hello, I have gone through your project details, well first of all about my capabilities for this project according to your skill set are as follows :
1. PHP Laravel FrameWork
Have been working on PHP, MVC for 3 years, on laravel for 1 year and even I have my own fully OOPS MVC platform.
2. Twitter Bootstrap
although it's the concern of a designer, still I have the knowledge of integrating any bootstrap plugins and as well as I have good UI designer on board.
3. Javascript Framework
Same as my last answer
4. HTML5 and CSS3
same as my last answer.
5. Ajax & Jquery
Now in modern days Ajax is a must one for web development, so I know that.
6. 3rd Party API such Facebook Graph API, Twitter API, Mandrill API etc.
On API, through out career, I have used so many APIs and these Facebook, Twitter and Madrill (Mailchimp) are the common to use.
7. Front End and Back End Development.
The answer on this, I think I already have covered.
Now, on the payment terms and long-term relationship, yes I would like to have the strong bonding with a source of work and I think the price I have given here is on your tight budget. We are also on start-up foundation. So, I think we can go ahead. Please contact. Thanks.