Add widget to wordpress theme

Hi, I am looking for a wordpress developer to add a widget to each post on the left side, like here [login to view URL];contentBody I want the download button and the specs to appear on each post. I also want to be able to add different values for each post, separate specs and download links for each. And I should do it from the New Post page. The theme is similar to this one [login to view URL] I will send an Adobe Illustrator file for the design of the download button and specs.