Dear sir,
I'm very interest about your project and I'm qualified for your project.
I'm Android Senior Developer.
I have rich experience of android app develop for 7 years.
Your project need back-end web service API.
so, App can signin/signup, upload photo, like, comment, etc using RESTful API.
I have full experience of RESTful json based back-end Web service API develop.
I can do it perfectly and no problem,
if you select me, I will show you my best and my effects.
Already I have developed Social photo sharing app very similar as you want.
I'm looking forward to hearing you soon.
Best regards,