Pros
If you don't already understand how a corporation works you will have a chance to develop multiple perspectives. There are many great people at UPMC, you will have a chance to meet and network with some genuine folks who have been around a long time. If you want to be at UPMC for a very long time, this is a great way to embed yourself with the managers and start the political maneuvering that's required for a long career with a large corporation. If you're a fan of the Microsoft Stack UPMC is basically converting to a MS shop. There were never any standards. At one point I just stopped doing work and walked around Oakland for a couple weeks. No one asked any questions. No one wondered about projects. I went 100% Office Space and it was awesome. You'll never have to study or re-learn. Tired of staying relevant in your field? This is perfect for you. Modern tools are shunned. Best practices abhorred and open software is a dirty word. Never again will you have to worry about what the smart people in your field have contributed - because you'll never learn or use it here. Meeting the people is the best part of UPMC.
Cons
Run like this is the plague. After two years the only experience you have is with UPMC and you will not work on your college discipline during this time. To date, this experience has been the most difficult to explain and quantify to employers. E.g. "This is great to UPMC but it does not bring anything to the table for us" Pay is very low. This is marketed as a retention and advancement program. It retains you because you won't be able to find a job for at least two years post-program. This is anathema to your career if you want to work anywhere but UPMC in the first five years after graduating. Doing IT in healthcare makes you a permanent second class citizen. You will repeatedly have to sacrifice standard and form to accommodate for the business needs of other systems. Which sounds reasonable, until you find out you won't be working with a REST API because when the healthcare system was made SOAP was all the rage. Or how you'll have to drop everything to do Meaningful Use or some HIPAA program because last person had 48 months and did nothing for 47 of them. Don't even get me started on the number of silo'd engineers who can't transition work because UPMC has no code review or standards. This will not develop your career. Oh right, also the CIO has an insurance background. He's a nice guy but your division's top leader probably asks his grand kids to turn on his phone for him. It's not an ageism thing, it's willful ignorance - and most management follows this pattern.