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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#133

Claude Code doesn't just write your code, it explains it

When you land in a repo you didn't write, Claude Code can explain every pattern and decision as it works, instead of just leaving the code done. Even Claude Code's creator recommends it, and you can pin it to the project.

#132

Claude Code /doctor no longer just diagnoses: now it fixes what it finds

`/doctor` used to be the report you ran once something already failed. Now it's a full checkup: it finds what's broken and, above all, the dead weight quietly eating your context, and offers to fix it with your OK.

#131

Your plan B for Claude Code's 529 errors

When your model returns a 529 (Overloaded) mid-task, the request doesn't have to die. Configure a chain of backup models and Claude Code degrades on its own instead of leaving you stuck.

#130

Stop waiting on Claude Code: line up your next moves while it works

While Claude works you don't have to sit and wait, or cut it off to give the next instruction. There's a queue, and you control it with the up arrow.

Gravitas

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