I am a fullstack developer specialized many programming languages including Jave for Android and Swift for iOS development.
I will get your app requirements, pay attention to every detail, design in Photoshop and Illustrator, Send you the design for a feedback, start coding the app in Android studio or IntelliJ. I will test your app with Android testing tools both online and using code tests. I will send you the app and you can test it and you can point to me where you like your ads placed. After that we will work on Icons and splash screen designs depending on the ordered Gig.
I have been coding in Android in over 5 years and I now teach others on youtube and Udemy during my spare time. You can take a look at my code teachings. https://www.youtube.com/user/uProSoft