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.

Explore the hub
Claude Code Tips View all →
#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.

#111

MCP "Failed to connect" in Claude Code: the decision tree that ends the panic

When an MCP server goes red with "Failed to connect", it's almost never your config. A decision tree to tell in thirty seconds whether it's auth, a wrong URL, or a local process that died.

#110

/team-onboarding in Claude Code: your setup turned into a guide (even with no team)

You see it, think "that's for teams", and scroll past. Mistake: /team-onboarding scans your last 30 days and writes a guide to your own setup. For a new teammate, or for your future self on another machine.

Gravitas

Get only what matters

If I have nothing worth saying, you won't hear from me. When I do, you'll be the first to know. 7,000+ people already trust this.

Are you a professional Web developer?
No

Unsubscribe at any time.