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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#144

Opus 5 in Claude Code: the model changed on its own, your settings didn't

Opus 5 landed today and on Max it's already your Default without you lifting a finger. But three things didn't move with it: your version, your alias, and the effort level you set weeks ago. Any one of them decides whether you're really running it.

#143

How I use Claude Code artifacts to understand what I delegate

Fable doesn't need you to spell out the how, but you can only give it the what if you understand the surface. My fix: a visual artifact I sculpt, version after version, until what remains is exactly what I understand. The artifact-design skill is the chisel.

#142

Claude's Chrome extension vs Chrome DevTools MCP: which one you actually need (I use both)

Claude for Chrome, Claude in Chrome, the extension, Chrome DevTools MCP... I kept mixing them up while using one of them daily. They're two different tools, and picking wrong means missing the half only the other one can do.

#141

Which Claude Code plan you actually need: Pro, Max, or API (after using them all)

I've been through every individual Claude Code plan. The takeaway isn't "buy the biggest one": it's that if you use the tool well, Max is plenty. My criteria, not a price table.

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