Hey Letholas!
The portion of the Server team I lead is responsible for a large portion of the backend software for World of Warcraft. This means we write and maintain many of the software features that put the O in MMO; guilds, the auction house, matchmaking, and the login flow, to name a few. We’re also responsible for all persistent data related to WoW. Meaning, we’re the shepherds of all your characters and items. As a result of that, we work very closely with our partners in Service Technologies & Customer Service to provide tools for helping with all sorts of CS requests.
On top of all that, we’re also big partners to some of the other software teams in understanding backend performance, and making sure that the online player experience stays as reliable as possible.
Hopefully that helps illuminate some of what my team does. Thanks for asking, its a great question!