Improve Android App Repository

I maintain an open-source Android application hosted on GitHub that mixes Kotlin, native C/C++ (via JNI/CMake), and a small Python utility layer. I’m ready to take the next step in quality and functionality and need a seasoned developer who is comfortable jumping across those three languages... (Budget: $25 - $50 USD, Jobs: Android, Android App Development, Android Studio, GitHub, Java, Kotlin, Mobile App Development, Python)