Latest Posts

Sharing the experience of reducing bundle size from 547KB to 97KB (approximately 82%) by changing the lodash import method in a monorepo environment. Covers the entire process from setting up bundle analysis to preventing recurrence with ESLint rules.

Learn about the cause of the "Argument list too long" error that occurs when there are many changed files in monorepo CI, and how to solve it by switching from Bash to JavaScript (actions/github-script).

Learn how to implement a GitHub Actions workflow that automatically validates whether changed files in a PR fall within the corresponding service directory based on the branch name in a monorepo.

Learn how to run ESLint only on changed files in CI to introduce new ESLint rules without friction in a large-scale monorepo.

Let's learn how to work in parallel across separate directories using Git Worktree.

Let's learn the basics of Claude Code, from installation to tokens, models, modes, and useful tips.

Let's learn about the PnP concept — creating and managing sub-projects within a main project — and how to adopt it.

A summary of the core concepts of React Clean Code — Cohesion, Single Responsibility, and Abstraction — presented at Toss's SLASH 21 conference, with practical code examples.

Learn what React rendering is, the difference between the Render Phase and Commit Phase, Fiber objects, Keys and rendering, batch processing, closures and state snapshots, and more about the basic concepts and behavior of React rendering.

Learn why rendering performance optimization matters in React, how to use optimization APIs like React.memo, shouldComponentUpdate, and PureComponent, how to fix reference issues with useCallback/useMemo, immutability, how to measure performance, and the React Compiler.

Sharing the methods applied to improve Lighthouse performance scores on an Astro blog, including image optimization, CSS optimization, web font optimization, and accessibility improvements.

I share my experiences and lessons learned while working on side projects as a developer.