Be confident
use buzzwords
know your shit.

So many applicants I've interviewed only tick the first two boxes.

Also, remember you are interviewing them as much as they are interviewing you.

Conversely, for interviewers:

* Confidence
* Buzzword lingo

Those make up the icing on the proverbial cake, the most important part of which is that the interviewee

Know their shit

In retrospect, I probably should've used a different analogy :D