As time progresses, the codebase of SnowCMS, of course, increases. However, as of right now, SnowCMS is primarily worked on by one person. Sure, things get done, and without communication issues, but that is simply because there is little communication happening! 
Right now I am looking for others to become actively involved with SnowCMS, such as people who are interested in themes (we need people to tell the developers how to allow the maximum amount of customization for theme creators, along with making themes easier to create), plugins (for this, we need people who are interested in creating plugins for SnowCMS, that way they can tell us if the system needs more extensibility, such as more hooks and filters, and where), but also development of SnowCMS itself. Though if you want to be a developer at the core level of SnowCMS, you will need to start out at the lower ranks and rise up, as we need to be able to tell whether or not you are fit to have such access.
So if you are interested in any way, go to the SnowCMS Dev Forum, register an account, and introduce yourself!
Hope to see you there!