Greetings,
We have read your project. We are a team of developers who work exclusively on Android. We are aware of Google's latest design guidelines and strategies in UI/UX. We would love to work on your project.
We already have the Android app for IM which allows sending files, images, stickers. Also, it allows to add friends, create groups.
We can communicate more to customise this app for your needs.
Regards
Sam