Software design 03-phase 1 -- 2

I am looking for a software developer who can design a complex software using [login to view URL] and React. The software should be developed within a specific deadline, which will be provided by the freelancer's proposal. The ideal freelancer should have experience in developing complex software and have proficiency in [login to view URL] and React. This project is complicated as a software using for control system, so some calculations and control theories must be used inside the software to send output based on the input variables: I/Os. We divided the project to many phases for simplicity purpose. However, there will be an assistance by our control engineer to provide insights for the software designer. The selected candidate, freelancer, must be available most of the time with great communication skills and disciplines to be able to work effectively with our engineers. The freelancer must be able to design drag/drop of the items from the Menu bar, connect the items together, send/recieves data interconnecting with a backend, passing data between items in front end, as well as chnaging status of some items. Full support in terms of functionality and logic will be provided. Some part of the front end and backend was successfully done. It needs further development. PS: this is a big and complex project overall. Due to its requirement of highly skilled programmer, there are mandatory tests that candidates must do it before being hired!