Appstem is an IT company that boasts a design studio in San Francisco, CA. Being so close to Silicon Valley, this agency is fascinated by the latest mobile technology. When it comes to building mobile applications for American clients, this firm charges reasonable fees. Android Studio and Google Firebase are programs that allow developers to save money, effort and time on the design and management of apps for this mobile platform. Java is the dominant programming language that defines the framework of apps for Android smartphones, tablets and other gadgets. As an open source syntax, Java is very flexible and easy to edit in the long term. The programmers at Appstem take full advantage of debugging tools that can validate the codes and scripts that are written in this language. The final step in Android app design must include a publication on Google Play, which is one of the world's leading mobile marketplaces.