Website creation and seo

I am looking to create an e-commerce website and optimise it for SEO. Since I was not given any preference on which platform to use, I need someone who is proficient in all available options to find the best one for my needs. The entire project should be up and running within a month. Ideally, I would like the web design to be modern, attractive, and user-friendly. The SEO should be comprehensive, covering areas such as traffic analysis, keyword research, and link-building. Lastly, I would also like some guidance on how to maintain the website in the long run. By hiring a freelancer with the right skills and experience, I will be able to have a functional website with the best possible SEO strategy.