Backend Development for A Website

Hello,
I have a project in github and published on vercel the project needs a backend to be completed , my goal is to have a ready for production website

This will include:

- Auth & user role
- Booking system
- Payment system
- Api’s and Backend logic
- Notification & invoice

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You will review the live project, then we will decide on which backend and payment gateway platform is better
( supabase, firebase, Tap..etc )

The price will be a fixed amount on a phase based payment

Regards,