Developer For Original Cs-Cart Mobile App

I have the license of the default CS-Cart mobile app (written with React Native) and I'm looking for a CS-Cart developer with mandatory experience with such app in order to make some customizations.

It's a good idea that the developer have knowledge with Websocket too, because, among other features, I want to implement a chat in such app using Simtech's Realtime Messenger addon.

Can someone please indicate a company or developer that fulfills such requirements?