Programmer for a multiple choice story app (ios+android)

Hey my friends,
I am looking for someone to program an app (ios+android cross) with the following specifications:

- a store in which you can purchase stories (in-app-purchase)
- a collection where you can see and choose a story which you want to read.

The stories are formatted so that, after a couple of pages of reading, the protagonist faces two or three options, each of which leads to more options, and then to one of many endings.

So first there is a text and after you read it you can go further by clicking on one of the options and then the next text appears and so Upgrade to see actual info is important that it is easy to add new stories. So there has to be an intuitive way to build the story paths with a decision tree and insert parameter like text, next options, background picture, background music and those things. I will give a more detailed requirement list then.

Please apply with your portfolios and a rough price conception, what you think it will cost.

I hope to hear from you soon!

Regards,
J W