E-Commerce App Backend Development

I'm looking for an experienced developer to help me get the backend of my self-built e-commerce app running smoothly. I can provide all necessary login credentials.

Key areas for improvement include:
- Backend Functionality: Ensure all backend processes work seamlessly.
- API Integrations: Set up necessary APIs for payment gateways, shipping services, etc.

Ideal Skills and Experience:
- Strong experience in backend development for e-commerce applications.
- Proficiency in setting up and managing APIs.
- Familiarity with database management and server-side logic.
- Ability to optimize performance and ensure security.

Please provide a portfolio demonstrating similar work.