In my experience, I have only developed internal enterprise software for my entire career. Most of this stuff is gloried CRUD. Above all: Ship early and ship often. You don't get paid more for having less bugs. (Of course, don't ship crap, but you don't need perfection.) Also, often the specs (in my line of business) are unwritten, so you learn more by releasing quickly, then watching (internal) customers use the product and provide feedback.