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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#106

/cd in Claude Code: jump to another repo mid-session without losing your context

Switching repos mid-session meant quitting and relaunching, losing your context. /cd moves the session to another folder without restarting, and without rebuilding the prompt cache.

#105

/code-review locally: review your diff before the PR (it's not just the GitHub bot)

Most people think Code Review in Claude Code is the Team/Enterprise GitHub bot. There's also a /code-review that runs in your terminal and reviews your diff before you open the PR, with nothing to install.

#104

AGENTS.md: the standard Cursor, Codex and Copilot read, but Claude Code doesn't

AGENTS.md is the standard Cursor, Codex, Copilot and half a dozen others read. Claude Code is the exception: it reads CLAUDE.md, not AGENTS.md. The good news is you join them in one line and keep a single file.

#103

Claude Code in VS Code: the panel Anthropic recommends and almost nobody uses

Most people run `claude` in the integrated terminal and think that's using Claude Code in VS Code. There's a native panel, the one Anthropic recommends, that reviews plans, shows inline diffs, and lets you @-mention line ranges. Plus what still sends you back to the terminal.

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