Remote Administration Tool

Hello, I work in computer security I am looking for a server / client that is basicly a remote administration tool that should be able to work even with all modern antivirus softwares working and intact, including windows defender. You need to be able to hide this process / software properly to remain undetected, id like to grab the screen image of the server that i run on my own machines and be able to execute files bypassing UAC or gaining those rights. Please, only very sophisticated coders apply as I will have a *very* high screening process and a very high requirement for completition of work.