We recently converted our site, from a Joomla Virtuemart site to a Magento site. Immediately after migrating the site, our google search traffic dropped dramatically, by about 60% of the original search volume.
Looking at our webmasters account, we are getting a number Crawl errors and other errors that are causing this big drop in traffic. We are looking for an experienced SEO professional to fix these errors and help us to get the original traffic back to the site.
All of the original content has been migrated to the new site, however the old site still exists as well on a subdomain that is currently disallowed for indexing.
To be considered, please let me know exactly your plan to fix the problem.