Notes on design, engineering, and building products.https://37108.dev/enhttps://dev.classmethod.jp/en/articles/do-not-let-ai-implement-ui-by-guesswork/https://dev.classmethod.jp/en/articles/do-not-let-ai-implement-ui-by-guesswork/The cost of "drawing" designs with AI has decreased. However, to create a "functional UI" beyond that, the "thinking work" of putting purposes and user behavior into words is essential. In this article, we will explore how to organize the prerequisites that should be handed over to AI.Mon, 31 Aug 2026 07:02:43 GMThttps://dev.classmethod.jp/en/articles/learn-about-project-management/https://dev.classmethod.jp/en/articles/learn-about-project-management/I realized that the essence of project management is not perfect prediction, but rather creating a state where you can continuously observe your current position and outlook while facing uncertainty and anxiety. I will summarize what I have learned, including the parts where I failed when applying it in practice.Wed, 26 Aug 2026 01:40:42 GMThttps://dev.classmethod.jp/en/articles/self-hosted-runner-with-mbp/https://dev.classmethod.jp/en/articles/self-hosted-runner-with-mbp/AI increasing the amount of code has made CI e2e test execution time a headache. After considering building a runner on AWS, we ultimately arrived at a solution of virtualizing our on-hand MacBook Pro with Lima and utilizing it as a self-hosted runner. We will introduce that implementation and the ingenuity behind it.Thu, 06 Aug 2026 02:58:39 GMThttps://dev.classmethod.jp/en/articles/ai-era-docs-tsumugu/https://dev.classmethod.jp/en/articles/ai-era-docs-tsumugu/In AI-assisted development, there are more opportunities to write documents such as design documents and specifications. However, simply placing Markdown files does not provide a surprisingly good "reading" experience. So I created a tool called "Tsumugu" that allows you to publish Markdown, HTML, MDX, and OpenAPI as a readable documentation site with zero configuration. In this article, I will introduce the background of its development, the design centered around Semantic AST, and the development style in the AI era.Mon, 03 Aug 2026 01:42:43 GMThttps://dev.classmethod.jp/en/articles/react-implement-at-work/https://dev.classmethod.jp/en/articles/react-implement-at-work/I have compiled React implementation patterns encountered during work. I'll explain how to make Server Components coexist with Context API, how to determine SSR with useIsSSR, the render hooks pattern, and modal implementation in Next.js.Tue, 14 Oct 2025 17:31:59 GMThttps://dev.classmethod.jp/en/articles/refactoring-developersio-performance/https://dev.classmethod.jp/en/articles/refactoring-developersio-performance/I worked on improving Core Web Vitals for DevelopersIO and enhanced the performance and accessibility scores in Lighthouse. I'll introduce specific measures such as LCP optimization, CLS reduction, image optimization, and bundle size reduction.Thu, 09 Oct 2025 07:24:31 GMT