Add Structured Data in the form of Microformats and Microdata wherever applicable on the site
Page Load Time
301 and 302 Redirects
Dynamic URL Structure
Subdomains v/s Subfolders
Customized 404 (Page Not Found) Page
Work on Improving the Site Speed
Add Authorship Markup to the blog
Add Twitter Cards and FaceBook open Graph meta data to the blog
Guide the web developer to implement microformats or schemas for products and reviews.
Technical factors influence the search engines to crawl and index the website efficiently. This in the long run have a great impact on how the search engine will determine the search presence of the site.