I was hired to create an ERP system for a company. The system would be Web, hosted in the cloud, developed with PHP, MYSQL and JavaScript. In addition to all the registration screens, data visualization, CRUD, reports, search ... It would have to have communication with normal printer and non-fiscal printer.
It's a lot of data and information, it would have 3 levels of access (admin master, manager, employee).
My question: Is it safe? Is it advisable to do? Taking into consideration that the connection is good. What kind of server do I need to hire? What worries me the most is printing files and security.