This is why I have always enjoyed working for smaller companies. I've got to do lots of things, I'm a multi stack developer (tm), I code for embedded systems, Web, and Desktop. You build from scratch the things you need, you make "executive" decisions about technology stacks and generally do kind of hobby like stuff but in a proffesional way. You work with a few other individuals in the same boat and constantly have to innovate.

There are downsides, you rarely get to focus on one thing for any extended amount of time, so some of the bigger pieces of work get trickier to do. Often you come up with really good ideas that would be great to do but just go on the back burner.