Hello,
I’ve carefully gone through your Requirement that you need to build a website for online store to sell product via categories, Sign in, back panel to add new products and sale products, link this store with facebook page. I ’m an expert in PHP, WordPress, Ecommerce, Shoping cart, Magento, Codeigniter, Shopify HTML5, CSS, mobile apps, web development, web design and graphic design, with more than 7 years of similar experience.
I will design very modern and responsive with mobile friendly website that supported all device. I will provide you complete help to develop online store according to your requirement.<< Feel free to contact with me on freelancer chat.
Thanks,
Peter