Problem with trying to find a job from afar,is that if your looking to be working horses the farm hiring is going to want to see you actually ride & interact with the horses
They need to see if they like what they see as far as your abilities/horsemanship. I have a friend that trains & breeds,this last summer he had a VERY hard time finding assistant that was competent enough in their riding skills to help start colts. Sure they All came thinking they were great riders
but didn't really have the knowledge or confidence they thought when it came first rides & schooling/training young horses how to find body control,impulsion etc.
This site sometimes has postings. NorthernHorse Want Ads
Other thing is to try e-mailing farms of interest
see if they have any horse related jobs available or if they may know of any. I had a website & I know I use to get inquirys like that.I wasn't in need but I do know I had on occasion forwarded e-mails to follow breeders,ranch owners that may have interest