To give you an example, at JSapp.me we can develop a react native MVP app (includes real time social, geoloc, messaging, push notif) for $5000 within 3 weeks.
I opened your page (JSapp.me) and as I scroll down it starts jumping up and down by ~200px uncontrollably. MacOS Beta, Chrome, here
Thank you for the offer, but we are already past that stage, we have the MVP that was built, and need to turn it into a real product with the in-house devs.