Ecommerce Website Backend & Frontend Finalization

I have a frontend ready for a multi-vendor ecommerce website, and I'm looking for a skilled developer to work on the backend and make some final adjustments to the frontend. Backend Requirements: - I need the developer to create a robust backend using Node.js and Express.js. - The backend should handle user authentication and authorization, product and inventory management, and order processing. Frontend Enhancements: - The frontend needs some final touches mainly focused on UI/UX improvements, bug fixes, and performance optimization. - Experience with React.js and Next.js is crucial for making these adjustments. Third-Party Integrations: - The backend should integrate with several third-party services including payment gateways, shipping services, and Email/SMS notifications. - Previous experience with these integrations will be highly beneficial. Ideal Skills: - Proficient in React.js, Next.js, Node.js, and Express.js. - Strong debugging skills and attention to UI/UX details. - Experienced in integrating third-party services, particularly in an ecommerce context.