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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#095

CLAUDE.md, settings.json, or .mcp.json: which Claude Code file does this go in?

CLAUDE.md, settings.json, settings.local.json, .mcp.json: it's easy to get lost. The key to never putting config in the wrong place: CLAUDE.md is read as guidance, settings.json is enforced. Two questions pick the right file.

#094

Claude Code slow, hanging, or eating your RAM: the fix list you didn't know existed

Before you blame the model or search your symptom on Reddit: when Claude Code drags, hangs, or eats your RAM, almost every problem has a one-line fix the docs keep buried.

#093

Resume sessions in Claude Code: every door back into a conversation (even across worktrees)

How many good Claude Code conversations have you written off just because you couldn't remember which folder they were in? Resume has more doors than you think, and now it searches all of them.

#092

/compact in Claude Code: the instructions that vanish without warning (and how to make them survive)

Claude Code compacts on its own as you near the limit, and sometimes a rule quietly stops applying mid-task. Not everything comes back the same from a compaction: here's what's kept and what isn't.

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