Domain Expertise, Not Code, Is the True Competitive Advantage in Software
By
aaronbrethorst
Crusty in the right places. Worth the chew.
Summary
The article argues that true competitive advantage ("moat") in software has always been domain expertise—deep understanding of the business problem—not the ability to write code. The author contends that while AI tools (like LLMs) can now generate code, they cannot replace the hard-won domain knowledge required to build correct, useful systems. The piece warns that relying on AI without domain understanding leads to plausible but wrong outputs, and that the real value lies in expertise that AI cannot easily replicate.
Key quotes
· 4 pulledThe hard part of writing software has never been the writing. It was building a working model of the domain in your head first.
Before you could ship a payroll system you had to understand garnishments and pre-tax deductions and what happens when someone's pay period straddles a rate change.
The code was a transcription of that understanding. Acquiring the understanding was the job.
Agentic AI severed the link between the...
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