While it is not entirely impossible, it is certainly difficult. Designing an e-commerce website requires serious coding skills. One should not only be a skilled coder, but should also be an excellent website designer. E-commerce websites are not just about code – they involve financial investment which includes buying server space on cloud or other platforms so that you can continuously add content and pages to the website without compromising on its performance, adding payment gateways, adding security protocols to protect customer data and transactions, etc. You must also have an excellent knowledge of backend server programming, cloud server computing, shared services and much more. Thus, creating a large & scalable e-commerce website would be extremely difficult for one person.