Here's a great discussion from 2014 with some examples of email-focused interview questions. Matt Byrd's reply has inspired a few interviews I've held in the past.
Good luck at your interview!
Hey Luke - I just had this happen to one of my campaigns. After some troubleshooting, I found that it was actually a group of tables that were causing the issue. I put the tables all within their own <td> within a container table and it solved the problem.
Hope this helps!
Hey Jake - while your email is by no means small, 115KB shouldn't be affecting deliverability alone. Is it possible there are issues or irregularities in your code that could be triggering spam filters?
Here's a helpful write-up from ET that I'll sometime reference regarding email file size: http://www.exacttarget.com/blog/email-file-size-guidelines-time-for-your-checkup-part-1-of-3/
Unfortunately I don't have a template to share as I built ours myself. A simple search should yield enough to get you started but I would recommend building out your tabs/sheets first (open rates, click rates, subscriber growth, etc.) then creating any charts you think you need and copying them onto the main dash tab - you can delete them from the raw data tabs as they will update automatically once copied. Hope this helps!
I've recently begun using Google sheets for email reporting. The first tab is a dashboard view of various charts and graphs for things like subscriber growth, top performing brands, engagement scatter, etc.
Below each chart is a link to a corresponding tab that contains the raw data that I input after each campaign - so far, everyone on our marketing team really seems to like this way of reporting regardless of their tech acumen.