Vibe Coding: What Is It?
A Full Breakdown + How 5 Types of People Should Use It

Vibe coding is the term Andrej Karpathy coined in 2025, and within six months it had swept the developer world. This is the no-fluff breakdown — what it actually is, why it caught on, its upsides, its fatal flaws, and how 5 different types of people should use it. Used right it's a tool; used wrong it's rubble.

※ The term "vibe coding" was coined by Andrej Karpathy in 2025. This piece is a roundup of concepts and practical advice, not an authoritative official definition.

What it isn't

Let's clear up a few misconceptions first:

• It isn't "using AI to write code" — that's the broad idea, and it's been around for ages
• It isn't "a Cursor feature" — Cursor is just a tool; vibe coding is a way of working
• It isn't "you get a product without writing code" — it's a coding posture, not a miracle

What it actually is

Vibe coding is a coding posture:

"Turn the act of writing code into a conversation with an AI.
You describe the intent, the AI writes the code, you run it, and if it's off you describe it again.
You never read the code at all — you just feel out the result."

The key phrase is — "you never read the code."

That's the biggest difference from the old "AI-assisted coding" — before, you'd review the code the AI gave you and only use it once you understood it. With vibe coding you skip the review entirely and only check "does it run the way I wanted?"

This posture has its use cases — and its fatal blind spots.

Why it caught on

Because for the first time, it let people who can't code actually build something with code.

The old world:

• Have an idea → learn to code for 6–12 months → start building → ship
• High failure rate; fewer than 5% make it through the self-teaching grind

The vibe-coding world:

• Have an idea → open Cursor → describe it in plain language → have a prototype two hours later
• No coding skills required

This is a genuine revolution. For the first time we're seeing that "able to type + able to describe what you want" is enough to build something.

Upsides vs. fatal flaws

See the pattern?

Vibe coding is a superpower in the "0 to 1" stage.
Vibe coding is a disaster in the "1 to 100" stage.

Vibe coding gives you speed.
Engineering discipline gives you maintainability.
The two don't conflict — but you have to know when to switch.

5 types of people — how you should use it

When to stop vibing and start serious engineering

This is the most critical call to make. Here are 5 signals:

1. Someone starts paying for it — no matter how little; the moment the first dollar lands, switch your posture
2. You pass 10 users — bugs start hurting other people
3. You start being afraid to touch the code — changing one prompt breaks 3 places
4. It connects to external systems — a DB / API / payment mechanism; the stakes go up
5. You need someone new to take it over — even if it's just a friend helping out

The moment any 1 of these 5 signals shows up — treat the vibe-coded output as a prototype and clean it up from scratch:

• Read every section
• Ask the AI to explain anything you don't understand
• Add tests (at least 1)
• Add a README
• Commit properly with git

This "cleanup" usually reveals that 30–50% of the code needs rewriting. That's not failure — that's the correct engineering process.

3 practical rules of thumb

01 Show the AI the difference between "prototype → product"

Add this at the top of your .cursorrules or your prompt:

# Current phase
This project is in PROTOTYPE phase ─
optimize for speed, OK to skip tests/types/error handling.

When we move to PRODUCTION:
- I will explicitly say "let's harden this for production"
- Then add tests, types, proper error handling, logging

This way the AI knows which phase you're in, and the code style it gives you will match.

02 Use a git tag to mark "vibe ends / engineering begins"

When you decide to switch posture:

git tag -a "v0.1-vibe-end" -m "End of vibe phase, beginning serious engineering"
git push --tags

This tag is your marker for "which parts were the sloppy ones" when you look back 6 months from now.

03 Do the non-vibe things separately

Things vibe coding is a bad fit for:

• Login / authentication
• Payments
• Handling personal data
• APIs exposed to the outside world

These features — don't vibe them. Even if the whole project is in its vibe phase, build these few modules the "read the code + tests + review" way.

A project doesn't need to be all vibe or all serious. Mixing the two is the sweet spot.

One last idea

Vibe coding isn't about "replacing engineers" — it's about "lowering the cost of trial and error."
It lets more people try, more ideas get validated, and more ideas with real sense rise to the surface.
What's truly scarce has never been "knowing how to write code" — it's "knowing what to build."

The biggest opportunity of this era isn't vibe-coding a SaaS and then raking in six figures a month (that's marketing spin) — it's using vibe coding to get your idea down to something you can validate in a week, then finding 5 real users and turning their feedback into "something worth engineering for real."

Vibe coding is your ticket in, not your destination.

Further reading — Engineers in the AI Era series

• Vibe Code Rescue: The Complete SOP
• AI Gives You Code, Not Software — A 14-Point Checklist
• 12 Cursor Tips — From Knowing It to Being Good at It
• Will AI Replace Engineers? An Honest 2026 Answer
• The Complete Guide for Engineers in the AI Era (Pillar)