Economist Jason Furman vibecoded a prototype in one night, now sits on 500k lines of code
soumitrashukla9 · x · 2026-10-24
Economist Jason Furman shares his vibecoding journey: he 'vibecoded' the original of his interest-rate tool in a single night this spring, and after months of iteration the codebase has grown past 500,000 lines — none of which he has looked at.
He compares himself to the person who 'didn't do it because it was easy but because I thought it would be easy': AI coding makes prototyping trivially fast, but the last mile of turning a prototype into a reliable product is brutally hard. A vivid anecdote about the prototype-to-product gap in the AI coding era.
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