Systems diagrams for powerpoint and online -- 2

Over the coming months we will need to create several high-level (logical) systems diagrams for use in presentations and online. So we will need a designer who can take photos of scribblings and turn them into professional diagrams, involving a few iterations e.g. see attached. Please note freelancer hired will need to sign an NDA and IP Transfer agreement between him/herself and our company before starting the work.