If your application is not large scale, you can have it on a CMS like wordpress and I will definitely provide you your application on that
Services I will provide for this gig will be as follows
1) Development: Well I can give you your product in both the ways, I can make it custom according to your design, or I can use a theme, if you want to integrate any.
2) Products: Well if your going for e-commerce app, I can also give you product uploading service
3) SEO: SEO (Search Engine Optimization) is the best part for a website, all we need a website to improve our sales, and that depends totally on marketing, for that SEO is also a part of digital marketing, I will rank your website on various search engines, like Google, Bing , Yahoo etc, that increase the traffic on your website and probability of sales
4)After Sales: Definitely i will provide free revision, for specific duration that will be discussed during hiring.