The following represents the details of the tech stack required for developing the instant messaging app:
Programming Language- Erlang, Java, Kotlin, Swift, Objective-C
Automation Framework- RSpec, PhantomJS
Database- PostgreSQL, Mnesia, SQLite
SDK- iOS SDK, Android SDK, Facebook SDK
Protocols- OpenFire, Prosody, Matrix.org, Ejabberd
Hosting- Amazon Web Services, Microsoft Azure