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

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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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#153

Claude Code browser: which of the three to use, and why the Desktop one is not your Chrome

Claude Code has three ways to hand Claude a browser and most people don't know which one they are asking for. The Desktop one starts on a clean profile with none of your logins, and that is the whole decision.

#152

Vim mode in Claude Code: how to stop reaching for the Escape key

Claude Code has a full vim mode inside the prompt, motions and text objects included. And for a few versions now you can stop reaching for Escape on every sentence, though the fine print has four rules you would never guess.

#151

--dangerously-skip-permissions in Claude Code: why your script exits green without doing anything

Your CI job calls `claude -p`, exits 0, and the commit isn't there. Nothing warned you, which is why half the internet ends up pasting `--dangerously-skip-permissions` into the pipeline.

#150

New line in Claude Code: why Shift+Enter submits your prompt, and the key that always works

You press Shift+Enter for a new line and Claude Code submits half your prompt. It is not your fault and it is not a bug, and one key never fails.

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