Greetings,
I'm a software architect, with a master degree in complexe software engeneering.
UML diagram are in the center of my abilities.
I work on argoUML, starUML or lucidChart, i'll provide clean and clear diagram (use case) with all the constraints and comments needed to avoid missunderstanding.
I also provide as many revisions as you want.
Feel free to contact me and have a nice day.