With an extensive experience in web based applications and PHP/Javascript, we are confident we can deliver your project in 10 days (but you'll have to explain what the simulation is actually testing, as it is not obvious :)
We are a development company based in Budapest, Hungary with more than 10 years experience, working mostly for Hungarian and US customers. As to to your project, we will assign a full-time developer for the project with the following approach:
1. We prepare a short statement of work (SoW) for the tasks you have outlined. For that, we will need to clarify what you actually would like to achieve. We can do it either before or after the bid is accepted (we would actually prefer before) in frame of a Skype call.
2. On the basis of the SoW reviewed by you, we will write and test the code, either in our own development environment or yours, to be defined in SoW.
3. We will hand over the program that you will be able to test on your own. Acceptance test criteria should not include anything beyond the SoW (we can be flexible of course for cosmetic modification, but this is the basic principle). We are suggesting another Skype call with the developer at this point.
4. The software will be documented according to industry standards and we will gladly adapt to your requirements regarding Git/SVN and other coding practices you may have.
5. We warrant for the quality and copyright status of our work.
We would be glad being able to work with you,
Best regards, Tamas