MERN Stack E-commerce Development

I'm looking for an experienced developer to build a robust e-commerce site using the MERN stack. The site will primarily sell Millions of products, like Ali Express.

Core Functionalities:
- Web Designing
- Import bulk products from Ali Express, Ali Baba, Amazon, Temu
- API for above
- Product search and filter
- Shopping cart
- Guest checkout (no user authentication or account management)

Ideal Skills and Experience:
- Proficiency in MongoDB, Express.js, React.js, and Node.js
- Strong background in building scalable e-commerce platforms
- Experience with implementing advanced search and filtering systems
- Familiarity with shopping cart functionalities
- Ability to create a seamless guest checkout experience

Please share relevant portfolio and estimated delivery time.