Below is a completely made up and ridiculous job description. Change it.
Make this job description THE job description that, were it presented to you today, would make you apply (or at least consider application) immediately.
Don't limit yourself to any of the headings. If there are headings that you feel are missing and important to you, add them and content to describe them.
Similarly, don't feel like you have to add to every heading. If you feel that some headings are a "given" or you don't feel like adding content under any of the headings - remove them!
In this exercise, feel free to look around!!!