I have been developing android app since 2015. Since I have discovered the power of coding android I couldn't spend time without coding. I have worked on many projects. The last one is a NASA project completed some days ago.
I have also personal projects available on play store. With my two years experiences I can correctly build and use REST APIs, Databases and Maps.
Chances that your app uses one of these three modules are great. If you want your work done by a professional, just let me do it.