Dear sir,
I see you are looking for a serious Android developer to perform maintenance for your application. I can help you on maintaining your app and make the required modifications until completely done.
I'm an experienced Android developer with 3 years of experience and good profile on freelancer.com. You can check my previous projects and clients reviews on my profile page.
No payment will be asked until full satisfaction. Also, I will provide you free long term support for the tasks required.