Need a App Developer

Hello
I need a expert front end and back end developer for my app who can provide me the quality driven work regarding the both sides i.e. Front end and Back end . I need a freelancer who has the good expertise in this field and can give me assured quality work.
Basically I need a social media app like a mixture of facebook and whatsapp in which social part,Business part to be added. I have the source code of this app with some of the api are also developed in it. I need the freelancer who can make changes in the front end and some additional back end work according to my requirements and provide me with fortunate work. For further requirements you can see the attachments it will give you the brief idea what type of app I needed and what features to be added.
Remember I need the quality work and I will not compromise on quality as I need the developer on long term basis because there are many project in my mind to be implemented.
Kindly send me the proposals and also see the attachments!!!

Are you looking to pay or is this a collaboration?
No payment, only collaboration

Do you need to hire for a specific city, country or place?
No, we can work online

When do you want to have the freelancer secured by?
3 months

What is most important for this job?
Quality

How many freelancers do you want to contact you?
10+

Do you have a job specification or creative brief?
Yes (please enter this in the description)

Does the freelancer need insurance?
No

Where did you find Twine?
Google