Visio diagrams for cobol programs

I am in need of a freelancer who can create Visio diagrams for my existing cobol programs. There are more than 7 programs that need to be diagrammed, and I am looking for a high-level overview of each. The diagrams should include a clear representation of the program's flow, but it doesn't need to be overly detailed. I will be providing detailed instructions for the freelancer to follow. Ideal candidates for this job should have experience in Visio diagramming and be familiar with cobol programs.