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Vibe Coding

Explore practical Vibe Coding articles grounded in clear explanations and engineering tradeoffs.

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Vibe Coding

AI Coding & Agents5 min read

[Vibe Coder #7] Avoiding AI, DB, and hosting bill shocks

"I woke up to a cloud bill of several million won." Posts like this appear regularly in vibe-coding communities, and they are enough to make anyone's stomach drop. A hobby app has returned a month's salary as an invoice. The scary part is that this is not an accident limited to unusually careless people. If you do not understand the billing model, it can happen to anyone. Billing…

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AI Coding & Agents5 min read

[AI User Guide #8] The AI Agent Era: A Complete Overview

The AI covered in the previous seven installments was ultimately a “ask-and-answer” tool. People drove the conversation: refining questions, providing materials, and verifying answers. But the next step the AI industry has pursued for the past two years is different in kind. AI agents do not just converse—they take on the work itself.…

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AI Coding & Agents4 min read

[Vibe Coder #6] It worked yesterday, not today—why, when I didn’t touch the code?

“I didn’t touch a single line of code, but the app that worked fine yesterday doesn’t work today.” It’s the most common complaint in vibe-coding communities—and one of the most mysterious situations. It feels like a ghost story, but the suspects are actually limited. Investigate them in order, and you can usually catch the culprit before noon…

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AI Coding & Agents6 min read

[Vibe Coder #2] What is an API, and why must API keys be hidden?

In Part 1, I compared an app to a restaurant: dining area (frontend), kitchen (backend), and storage (DB). This time, we cover the topic most likely to cause trouble in vibe coding: APIs—and API keys. Everyone has seen “Never expose your key,” but few explain what the key is, where it lives, or what happens when it leaks. This article covers it all.

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