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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#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.

#079

Background agents in Claude Code: the map of four ways to stop watching the terminal

There are four ways to let go of Claude Code and come back. Each one is for a different thing — pick the wrong one and you lose half the value.

#078

Claude Code Router: the trick to cheaper Claude Code (with the trade-off nobody mentions)

"Claude Code free" has been the top search for months. The community's answer isn't magic — it's a local proxy that decouples the CLI from the model. And there's a trade-off most blogs leave out.

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