Hello,
This is Sajid Ali, I'm a flutter developer with more than 2 years of experience, My experience and expertise can really help you building a chat application,
I've previously built an application which was a chat app as well as calling app too, We used Firebase as a back end of the application, Firebase is the realtime database, That works super fast when it comes to messaging services.
If my offer seems valid to you, I would love to hear from you.
Regards,
Sajid Ali.