What's his occupation?
He is a waiter (for a woman, you should say waitress).
What is her job?
She's a model.
Is she a teacher or a salesperson?
She is a salesperson.
Is she a soldier or a nurse?
She is a nurse.
What's her profession?
She's a veterinarian / a vet.
What's her job?
She is a teacher.
What's her job?
She's a police officer (or an officer or a policewoman).
What does he do?
He's a pilot.
Is she a pilot or a flight attendant?
She's a flight attendant.
What does he do for living?
He is a dentist.
What does he do for living?
He's a soccer player.