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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#146

Dependent tasks in Claude Code: catch the flaw in your plan before it runs

Claude Code tasks can block each other. That turns the list into a graph, and a graph can be audited: it shows you how it understood the work before it writes a single line.

#145

Opus 5 in Claude Code: 8 tips from Anthropic on what to do differently

Anthropic published a model-specific prompting guide for Opus 5 on launch day, and almost nobody read it. Half of what it recommends is removing instructions from your CLAUDE.md, not adding them.

#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.

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