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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#211

Claude Code scheduled tasks: 3 common failures and how to fix them

A local Claude Code task only runs while the app is open and the machine is awake. Otherwise it gets skipped, shows up hours late, or waits on a permission nobody is there to approve.

#210

Claude Code subagents: the limit Anthropic removed, and how to set it yourself

Claude Code added a cap of 200 subagents per session to stop runaway delegation loops. Twelve versions later it was gone. Here's how to get the brake back, with a tested hook and one frontmatter field.

#209

/claude-api prompt-audit: your CLAUDE.md and skills, optimized for Opus 5.5

All-caps rules, "think step by step" and contradictory instructions were written for older models. `/claude-api prompt-audit` finds each one by file and line, and changes nothing until you say so.

#208

Claude Code ultrathink: what it does now, and what it doesn't

Half the internet says it's dead, the other half thinks it maxes Claude out. I measured it across 45 runs: it's neither.

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