I have a considerable experience in computer science, math, and programming methods related to trading, and in general to Computational Finance and financial data analysis (theory, Python, C/C++, Excel, Matlab). I have a PhD degree in theoretical and computational physics and a strong background in math and numerical methods, including computational financial models. I've done a lot of similar work, please see reviews on my profile. More specifically, I have good experience in developing trading strategies and APIs. It would be my pleasure to work on your project. Please contact me to discuss it in detail. The best way to handle such a large and challenging project would be to divide it into smaller phases. We would need to discuss in length the scope, goals, and deliverables of each phase, along with costs and timelines.
It might help you to know that I own an engineering company registered in the state of Illinois. I do part of the work myself, and I have co-workers whose expertise complements mine. You could deal with me as an individual freelancer or as a business, whichever better suits your needs.
Please have a look at some Computational Finance projects I've done:
https://www.freelancer.com/projects/Technical-Writing/Code-for-simulation-Scheme-Monte/
https://www.freelancer.com/jobs/Excel-Mathematics/Convert-math-proofs-Excel-formulas/
https://www.freelancer.com/jobs/Matlab-Mathematica/Write-some-Software-Matlab-Solving/