So while writing a controller for my scheduler, I was wondering which is cleaner, should I make a post call to trigger a job? or a get call?
A post is semantically better than get, because the concept of a job is to do some processing rather than getting something for you.
If your api method intended to just get/retrieve some data to the caller, then it wouldn't look like a job at all.
You may also have a get and a post altogether, where the post will do the job, and get will return the result of that job.