Kinda, my wife is substitute teaching currently. She has her secondary teaching certificate (6th-12th), but there isn't as much of a demand for English as some of the other disciplines. Schools to stay away from or go to depend on the area. I don't want my wife teaching at AISD again, but again elementary might be better then her school.
Eanes ISD (Westlake) is good, and so is Lake Travis (LTISD). What side of town are you going to be living? Other schools are Dripping Springs, Georgetown, Cedar Park, and Round Rock.