variant a: Developers often have side projects that they work on in their spare time, in addition to their regular job. These projects can be things like building a Raspberry Pi robot, creating a to-do list app, or making an iOS game that makes a few dollars. variant b: Side projects are usually hobby programming projects that a developer builds alongside their job, like a Raspberry Pi robot, a to-do list app, or an iOS game that makes a few dollars.