I highly recommend looking into self-organized teams, iterative development, and kanban. Story point mapping can be a great tool for iterative development (so that in your first week, you have a full version of the app, but just a skeleton, and you build on it from there). Most of my development has been in a team of five or fewer developers, and I find this really works well. This is a good resource: http://www.personalkanban.com/pk/[^]