The key to how to answer interview questions about your dream or ideal job is that your response should be in line with the characteristics of the job and company you are interviewing with.
Answering this question requires you to consider your strengths and weaknesses, what you have liked and disliked about your current and previous jobs, and what your career ambitions are.
A more general answer will help ensure a fit with the vacant position.
For example:
"My ideal job is one where my knowledge and skills are put to good use. A job where I will learn and grow as a person and an employee and where I am given challenges that test my potential."
You can also take this approach.
"I believe a job is what you make of it. Each position and company has unique characteristics that give meaning and value to that job. If you work hard and make the most of the opportunities given, you will find job satisfaction. I am enthusiastic about a position that allows me to learn and grow and to make a positive and meaningful contribution."