In the previous blog post, Go MVC Part II - Application Configuration we have imported Viper and wrote project configuration. Let’s start with Model first and then we will move upwards and write Service, Controller, and then App code and finally the main function which will start the contact web application. Model or Domain Model contains domain objects as well as the information retrieval mechanical from the database. Let’s assume our database is nothing but a go struct for the simplicity of the application.