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Short, practical videos on full-stack development, AI, developer tools and emerging technology — searchable by topic.

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  • Thumbnail for “How Postgres finds 1 row in 10 million”

    I put 10 million orders into Postgres 18.6 and looked up one email.

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  • Thumbnail for “Junior vs senior prompt: same app, same Claude Code”

    I gave Claude Code the same Next.js task twice: a one-line prompt, and a prompt that says which files to touch, no new packages, and what "done" means.

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  • Thumbnail for “How Claude skills actually work (I logged the requests)”

    312,000 people starred obra/superpowers, which is basically a folder of markdown.

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  • Thumbnail for “Is your API key public? The NEXT_PUBLIC_ mistake AI makes”

    AI tools often "fix" an undefined env var by renaming it NEXT_PUBLIC_OPENAI_KEY.

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  • Thumbnail for “Fix a time zone hydration error with one React line”

    My server rendered 09:15, a viewer in New York got 05:15, and React threw hydration error #418.

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  • Thumbnail for “Claude Code path rules now load for new files”

    Same rule file, same prompt, two Claude Code versions.

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  • Thumbnail for “Next.js view transitions: thumbnail to full page in 6 lines”

    Wrap the gallery thumbnail and the detail image in React 19.3's ViewTransition with the same name, and the photo morphs between pages.

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  • Thumbnail for “Your Next.js links load pages before you click”

    Links with prefetch on download their page as soon as they show up on screen.

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