SungHyun Kim

Developed utilities to improve team productivity and development environment

• Built a tool to automate documentation of insurance terms used in API specs, reducing documentation time
• Developed a verification tool to compare input data with a glossary of insurance terms and shared it with the team
• Developed and shared React Query-based custom hooks to interface with internal WebSocket APIs

Implemented pages to meet client requirements

• Developed insurance application/processing pages and common UI components.
• Built a custom time picker to meet specific client requirements.

Blog Implementation

• Built the blog using Next.js 12, maintaining and upgrading it to accommodate RSC updates.
• Created custom remark plugins for generating TOC and automating image path rewriting within Markdown.
• Enhanced SEO by implementing OG image generator, metadata management, sitemap, and RSS feed.
• Introduced ESLint 9 Flat Config and documented the migration process. Article

Improving User Experience

• Built an AI-based automatic translation system to support English, improving global accessibility. Article
• Implemented automatic language switching and configured SEO for multilingual content. Article
• Optimized page performance, raising Lighthouse scores from 75 to 95.

Frontend Development

• Migrated the codebase from Next.js 10 + JavaScript to Next.js 12 + TypeScript.
• Refactored legacy code through discussions with original authors, considering current needs and future scalability.
• Replaced fragile DOM API-based code with React-based implementations for better maintainability.
• Introduced Radix UI components to unify and streamline common elements.

Backend Development

• Developed an API server handling student management, attendance tracking, assignment submissions, and lecture fee calculations.
• Migrated backend systems from Go and raw SQL to Node.js, TypeScript, and Prisma ORM for maintainability.
• Built a Discord bot for online attendance tracking using discord.js and integrated it with the server.

• Frontend Meetup Presentation - "Starting Networking My Way"
• Selected by Naver FE News (Feb 2024) for an article about special comment formats in JavaScript.
• Deep dive article tracing the history of closures from Turing machines to JavaScript.
• Introduced velite, a content management library.
• Explained type variance through TypeScript, selected in Geultto 9th term.

• Presentation: Clarifying common misconceptions in computer, network, and web history.
• Presentation: How to sustain blogging for the long term and write better articles.
• Presentation: The early history of JavaScript and its design decisions.

• Fixed historical errors in MDN English documents.
• Translated MDN legacy JavaScript documentation into Korean.
• Translated and published a 120-page paper on the history of JavaScript.

• Presentation at GDG on Campus Hongik Univ.: What I Learned from the SW Maestro Program.
• Presentation at GDG on Campus Hongik Univ.: Setting Career Paths as a Developer.
• Conducted a winter algorithm camp lecture for ~100 university students in Sinchon. Lecture Materials
• Organized the Sogang Programming Contest (SPC) as part of the student committee. Contest Page
• Served as an executive member of the Sogang University algorithm club, organizing study sessions and programming contests.