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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#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.

#129

Free up context in Claude Code without losing what matters

Your session crosses 50% context and `/compact` summarizes all of it, including the fix you just landed. There's a way to compress only the exploratory past and keep the recent work in full detail.

#128

Concentric circles: the method for keeping up when Claude touches half the repo

A big or unfamiliar change is hard to grasp reading it in silence. A method to get to the bottom: dictate your review to Claude and narrow the circle, pass by pass.

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