Bug

Bugs are an inherent part of software development. They range from trivial cosmetic issues like a misaligned button to critical failures like data loss or security breaches. Every application has bugs; the question is whether they are found before or after users encounter them.

In vibecoded applications, bugs take on a unique character. Because the AI generates code based on patterns from its training data, it can produce code that works in most cases but fails in subtle, non-obvious ways. Common patterns include race conditions in asynchronous operations, incorrect handling of null or undefined values, and form validations that check on the frontend but not the backend.

Finding and fixing bugs before they reach users is the fundamental purpose of quality assurance. Every bug caught during testing is a negative experience prevented for a user. For vibecoded applications where the builder may not be able to predict where bugs will appear, professional testing by humans who know what to look for is an invaluable safety net.