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.

Helping companies and teams go AI First on the Claude platform.

Claude Code

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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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#195

Claude Code effort per model: set it once and never touch it again

If you switch models often you have been moving two dials, the model and the reasoning level. The second one now travels with the first, and your settings.json holds a key you never wrote.

#194

Move Claude Code to a new machine: what to copy from ~/.claude and what to leave behind

Your ~/.claude weighs gigabytes and your own part fits in a megabyte. Copying it whole drags three traps along: the login, the paths and the machine identity.

#193

Conditional hooks in Claude Code: run only when it matters

Your PreToolUse hook spawns a process on every single call, match or not. The `if` field filters before that process exists, using the same permission-rule syntax your allowlist already uses.

#192

/chrome in Claude Code: let Claude work in your Chrome session

Claude Code spots the extension and offers to use your Chrome from now on: your tabs, your cookies, your open sessions. What that yes actually allows depends on a setting you configured for something else entirely.

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