The 80/20 Rule of AI Code — Why the Last 20% Takes 80% of Your Time (opens in new tab)

AI wrote the first 80% of my feature in 10 minutes. The code was clean. The logic made sense. The happy path worked on the first try. I ran it, saw it work, and felt that specific kind of developer pride that makes you lean back in your chair slightly. I was impressed. I felt genuinely productive. I thought I'd be done in another 10, maybe 15 minutes. That was Tuesday By Thursday evening I was still working on the same feature. Not because the AI had failed. Because it had succeeded at exactl...