In your opinion what's the difference between the two? In my opinion both terms are frequently used interchangeably in the workplace.
But I'd like to consider myself as an engineer, because although I don't consider myself to be good at it, I think I cares about the software that I worked on, its interaction with other services, the big picture, and different kinds of small optimizations.
I mean, what is even engineering?
If someone flies the "software engineer" banner seriously, I expect them to have some theoretic knowledge besides the practical one. They would know different programming paradigms (procedural, OOP, FP), know about programming patterns, layers, UML, and at least a programming language or 4 (3 superficial, 1 in-depth).
A software developer can be any random code-monkey picked up from the street that is self-taught and/or had a boot camp of sorts. Nothing wrong with being self-taught or boot camps, as SDs need to eat, but it lacks a certain level or rigor I would expect from a SE.
If both had a certain amount of experience the SD would mostly catch up to the SE, in practice. Not sure if on theoretic knowledge too, but that depends.
I have been a network engineer with no degree for many years, but I did have a lot of certs. It'd be nice if there were something similar for programming. But I've never seen anyone care that much about the engineer title. I've always thought it's someone who understands his craft/engine design in and out, but doesn't design it himself. The architect designs it. The tech can perform documented solutions