The longer you work in the online marketing business, the more you realize how important and symbiotic the relationship is between the marketing and tech departments.  Adam Singer wrote a post for clickz.com which I thought laid out very practically the dependence the two departments have on each other.

Singer’s post provided three Google analytics reports that tech needs to share with the marketing teams or vice versa.

1.    Site speed reports.  Fast loading sites not only provide a superior user experience, they impact your search engine ranking.  It’s a fact that slow loading sites are a major reason why users abandon your site.  If users aren’t hanging around to explore your site, then they can’t buy anything, so no amount of great design or copywriting can help in this case.

In this case, tech and marketing need to know that the slow page load time is affecting the site performance, not the copy or design. 
Singer recommends running Page Speed Insights from Google which will give you suggestions as to how to make the individual pages load faster.

2.    Mobile analytics.  Crashes on mobile are part of life.  The important thing to know is that the crash instance rate should be decreasing with each new version of your app.  Keep an eye on your Mobile App analytics to make sure that it is.

3.    URL errors.  Google Webmaster Tools has just the “tool” to help you identify your missing pages.  These can be deadly for SEO if you have too many of them, but they can also be deadly for the marketing department as this is another way that site users leave you.  The inability to find the page/item they were looking for is another primary reason why people abandon your site.

Make sure if you change products, delete a page, etc. that you have a redirect that keeps users on your site and that keeps you search engine ranking in place.

Tech and marketing departments rely on each other.  Some of the above three tasks are conducted by the marketing team and some by tech.  This is why teamwork is so important.  Working together should be happening more, not less frequently, as time goes on.