Jihwan Kim

Built B2B groupware SaaS, a global commerce platform, and internal operations tools across user interfaces, real-time communication, operator workflows, and delivery infrastructure.

• Moved NFC badge and menu operations from developer database edits to operator self-service
• Reduced chat-room creation from 6s to 0.1s and duplicate IPC listeners from 134 to 15
• Refactored 800+ i18n usages and reduced Storybook builds from 28.9s to 13.9s

Built the tebekAI image-processing SaaS in a two-person team, covering image workflows, authentication, payments, and administration.

• Delivered five AI image-processing services and their shared workflow
• Implemented Toss Payments credit payments and user/admin authorization
• Integrated Korean National Police and Kakao Search APIs

Designed and built a full-stack game platform where independent web games connect through a shared integration protocol.

• TypeScript
• React
• Next.js
• NestJS
• Prisma
• PostgreSQL
• Socket.IO
• Canvas

• Designed an iframe + postMessage game integration protocol
• Built a Next.js, NestJS, Prisma, and PostgreSQL full-stack architecture
• Implemented Socket.IO matchmaking, multiplayer, and rankings
• Handled Canvas game loops and deterministic state
• Created a boilerplate for consistent new-game scaffolding
• Released Kaboom, Handle, Mythology Defense, and Nemo Nemo Puzzle

Built business domains and an Electron chat app, improving data retention, response time, application structure, and release reliability.

• React
• TypeScript
• React Query
• Zustand
• Electron
• Socket.IO
• IPC
• Playwright
• GitHub Actions
• AWS

• HR, attendance, approval, ERP, CRM, and PMS interfaces
• Automatic approval-draft saving
• Refresh Token migration to httpOnly cookies
• Chat-room creation: 6s → 0.1s
• IPC listener registrations: 134 → 15
• FCP: 3.1s → 2.2s
• GitHub Actions and S3/CloudFront release pipeline
• Windows code signing and macOS notarization

Built search, transaction, real-time chat, localization, and search-discovery systems for a global cross-border commerce platform.

• Next.js
• React
• TypeScript
• React Query
• Tailwind CSS
• next-intl
• STOMP
• tiptap
• Storybook
• JSON-LD

• Unified product and supplier search
• B2B quotation and settlement PDF/Excel generation
• STOMP 1:1 chat with a WebSocket-specific token
• i18n namespace and CI validation
• Plate.js to tiptap editor migration
• Three-language SEO and metadata rules

Proposed, built, and deployed an Electron tool that enabled HR and cafe operators to manage employee badges and menus without developer intervention.

• Electron
• TypeScript
• IPC
• REST API
• NFC
• macOS Notarization

• NFC-based employee badge registration
• Member, badge, and menu CRUD
• Electron, REST API, and hardware integration
• macOS packaging and notarization

Built upload, processing, results, authentication, payment, and operations flows for an AI image-processing SaaS in a two-person team with a designer.

• React
• JavaScript
• React Query
• React Router
• Axios
• Recharts
• Toss Payments
• CSS Modules

• Five AI image-processing experiences
• Shared upload-processing-result components
• Credit payments with Toss Payments
• User and admin authorization

Built a Chrome Extension, landing page, and Markdown parser for a developer-focused GitHub management service.

• Next.js
• React
• TypeScript
• Chrome Extension API

• Chrome Extension development and Web Store release
• README parser converting GUI output into Markdown
• Landing page and GitHub-integrated user flow

Cohort 8 · Web Development

Completed web development training and team projects with Java, JavaScript, MySQL, Spring, and React.