As a general rule, the larger a codebase, the more issues the development team will encounter. Here, general tips and standards apply, from the proper use of comments and white space, to good organization of code structure.

That being said, no matter how good the formatting and style, large projects require good source code repositories and systems for communication between developers. There are endless numbers of development methodologies that can be used, but one thing nearly all of them have in common is that communication between developers and external stakeholders is more and more important as the codebase grows larger.