First of all, Ruby on Rail is my skill because i have been developing using this platform and Extjs as framework as well. Thus, the speed of development is more faster then building everything from the beginning. Secondly, about the structure of coding is the main purpose of working as a team because after we divided as a part for each member in the team then migrate back as a complete project, so MVC architect have been used, Additionally, Service is an extra for MVC for personal use only. Service is use for store all the function which use on controller. thus, the code on controller look clean and more structure.