Software engineering is definitely a thing. There are numerous ways to code robustly and to prove the software will do what it's supposed to. They're much used in mission-critical applications where failure is a Very Bad Thing.

But most developers do none of these things, and many developers don't even know they exist.

But prompt engineering is just search++. You might save some time if you know a little about the underlying technology, and there's an element of creativity which is unusual for search.

But it's still not rocket surgery.