he built a programming language in 3 months - mostly without typing
Geoffrey wanted to build a programming language. Lexer, parser, type system, LLVM compilation - the works. That's normally a years-long team project.
He wrote a detailed spec, set up automated tests, and let Claude run in a loop - catching its exits and re-feeding the prompt with the updated codebase. Month after month, it kept building.
His contribution? About 20 hours total. Mostly architectural decisions at critical moments.
The result: a compiler that produces native binaries. Fully functional.
Read the full breakdown - including the exact loop pattern he used - here.
P.S. What's the most complex thing you've tried to delegate to AI? Hit reply - did it work or fall apart?
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