I actually don't believe he'd be in Ravenclaw anymore, but Hufflepuff. And regarding his career, I have a fic in mind where Teddy is a trainee Healer, but specifically for children, as I think he would be very good with kids being in the Potter's house a lot of the time and having so many younger family members. (Well not technically directly related, but I'm sure he considers them family.) I think he'd be interested in Healing after hearing stories of his dad as well as just hearing about injuries and such from Harry being an Auror and maybe Ginny getting some Quidditch injuries.