Frontend Developer (4 years)

Frontend developer with experience in designing and operating global-scale services. I focus on data-driven decision making and quantifiable outcomes, constantly striving to improve user experience.

• 🌍 Global Scale: Designed i18n system supporting 50 countries and 40 languages, managing 2,000 locale combinations
• 📊 Quantifiable Results: 60% code reduction with React Hook Form, 60% faster page loading with TanStack Query optimization
• 🔧 Performance Optimization: 60% increase in payment completion rate (55% → 88%) through Google Analytics-based data-driven UX improvements
• 🤝 Open Source: Top 20 contributor to react-hook-form (15M+ weekly downloads)

High-Performance Policy-First Image Optimization Engine

A policy-driven image optimization engine that puts business logic at the center and optimizes images through explicit orchestration.

🔧 Tech Stack: TypeScript, Sharp, AWS S3, Cloudflare R2, Google Cloud Storage, Azure Blob Storage ⭐ Key Features:

• Policy-based image transformation and optimization
• Multiple storage adapter support (S3, R2, GCS, Azure, Local)
• Express.js & Next.js middleware included
• Zero vendor lock-in with pluggable architecture

📊 Achievements: Monorepo structure design, 6 storage adapters implementation, MIT license distribution

Recipe Sharing and Management Platform

A platform where users can create, share, and search for recipes from other users

🔧 Tech Stack: React, TypeScript, Node.js ⭐ Key Features:

• Recipe CRUD functionality
• User authentication and authorization
• Recipe search and filtering

Simpson Character Search and Information Service

A service to search for and view detailed information about Simpson animation characters

🔧 Tech Stack: React, TypeScript, REST API ⭐ Key Features:

• Character search and filtering
• Character detail information display
• Responsive UI design

Popular form management library with 15M+ weekly downloads

Major Contributions:

• PR #12932: Improved FieldArrayPath types - Enhanced type safety for nested array fields
• PR #12934: Updated ErrorOption types - Improved type accuracy for error handling logic
• PR #12940: Enhanced FieldArrayPath edge case handling
• PR #12967: Optimized form state management logic
• PR #13120: Expanded test coverage - Added test cases for array fields

Google Gemini CLI tool with 300K+ weekly downloads

Major Contributions:

• PR #4287: Improved CLI command test code quality
• PR #4575: Enhanced input validation logic and error handling
• PR #14701: Enhanced error handling for MCP client manager initialization to prevent crashes

Sep 2024 - Present (1 year 4 months)

• 60% faster page loading (5s → 2s) through TanStack Query optimization
• 60% code reduction (2,500 lines → 1,000 lines) in form management with React Hook Form
• 70% faster content registration (10-15min → 3-5min) by improving UX for 40-language multilingual forms
• Designed i18n system supporting 50 countries × 40 languages (managing 2,000 locale combinations)
• Eliminated deployment conflicts (0 incidents in 1 year) by establishing branching strategy in monorepo environment

• 60% increase in payment completion rate (55% → 88%) through Google Analytics-based funnel analysis
• 50% reduction in development effort by leading Vue → React migration
• Ensured WCAG & EAA accessibility standards compliance for global regulatory requirements

Sep 2021 - Aug 2023 (2 years)

• 83% faster page loading (1min → 10s) through query optimization and pagination implementation via backend collaboration
• 40% code reduction and improved maintainability by leading jQuery → Vanilla JS migration
• 90% reduction in work hours (10 man-days/month → 0.5 man-days/month) by automating billing data recovery through Socket communication stabilization

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