Crew trainers mentor new employees at fast-food restaurants, imparting everything they need to know about satisfactory customer service, sharing their wisdom and experience gained on the job.
Working at fast-food restaurants is the very first job for many, so it is safe to assume that a crew trainer is not just someone who gives instructions on daily tasks and restaurant processes. He/She or she often functions as a kind of life coach as well, setting an example of a viable work ethic and a forward-thinking attitude.
Having a high school diploma is more than enough, as far as formal education goes, but you have to know the ropes of your restaurant to be promoted to crew trainer and have experience under your belt at every possible position as a crew member. You know how the cooking equipment and drink dispensers work, you are familiar with taking orders and payments at the counter and in drive-through service alike.
Working hours are flexible, so you can work in various shifts, but forget about the part-time if you want to be a crew trainer. Working on the weekends and doing overtime is more likely. But hey, with the perks come more responsibility.