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.

Helping companies and teams go AI First on the Claude platform.

Claude Code

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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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#171

Claude Code auto update failed: the one line in claude doctor that says why (and why reinstalling won't fix it)

You see "auto update failed", you reinstall blind, and it comes back. The report already knows which of the four causes it was. Nobody told you which line to read.

#170

Expand pasted text in Claude Code: get back the 200 lines it just swallowed

You paste two hundred lines of log, Claude Code turns them into [Pasted text #1 +200 lines], and now you cannot read or fix what you are about to send.

#169

Claude Code task list: your model writes it but no longer saves it

You ask for the list, Claude writes one out, and it all looks normal. But Ctrl+T is empty and nothing survives /compact: since 2.1.233 the newest models ship without the tools that fill it.

#168

Claude Code notifications on your phone: it wasn't frozen, it was waiting on you

You kick off a long task, walk away for twenty minutes, and come back to zero progress. It did not crash: it spent eighteen of those minutes waiting for you to approve one permission, and you were not there to see it.

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