Hi,
Nice to bid your project.
This is Sergey, a Senior Full Stack Mobile and Web Developer with 9+years experience.
Through description, I saw you are looking for Mobile App expert who can work on the React.
Because I have sufficient experience of Chatting App based on React and Firebase with flutter, I am sure I can do this job well.
If you give me a chance, I can satisfy all your requirements without fail.
Please check my profile and let me know if you have interest about me.
Hope to work with you.
Regards