Juan Andrés Núñez.

Senior Frontend Engineer specializing in Agentic AI, professional educator and speaker. Where engineering meets humanism.

Juan Andrés Núñez
Focusing on
Building FrontendLeap: teaching how to build the professional Web with GenAI and learning science.
Claude Code

Claude Code: from zero to professional. Tips, tutorials and deep dive guides from an engineer who uses it 12 hours a day.

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#093

Resume sessions in Claude Code: every door back into a conversation (even across worktrees)

How many good Claude Code conversations have you written off just because you couldn't remember which folder they were in? Resume has more doors than you think, and now it searches all of them.

#092

/compact in Claude Code: the instructions that vanish without warning (and how to make them survive)

Claude Code compacts on its own as you near the limit, and sometimes a rule quietly stops applying mid-task. Not everything comes back the same from a compaction: here's what's kept and what isn't.

#091

Prompt caching in Claude Code: why your next turn is slow and expensive (and how to avoid it)

Some sessions suddenly slow to a crawl and burn through tokens, and you can't tell why. The cause is almost always the same, and it's avoidable: the prefix Claude Code caches just got broken.

#090

Security in Claude Code: make it catch its own vulnerabilities before they hit prod

An official plugin puts Claude to work reviewing its own code for vulnerabilities as it writes, and fixing them in the same session. The earliest security layer: it catches the flaw in the editor, not in the PR.

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