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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#083

LSP in Claude Code: the code navigation you don't know is switched off

Claude Code ships a built-in LSP tool — goToDefinition, findReferences, type diagnostics — but it comes switched off. And the #1 mistake turning it on is thinking the plugin does something it doesn't.

#082

.worktreeinclude in Claude Code: the file that keeps your .env from vanishing

You create a worktree, your app won't start, and Claude burns tokens debugging a non-bug. .worktreeinclude fixes it in one line — and you probably don't know it exists.

#081

/run and /verify in Claude Code: verify by running your app, not just passing tests

Claude Code v2.1.145 ships three skills that change how Claude says "done": it launches your app, drives it like a user, and observes whether the change works at runtime — not in the tests.

#080

Creating Claude Code skills: the 5 rules Anthropic publishes (with real examples)

Most skills sit unused. Anthropic publishes five concrete rules so yours actually gets invoked — and an official skill that applies them for you.

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