Yes, I am a mechaical engineer, for the Corps of Engineers.
However, I'm in Operations. Rather than coming up with good, new designs, I'm more often tasked with fixing problems that users have encountered with not-so-good designs.
The alternatives I come up with aren't always the least expensive. Nor always the easiest to build. However, I do try to suggest things that are easiest to use once they're built. That's been my job for much of my career, and my collossal ego demands that I admit to being fairly good at it.
I don't always succeed, but it's not for lack of trying.
Engineering: Finding complex solutions to simple problems you didn't even know you had.