I think that Epic would be good to work for.
(They are NOT an insurance company — not sure where those comments are coming from...)
They produce and maintain electronic medical records systems, which is extremely broad and complicated, so they probably have a very wide range of needs for employees. They have been around for years. The company is doing very well.
Their original databases are MUMPS based (and still are, though they also have SQL interfaces to those databases now), but that is all just one aspect of what Epic does.
I imagine that most of their programmers do not know MUMPS now. They use a lot of Visual Basic, and a lot of web programming. They have many products. Their systems are used by many big medical centers, Mayo, Kaiser, many med school clinic systems, on and on. They are probably the number one medical record system in the world.
Despite their liberal tendencies, they are “nice” and would be a good company to work for.
They unfortunately have gotten so big and entrenched with huge clinics and hospitals that they have lost their old advantage of being nimble. They have evolved from a responsive company to one that has such a mission critical user base to support that they have not, in my opinion, been innovative for years. They get by because all the other medical software companies are generally even worse. They need good people who will tell them the Emperor is naked!
If you have a lot of common sense and creativity you might end up feeling frustrated (just a guess) at trying to turn the Epic supertanker with your work.
I suspect we are not telling you anything you don’t already know, but maybe are validating some things...
Maybe that's why they do the "superhero" schtick on their careers page, lol. Nobody but Superman (Epicman?) could do that. In a past technical life I really put some kick into the pants of some database-centered processes with the hi tech redneck's secret formula. (AKA a custom main memory database manager.) If those guys aren't doing something like this all over now, I'll have to ask why.