Epic is now working on switching to web technologies for the front-end, so if you're not one of the unlucky ones to be stuck on a purely core team, you'll get time writing Javascript and the like.
but web doesn't necessarily mean modern in any sense of the word.
[1]aside from being a long-suffering user of Meditech, I am also a long-suffering user of Epic, who had the misfortune of going through "mandatory Epic training" at 4 separate institutions that were transitioning to it from Meditech, or pencil and paper. I am still not sure which of the three systems were the most technologically advanced...
The fact that they're moving away from VB6 to a web-based front-end in 2017 should be reason enough to assume that whatever they come out with is going to be excruciating.