My preferred (but not limited) development environments/ languages/ frameworks are: Android Studio, IntelliJ IDEA, Kotlin, Java, Korge, Firebase.
Since 2019 I have switched completely to Mobile and Web development and specifically focused on Android OS.
I work hand-in-hand with creative designer, who is really great and together we could create quality and efficient Android app or website.
Examples of published apps are present at Google Play.
We will ensure your project will be treated with high priority and attention, keeping focus on quality and outstanding design.