Dear Sir,
You have a very interesting project, and I would be very happy to provide it. Also you clearly have a very clear and thought about specification. However, there are some issues that will need to be addressed before we start.
1- About the price. What you want is a powerful and extensible trading platform, and also one that works with ultimate performance. The effort in implementing that will command a price of "at least" $3,000, probably more.
2- Personally, I (and many good freelancers) cannot agree to start a such large project directly, especially since you do not have a track record on the site. The reason is that upon accepting the project, we pay a 10% fee to the site. We much prefer to divide such projects into a more manageable set of subproject and implement those separately.
3- Although you provided a very clear document, such sized project will need a much more detailed design document, that the developer will prepare. This document will mention in detail each feature of the system, the project milestones in term of features, and the time line / payment schedule for each milestone. This document will serve as a kind of contract between the developer and you, and it needs to be done and agreed upon before accepting the project.
If you agree on my rationale, and are willing to spend such amount for an excellent product, then there are several options we can start this project. We can discuss those in chat.
Kind Regards
Khaled Hawas
Wadjet Software