ky and automated business error handling through middleware

  • Built accessibility-compliant reusable component library based on shadcn/ui + Radix UI

  • Built dark/light mode theme system based on next-themes

  • Developed useMediaQuery custom hook for automatic responsive layout switching and mobile-optimized UX patterns

  • Built integrated linting/formatting environment based on Biome and applied automatic Tailwind CSS class sorting

  • Built automated validation pipeline before commits through Git Hooks automation using Husky + lint-staged + commitlint

  • Built interactive commit process based on Commitizen to comply with Conventional Commits standards

  • Designed 3-tier Git branch strategy: main(Production) ← dev(Staging) ← develop(Development) ← feature/* and built Pull Request templates

  • Systematized architecture principles, coding conventions, and Git workflows through README.md project documentation

Frontend Developer Freelancer

2025

FE Developer / Freelancer

  • Participated in comprehensive development processes from initial project design to product launch as a freelance frontend developer

  • Developed service guide UI for Next.js-based projects using React Joyride

  • Built front-end interfaces for financial back-office projects using React, TypeScript, and Styled-Components

  • Developed design systems and shared component libraries in enterprise environments using Figma and Storybook

LG Electronics webOS TV App Shoptime 2.0 Operation and Maintenance

2024 - 2025

FE Developer / PL

  • Jenkins CI/CD pipeline construction and optimization of automated build/deployment processes

  • Enhancement of multi-language support (US, Germany, Russia, UK) and integration management of i18n framework

  • WCAG 2.1 standard-based UI/UX accessibility enhancement and screen reader compatibility improvement

  • Structured logging system construction for real-time monitoring and error tracking infrastructure enhancement

  • Integration of new payment system and PG company API for payment conversion rate improvement

  • Agile methodology-based weekly sprint meeting and issue tracking system management using JIRA

  • Deep analysis of webOS luna API and design of optimized integration methods for maximizing TV hardware resource utilization

  • Performance optimization for application loading time reduction by 30% and user experience improvement

LG Electronics webOS App LG Shoptime 2.0 Enhancement

2024

FE Developer / PL

  • Architecture design from architecture design to production release as a lead frontend developer, selection of technical stack and development process construction

  • Design of scalable state management architecture using Redux ecosystem (redux-thunk, redux-saga)

  • Build modular styling systems with SASS/LESS to improve development productivity and maintenance

  • Establishment of OpenAPI(Swagger) based API documentation standard and optimization of collaboration process with backend development team

  • Build automated API test environment using Postman and integration of CI/CD pipeline

  • Establishment of Git-flow based development workflow and standardization of code review process

  • Build design-development collaboration system using Zeplin, Figma and design system introduction

LG Electronics ThinQ App

2023

FE Developer

  • Design of cross-platform webview architecture based on React and performance optimization for app loading speed improvement by 40%

  • Build enterprise-level component library and interactive documentation using Storybook for developer experience improvement

  • Development of real-time data visualization dashboard using d3.js and optimization for user insight enhancement

  • Analysis of issues due to differences in browser engines between iOS/Android platforms and implementation of adaptive rendering logic

  • Enhancement of type stability using PropTypes and TypeScript and reduction of runtime errors by 85%

  • FUT(Functional Under Test) environment construction for component stability test automation and quality assurance

  • Establishment of Notion-based technical documentation system and management for knowledge sharing culture enhancement in the team

  • Leadership of weekly code review sessions and establishment of coding standard guidelines for code consistency maintenance

  • Optimization of Jira and Git workflow for simplified development-QA-deployment process

  • Experience in multi-department collaboration in large enterprise environment and effective communication skills in complex decision-making structure