Full-Stack Digital Storefront Build

I need a modern, fully responsive e-commerce website dedicated to selling digital products—primarily downloads or license keys. Once a customer completes checkout, an automated email must deliver a secure download link, so that flow has to be seamless and reliable.

Core requirements
• End-to-end development: frontend, backend, database, and an intuitive admin dashboard for products, orders, customers, and inventory.
• Cart, product search and filtering, and user authentication.
• Single active payment option at launch: bank transfer. (Please architect the code so additional methods such as cards or PayPal can be plugged in later without major refactoring.)
• Fast loading, fully responsive layout that looks and works great on mobile, tablet, and desktop.
• Clean, well-documented code that follows best security practices, including input validation, encrypted credentials, and HTTPS readiness.

Acceptance criteria
1. A customer can browse, search, add digital items to cart, pay via bank transfer, and automatically receive an email with a unique download link.
2. Admin dashboard lets me create/edit products, track orders, view customers, and manage stock of license keys.
3. Site passes Google Lighthouse performance score of 90+ on mobile and desktop.
4. Codebase is handed over in a private Git repo with setup instructions and brief documentation.

I’m flexible on the tech stack—React, Vue, or another modern framework on the front end and a reliable REST or GraphQL API on the back end are all fine—as long as the final result meets the criteria above.