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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#115

Your own security rules in Claude Code: catch hardcoded secrets on every edit, for free

Claude Code's security plugin ships generic checks. The part almost nobody configures is the free layer: a file of your own patterns that catches your secrets and leaks on every edit, without spending a token.

#114

Stop babysitting your PRs: let Claude Code fix the failing CI for you

You push the PR and sit there refreshing GitHub to see if CI passes. There's a terminal command that moves that loop to the cloud: it watches the PR and pushes the fix on its own when CI fails or a review comment lands.

#113

Prompts in Claude Code: the 5 rules Anthropic actually follows

Five concrete rules straight from Anthropic's official docs that any Claude Code prompt should follow. Not from a prompt-engineering course, from the docs themselves. Same rules whether you're vibe coding or shipping production.

#112

How to stop or redirect Claude Code mid-task without losing its work

Claude's about to edit the wrong file and your instinct is to hit Esc. Sometimes that's the wrong move: stopping cold and steering on the fly are two different keys, and which one you pick decides whether you lose the work in progress.

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