Engineers: study how to build. This may include original theorizing pertaining to methods of building -- they don't just ape scientists' theories, they create their own. Engineering is itself the science of building.
Developers: Engineer vs. developer is an arbitrary division. In truth there is a continuum from the most scientific of engineers, who use abstract theorizing to create new technologies, down to someone comparable to the person who installs your water heater.
Engineers: study how to build. This may include original theorizing pertaining to methods of building -- they don't just ape scientists' theories, they create their own. Engineering is itself the science of building.
Developers: Engineer vs. developer is an arbitrary division. In truth there is a continuum from the most scientific of engineers, who use abstract theorizing to create new technologies, down to someone comparable to the person who installs your water heater.