Hi there,
Understood your initial requirements mentioned by you. We have more than 6+ developers for RN and JS each holding 5+ years of experience. Also we have core expertise in Expo, ejecting from Expo and implementing In-App Purchase functionality.
Just want to know what kind of solution you are expecting to be developed. Any referral link sharing would be a great help to understand your requirement.
Let's talk further in personal chat at your convenience.
Regards,
Shivlabs
PS. Providing ballpark estimation as of now. After completely understanding your concept, we will provide you precise estimation.