Why AI makes building easy but systems hard — and what separates a working demo from a system that holds up in the real world.
AI lowers the barrier to writing code dramatically. What used to take a senior engineer days now takes minutes. But the systems that code runs inside have not changed. The same rules about reliability, security, state, and failure apply regardless of who or what wrote the code.
A system is not just the code you wrote. It is the code, the infrastructure it runs on, the data it reads and writes, the users interacting with it simultaneously, and the external services it depends on. When one part changes, everything connected to it is affected.