Backend for Flutter Grocery App

I am looking for a backend developer with experience in Node.js to build the backend for my Flutter grocery app. The ideal candidate should have knowledge of MongoDB as the preferred database. The main requirement for the project is user authentication and an admin dashboard. Additionally, experience with payment gateway integration and real-time updates would be a plus.

Skills and experience needed:
- Proficiency in Node.js
- Familiarity with MongoDB
- Experience with user authentication
- Knowledge of payment gateway integration and real-time updates would be advantageous.