Web Application

I would like something cloud based front end backend c# aspnet. Or desktop software with sql base for windows and mac. It is not really complicated and i do have some knowledge in c# so i will be able to update it if needed. I need a good base ready to work. So basically that's what i want : I want an authentication system with 2 roles Administrator and User. I also want it to be different for every group I do. Each group has its user base and its customer base to which users have access. Once a group user logs in, he has only access to his group's Customer Base. Basically, on the customer base there is name, first name, address, phone, equipment, ... The customer base must be customizable by the administrator who can add/delete a category (Last name, first name, address, etc.). The user can Read / Write in the customer base but cannot modify the categories. The administrator can import a database The administrator can export the existing database as is or with selection (All the equipment of a single customer for example). Reminder Interventions The admin chooses which reminders to display. View equipment that needs to be serviced based on reminders. Admin can set a deadline based on a category with a date or criteria. For example a category with "last maintenance" in the customer database, the administrator can choose a reminder every 1 year. The user can also make a reminder for one or more equipment/customer by indicating a date and the type of reminder. But not for a category. Schedule The user can change the visibility of the schedule (day, week, month, year). The user can plan an intervention / or delete an intervention. The user can choose the duration of the intervention. The user can program several interventions on the same slot (display a msgbox to indicate to him that an intervention is already planned if he wishes to continue yes/no). The user chooses whether it is one or more interventions to plan before assigning a time slot. The user can tick a checkbox if he wishes to send a confirmation email to the customer, the same if he wishes to send a confirmation sms. Sms & Mail with standard mail and autofill with customer base Admin can change mail type, sms type, fields for merging in mail/sms. "Customer database, Reminder, Schedule" are independent to each group.