Obviously, here we have less experience, since Mobile is not that old, but we do constantly learn and keep up.
Currently, our preferable technology is React Native. We love it for its ability to produce apps for both Android and iOS, for its brother React (which can help if you need both a mobile and a web-app), for its great documentation and support.
However, we have experience with other modern technologies as well: Angular, Flutter, and native ways (Java and Kotlin for Android, Objective C and Swift for iOS).
Please review the applications we worked on here.