The description is quite broad so I can't picture clearly what are the app's parameters e.g. what operating system, what type of data scrapping is required, how bets are authenticated and placed... If these are clarified and it looks worth investing time and as lucrative as you wrote then I can put quite a bit of effort into it.
Kind regards,
x3x7
p.s. Please ignore the "milestone" as well as the price quotation. Far too early for these but the bidding tool requires them.