Rapid development leaded from simple submission system, through payments to abstract generator.
The project started with pretty simple registration model. Submit attendance to a conference, pay, and take a participation. That was the beginning of the project. Than we added submission of scientific abstracts with co authors - each cooperators got an e-mail and had to register in. After that we faced the rapid preparation for conference. Quickly we have added PDF generator for IDs, certificates and abstracts. Our system works very flexibly with new features.