Complete C8 Backend API Integration

I have already designed and built most of C’8 – Coordinate, an open-source aid-coordination platform you can preview here: https://www.c8coordinate.com. The interface is in place; where I need help is on the backend... (Budget: $15 - $25 USD, Jobs: API Development, Backend Development, Database Management, Documentation, Git, Open Source, RESTful, Software Development)