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.
IMO an engineer should be able to develop a complex system which an entire company could potentially be based upon.
A developer who isn't an engineer would focus more on individual libraries, apps or tools that don't necessarily require the mindset of an engineer to design and maintain.