Planning of a management system, based on MySQL

the job is to plan a management system for a small, local salon. This system is to be accessed and used by staff members only (excepting admins, developers and similar). It is meant to support their work. To achieve this, a cooperative process of development is requested. The process would be (and it is successfully tested and running regarding the public section): - you receive the docs regarding a certain step of the development - you get back with your clarifications - you work out this step (this ToDo) - may be come back for final clarifications - I am reviewing, once this is done with and we go on to the next step / ToDo, and so on... Could you imagine to be a partner for this kind of working? Attached please find two documents for your imagination. one is a screenshot of a mockup in the particular management section of WP, the other one is a snapshot of a view of a doc of tables, being in development. The development would take place parallely to the workings of another developer, since the time is running and running away ... Thanks for your proposals, regards, Ulrich Edit 2019-04-13 It may not easily be understandable, all the work is to be done directly on our server by using the power of Elementor pro wherever applicable. FTP is available for exceptional cases only. Edit 2019-04-13_2 ok, please excuse, the CMS is Wordpress