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I'm in the process of preparing my company's ecommerce site for a redesign - largely to move to a responsive design and improve issues with UI and some much-needed features. This is a very small ecommerce business (Less than $300K annually), and we have settled on Magento Community Edition for our platform. We understand it to be very "SEO" friendly,  and its similar to our current platform - it gives us a lot of flexibility in design, and it appears scalable. While I am aware of our current sites shortcomings (from an SEO standpoint), I was wondering if I should employ an SEO person/company to do a pre/post redesign audit. I looked at the MOZ checklist, and ran my site through Hubspot and WooRanks free tools, and am aware of what they are reporting as SEO items to be fixed. As I am so small, I was wondering if an SEO audit in addition to what I already know might be overkill? Any thoughts/suggestions are welcome.

I'm a new member of Moz, and am trying to understand why I am seeing my sites URL's in my Inbound Link results in Open Site Explorer. There are quite a few, and they are all product category URL's that are generated by my stores database. This is not happening with .html URL's. Any thoughts?