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Klimt / Ktown4u K-pop 이커머스 프론트엔드에서의 역할·성과를 영문으로 압축 정리한 문서입니다. 채용 담당자나 협업 파트너가 범위와 임팩트를 빠르게 파악할 수 있도록 쓰였습니다.

Frontend Developer - Klimt (Ktown4u E-commerce Platform)

November 2022 - Present (3+ years) K-pop Merchandise E-commerce Platform - Multi-region (KR, JP, CN, EN)

Project Overview

• Joined 3 weeks after project inception as one of the founding frontend developers
• Largest contributor with 3,109 commits (~70K+ lines of code)
• Built Next.js-based e-commerce platform from scratch to gradually replace legacy PHP system
• Supported 4 regional stores with full i18n and multi-locale architecture

Tech Stack

• Frontend: Next.js 15 (Pages Router), React 19, TypeScript
• State Management: Jotai, Apollo Client (GraphQL), React Query
• Styling: Tailwind CSS, Radix UI, CVA (Class Variance Authority)
• Testing: Jest, Playwright, Testing Library, Storybook
• Infrastructure: Docker, AWS (SSM), Datadog RUM, GitHub Actions
• Tools: pnpm, i18next, Swiper, Formik, Yup

Key Technical Achievements

Architecture & Patterns

• Services-based folder structure for scalability
• Atomic design patterns with reusable components
• Custom hooks for business logic separation
• Apollo Client cache optimization (no unnecessary refetches)
• Optimistic UI updates for better UX
• Error boundaries with graceful fallbacks

Performance Optimization

• Infinite scroll with intersection observer
• Image lazy loading and skeleton states
• Code splitting and dynamic imports
• Bundle optimization with tree shaking
• CDN integration for static assets

Developer Experience

• Storybook for component documentation
• Comprehensive testing (unit + E2E)
• ESLint + Prettier with automated formatting
• TypeScript strict mode enforcement
• Git hooks with lint-staged

DevOps & Monitoring

• Datadog RUM for real-time monitoring
• Feature flags for gradual rollouts
• Environment-specific configs (dev/stage/prod)
• Automated CI/CD with GitHub Actions
• Docker containerization for deployments

Code Contribution Statistics

Total Changes: ~70,000 lines of code (35,868 additions, 34,124 deletions)

Business Impact

User Engagement

• Review system enabled community-driven product discovery
• Push notification infrastructure supported targeted marketing campaigns
• Device mapping enabled user segmentation for personalized experiences

Global Expansion

• Full i18n support enabled 4-region operations (KR, JP, CN, EN)
• Multi-locale event system supported region-specific promotions
• Geo-restriction system ensured compliance with regional regulations

Mobile-First

• Universal links provided seamless web-to-app transitions
• Responsive design supported 80%+ mobile traffic
• Touch-optimized interactions improved mobile conversion rates

Security & Reliability

• Authentication refactoring eliminated token security vulnerabilities
• Type-safe codebase reduced runtime errors by 60%+
• Comprehensive testing prevented regression bugs in production

Technologies Used

Core: Next.js, React, TypeScript, JavaScript (ES6+)

State: Jotai, Apollo Client, React Query, Context API

Styling: Tailwind CSS, CVA, Radix UI, CSS Modules

Data: GraphQL, REST APIs, Axios

Testing: Jest, Playwright, Testing Library, Storybook

Tools: Git, pnpm, Docker, AWS, Datadog, Unleash

Mobile: Universal Links, Deep Linking, NachoCode SDK

i18n: next-i18next, i18next-browser-languagedetector

Project Milestones Delivered

• Platform foundation (Nov 2022)
• Review system v1 (Mar 2023)
• Product list & cart (Apr 2023)
• Chart integration (Jun 2023)
• Main page redesign (Sep 2023)
• Nacho app integration (Apr 2024)
• Authentication refactoring (Sep 2024)
• Push notification infrastructure (Oct 2024)
• MyPage redesign (Jan 2025)
• Ongoing maintenance & optimization (Present)

Summary: As a founding member of the Klimt project, contributed to building a production-scale Next.js e-commerce platform from scratch, with expertise spanning architecture design, state management, mobile integration, performance optimization, and production stability.

마무리

• 위 요약은 초기 구축부터 프로덕션 운영까지의 역할을 한눈에 보기 위한 것입니다. 시기별 세부 작업은 work_2023, work_2024, work_2025 문서와 함께 보시면 타임라인이 잘 이어집니다.
• 스택·지표는 작성 시점 기준이므로, 실제 레포·릴리즈와 함께 확인하는 것이 가장 정확합니다.