Hi, I'm Youngjae 👋

Full-stack developer who builds products users can't live without. Bridging the gap between functional programming and modern web development.

🔗 Contact

• Email: [email protected]
• Resume: BitYoungjae | 개발이 행복한 개발자

💡 What I Do

I specialize in building production-grade web applications with a unique blend of functional programming (Clojure/ClojureScript) and modern TypeScript ecosystems. Currently shipping inventory management solutions used by thousands of businesses.

My sweet spot: Complex state management, real-time systems, and developer tooling.

🚀 Featured Project

BarBrew · Barcode Generator

Browser-based GS1 barcode generator for testing and development

• Impact: Solves a real pain point for developers testing barcode workflows
• Tech Highlights: Astro Islands Architecture, React 19, Zustand state management
• Features: Multi-format generation, CSV bulk import, GS1 AI configuration, offline-capable
• UX: Real-time preview, template variables, interactive HTML export

💼 Professional Experience

BoxHero · Full-stack Developer

Jan 2023 ~ Present | Sep 2020 ~ Aug 2022

Building BoxHero - a global inventory management platform that simplifies stock control and tracking for businesses. The platform delivers real-time inventory tracking, barcode scanning, order management, and detailed analytics across web, mobile (iOS/Android), and desktop applications, serving 4000+ businesses worldwide with multi-language support

Key Achievements:

• Architected full-stack features using Clojure/ClojureScript + Re-frame
• Built cross-platform desktop app (Electron) with 60+ GitHub stars
• Developed PDF generation microservice handling 10k+ documents/month
• Maintained Next.js landing page with i18n support (10+ languages)
• Created internal CLI tools for automated i18n translation workflows

Tech Stack:

• Frontend: ClojureScript, Re-frame, React, Next.js, TailwindCSS
• Backend: Clojure, Ring, PostgreSQL, HugSQL
• Desktop: Electron, TypeScript
• DevOps: Docker, GitHub Actions, AWS

AnnotationAI · Frontend Developer

Sep 2022 ~ Jan 2023

Built annotation tools for AI training data labeling

• React & Vue.js development
• TypeScript + Styled Components

🛠 Technical Expertise

Languages & Runtimes

• Primary: TypeScript, JavaScript (ES2020+)
• Functional: Clojure, ClojureScript
• Runtime: Node.js 20+

Frontend Engineering

• Frameworks: React 19, Next.js 15, Astro 5
• State: Zustand, Redux (Toolkit/Saga), Re-frame (ClojureScript)
• UI/Styling: shadcn/ui, Radix UI, Tailwind CSS v4, Framer Motion
• Desktop: Electron (production apps with code signing & auto-updates)

Backend & Data

• API: Nest.js, Hono, REST, OpenAPI
• Database: PostgreSQL, Drizzle ORM, Prisma, HugSQL
• Queue: Bull Queue + Redis

Developer Experience

• Build: Vite 7, Astro, Webpack, SWC, Rollup
• Monorepo: Turborepo, Nx, pnpm workspaces
• Quality: TypeScript strict mode, ESLint 9, Prettier, Husky
• Testing: Vitest, Jest, Playwright
• Validation: Zod 4

Specialized Skills

• i18n: i18next, custom translation tooling
• AI Integration: OpenAI API, DeepSeek API
• PDF Generation: @react-pdf/renderer (10k+ docs/month)
• CLI Tools: Commander, Ora (published internal tools)

📊 GitHub Activity