Technically, I don't know that I am. I may be, though. You want a serious bidder, that's what I am. Know that as a serious bidder, I have questions as well. You have an idea and main characters: What is it and who are they? I can write in many voices, but there are certain genres I'm not comfortable writing, no matter how much money you offer. If you me to ghost write a story where the hero is a pedophile...I suggest you seek elsewhere. If you're story involves a deep knowledge of, say, basketball, that's fine, but you may want someone who already knows a lot about it.
What I can do is write dialogue very well, in many different voices. I can develop characters and follow the arc of a story with notes or suggestions that you lay out. I will have questions, and I will quickly answer yours.
I don't have any of my creative short fiction posted here (as of 4:30pm EST March, 14th) but I will before 6pm EST (same day).
Give it a look and see if you like it.
Good luck finding the voice you're looking for!