No. The Stack Exchange concept of Questions and Answers centers around archive quality -- the ability of content to stand the test of time and be relevant to the next visitor. Feedback on your current projects would quickly be out-dated. Mobile device renderings of your site aren't something that would end up in an encyclopedia, so they don't belong on Stack Exchange.
SE doesn't try to be a place for all the worlds questions, much less all the things they just generally want or need. It's a niche thing.
You can find a full list of sites in the SE network here. You may sort by category, then for any of them that interest you I suggest reading the
/faq pages for each as they will have specific details about what is and is not in scope for each site.