One of the first things that you have to consider would be the developer's experience as well as expertise when it comes to developing applications.
This factor alone is a very important one that you should carefully consider in order for you to really find the kind of Social Sharing App service providers who would be competent enough to do the job right. After all, a lot has been proven over the years regarding the quality of work that businesses in the field have for years now and this therefore is a chance to have high quality results and discounts at the same time. This is why it is encouraged that as much as possible, you have to go through their portfolios and track records so you will know what success rate they have among new clients.
Another factor that you have to consider would be the quality of their services, which should be high quality depending on their asking fee of course.
Given that your service provider of choice have already been in the business for quite some time, it wouldn't be wrong to expect a dedication of giving high quality work from them. Check out http://www.ehow.com/how_5266150_make-iphone-apps-earn-money.html to find out how to earn money using apps.
Below are more considerations to look into:
As much as you can, make it a point to look at the kind of procedure or methods that they will be using on your app developing project as this is pretty much a determinant on which road to success your project will be heading.
Also, it is very crucial that you and your app developer will be able to agree upon a time frame in finishing up your project in order to ensure the quality of your app as much as you would ensure its success as well.
And of course, since this is a mobile app, you have to at least be provided for with the kind of design that you would really like for your application. Click here to avail of social sharing app service providers.