Hi, my name is Alex and I run a team of 40+ developers.
I see that you need a REST API to be developed.
My team and I have built a custom REST API for an Australian startup - https://madpaws.com.au. We helped them create all the back end features using PHP framework Laravel, front end with React JavaScript, a RESTful API and an Ionic (Angular) based mobile app.
Your project seems to be very interesting and I would love to know more details about it.
Reach out and let's discuss the project in more detail!
Reach out,
Alex