Watch a junior developer work with GitHub Copilot and watch a senior developer work with GitHub Copilot. The prompts are not that different. Both describe what they want. Both iterate when the output is not right. Both spend time reviewing and correcting. But the output is different. Not because one is smarter. Not because one writes better prompts. Because one of them has defined what the output must look like before the session begins. What experience actually teaches you about AI Junior developers trust the output. They prompt, review quickly, and move on. The code works. That feels like enough. The inconsistencies are not obvious yet. The technical debt is not visible yet. The cost of no standard has not shown up yet. Senior developers have seen the cost. They have inherited codebases where every developer used AI differently. They have done the refactors. They have written the pull request comments about consistency for the hundredth time.…