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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#206

Opus 5.5 in Claude Code: Fable-level, faster, and cheaper than Opus 5

Opus 5.5 lands in Claude Code performing like Fable 5.1, generating over 30% faster than Opus 5 and costing 40% less. It's already your default model, but two details decide whether you're getting all of it.

#205

Claude Code plugin update: how to make your plugins update themselves

Your official plugins update themselves. Yours and third-party ones don't, and the update command reports you're current while serving a stale cache.

#204

Plugin evals in Claude Code: find out if your plugin really does what you think

Your plugin fires, Claude answers well, and you assume the plugin is why. The command that just shipped runs the same case without it and shows you the gap.

#203

Prompt hooks in Claude Code: when the rule needs judgment, not an exit code

Some rules a script cannot check, because they are not a condition, they are a judgment call. A prompt hook puts a fast model in charge of that decision, on the event you pick.

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