plastic mold factory wordpress website

I would like to have different proposals (whether they are with links or mokup) to choose and start immediately

The changes must also be compatible with subsequent WordPress updates, and reports are required to upload changes to the live site.
The bid must be real to identify the freelancer.
The project work will be developed in a dev-area in our hosting. All the customization need to be stable for future WordPress update.

-create development area in my vps
-improve safety and speed and responsive
-after future updates everything must continue to work
-report of how all the jobs were performed

It is not possible to install any plugins before asking for authorization