I'm a frontend developer with 3 years of experience who understands problems from the user's perspective and turns business requirements into stable products. I've built experience across diverse environments—from global B2B SaaS booking and website builders to AI content web and kiosk clients. Beyond core feature development, I've worked on performance optimization, internationalization, legacy modernization, and Electron application development with integrations for payment modules, printers, and other external systems.
I don't stop at implementing features to spec—I consider the user journey and operational environments together. I balance usability, maintainability, and operational stability, collaborating with planning, design, backend, QA, and operations to propose better technical solutions. I aim to be a frontend developer who raises both product quality and team development efficiency by balancing user needs, business goals, and technology.
EXPERIENCE
2025.08 ~ Present
Millennials Works
FrontEnd & Application Client Developer
- Designed and built Electron + Next.js kiosk clients (IPC communication, logging, device auth, JSON-based per-store configuration)
- Implemented global i18n and locale-aware date/time formatting with next-intl and dayjs
- Improved unmanned operation stability with WatchDog, kiosk mode, and scheduled shutdown
- Integrated kiosk hardware: photo, card, and POS receipt printers
- Built accessible kiosks with Windows TTS and Electron Two Screen support
- Integrated KICC payment module for payments, refunds, and cardless refunds
- Built customized RustDesk remote management client and kiosk back-office for sales and device monitoring
- Led migration from external SaaS AI music generation to open-source ACE-STEP 1.5 Turbo, eliminating operating costs
2023.03 ~ 2024.12
Cloud Hospital
SaaS / Platform Frontend Developer
- Built cloud-based website builder SaaS frontend (page editor/renderer, dynamic forms with react-hook-form useFieldArray)
- Developed and enhanced global hospital consultation booking (framer-motion interactions, contributed to growth from ~50 to 1,000+ clients)
- Migrated legacy stack (Redux → SWR + Context API, Formik → React-Hook-Form) and split 1,000+ line components
- Reduced First Load JS bundle size by ~46% with dynamic import and tree shaking
- Improved SSR parallel API calls, cutting initial HTML load by ~33% (1.79s → 1.2s)
- Supported LTR/RTL with CSS Logical Properties and automated 10+ language translations via GPTs
- Applied SSG with On-Demand Revalidation and fixed Azure Search sitemap logic (~5% missing entries recovered)
AWARDS
ACTIVITIES
2025.01 ~ 2025.02
DND 12th Team 4 Lead
Joined as Team 4 lead after winning the Hackathon Free Pass Special Award. Led the 'Picki talki' walkie-talkie diary platform from planning to deployment over 8 weeks, with offline final presentation and booth operation in collaboration with Yapp.
2022.02 ~ 2023.01
Hansei University Web Dev Club 'Potato Club' 3rd & 4th Term
Served as frontend developer and treasurer, contributing to club project development and operations.
SKILLS
Front-End
HTML/CSS, JavaScript, TypeScript, React, NextJS, Electron, Styled-Components, Tailwind CSS, Context API, Zustand, Recoil, React-Query, SWR, OpenAPI Generator, Orval, React-Native, Flutter
Deploy
AWS, Vercel
Etc
Figma, Postman, Slack, Notion, Git
LET’S TALK
CONTACT ME
woalswhwh@gmail.com
FOLLOW ME
FrontEnd Developer KoJaem
FrontEnd Developer KoJaem
FrontEnd Developer KoJaem
FrontEnd Developer KoJaem