There is a bright side to this - you're also rather important to the company. You're in effect the 1 in "bus factor 1" of several key activities that nobody els

There is a bright side to this - you're also rather important to the company. You're in effect the 1 in "bus factor 1" of several key activities that nobody else wants to do and nobody else is really qualified to do. This should allow you to put your foot down more often, refuse overtime, demand recognition for contributing to prototypes and to be given more interesting work. Your managers may not care for you, but they care for the company (unless it's one of those cash burning shops, but that's an entirely different problem). After long enough, they should even come around to the idea of hiring a junior dev under your supervision and training to take care of the more lower-level tasks.