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Vibe Coding vs. Agentic Engineering: The Difference Your Business Should Care About

6 July 2026 · 5 min read

AI DevelopmentAI Strategy

Vibe coding is building software by describing what you want to an AI and shipping whatever comes out. Agentic engineering uses the same AI, but with an engineer directing it: tests, review, and accountability included. The first gets you a demo by Friday. The second gets you something you can run a business on.

Where vibe coding came from

AI researcher Andrej Karpathy coined the term in February 2025 for a style of building where you type prompts, skim the result, and never really read the code. Nine months later Collins Dictionary named it Word of the Year [1]. It is real and it is useful. We vibe-code internal prototypes in an afternoon, and so should you.

The catch

Software nobody read is software nobody understands. Veteran developer Simon Willison calls vibe coding "the fast, loose and irresponsible way of building software with AI", and contrasts it with professionals who use the same tools while staying accountable for what goes into production [2]. The failure modes are predictable: security holes, edge cases nobody tested, and a codebase that collapses the first time someone asks for a change.

Vibe coding Agentic engineering
Who reads the code Nobody The engineer, plus automated tests
Speed Demo in hours Production in weeks
Good for Prototypes, internal tools Customers, money, and data
When it breaks Customers tell you Tests catch it first

The three questions, expanded

When you are buying software, three questions expose which grade you are getting, and they need no technical background to ask.

Who reads the code? The answer should be a named human who can explain any part of the system and is accountable for it. "The AI checks itself" is not an answer. AI-generated code can review AI-generated code the way a student can mark their own exam.

What tests exist? Ask to see them run. A production system carries automated checks that exercise the important paths, the payment that must not double-charge, the form that must not lose an enquiry, and those checks run every time the code changes. If the honest answer is "we click around and see", you are buying a prototype, whatever the invoice says.

What happens at 9pm on a Saturday? Software fails on weekends because that is when nobody is watching. The grown-up answer involves monitoring that notices before customers do, an alert that reaches a human, and a named person who picks it up. Vague reassurance here tells you that you are the monitoring system, and you will find out about failures the same way your customers do: by hitting them.

When we vibe-code on purpose

Plenty, and happily. When a client is unsure what they want, a vibe-coded prototype settles in an afternoon what a requirements document argues about for weeks, because people react to something real. Internal tools get the same treatment: a dashboard only our own team sees does not need the full ceremony, and if it breaks, the cost is a shrug and a fix after lunch.

The rule that keeps this safe is about blast radius, not effort. Nothing vibe-coded touches customer data, payments, or anything a customer relies on. The prototype's job is to be learned from, and then to be honourably thrown away. Throwing it away is the discipline owners find hardest, because the demo looks finished. It looks finished the way a film set looks like a house.

What production-grade actually adds

The demo took hours, so why does production take weeks? Because the demo only handles the happy path. Production work is mostly the unhappy ones: the customer who submits the form twice, the payment gateway that times out mid-transaction, the API that goes down at the worst moment. Each needs the software to fail politely, tell someone, and recover without losing data.

Add the safety net around the code: automated tests, monitoring, backups that have actually been restored once, and documentation that lets a future developer make changes without archaeology. None of this demos well, which is exactly why it gets skipped when nobody is asking for it.

What this means when you buy software

The AI has made the code cheap. What you are paying for now is the engineering around it: the tests, the review, the person who answers when something breaks. If the software touches customer data or money, make sure that person exists.

Price is your early warning. When one quote is a fraction of the others for "the same" system, the missing money is usually the missing engineering: the tests, the failure handling, the person on call. Sometimes that trade is exactly right, and a good agency will offer it openly, prototype pricing for prototype guarantees. What should worry you is the quote that promises production-grade software on a vibe-coded budget, because one of those two words is not true.

Our own workflow uses both. We vibe-code the prototype so you can react to something real, then engineer the version that goes live, the same way our AI agents earn permissions gradually.

Thinking about custom software or automation? Talk to us and we will tell you which grade your project actually needs.

Sources

  1. CNN (2025). 'Vibe coding' named Collins Dictionary's Word of the Year. cnn.com
  2. Simon Willison (2025). Vibe engineering. simonwillison.net

FAQ

Is vibe coding bad?

No. It is excellent for prototypes, internal tools, and testing an idea before spending real money. It becomes a problem when vibe-coded software handles customer data, payments, or anything that must not fail quietly.

What is agentic engineering?

Professional software development where AI agents do much of the code writing, but a human engineer directs the work: architecture, tests, code review, and accountability for what ships. Same AI, opposite level of discipline.

How do I know which one an agency is selling me?

Ask three questions: who reads the code, what tests exist, and what happens when it breaks at 9pm on a Saturday. An honest agency will also tell you which parts are AI-generated and what guardrails sit around them.

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