Depends on the type of show you are on.
Directors, producers of various degree and responsibility, camera operator, camera assistant, electricians, grips, makeup, hair, assistant directors, production managers, line producers, stage managers, casting directors, executive assistants, broadcast standards and practices, development personnel, production assistants, special effects, prop masters, production designer, editors, assistant editors, graphics, music producers, composers...
I could go on for quite some time. I've worked in TV and Film for over 15 years in movies, reality TV, docu-reality TV, Live TV and assorted other types of productions.
Reading lines with actors does not exist as a paying job. Directors will go over scenes with actors and acting coaches will work with actors on their parts and characters. That's about the closest to what you're describing.
15 years in TV and Film