For anyone interested in working in Yellowstone they have just opened up the posts for 2019:
https://careers-xanterra.icims.com/jobs/search?ss=1&searchCompany=4271&utm_source=RPI&utm_medium=email&utm_content=86825&utm_campaign=YNP_181023_Newsletter_Guest&PID=54977996&PN_email=2QJOkLt3YUPbUmvhVczv4Pmg1tRRxVDw5pr9vrrJjcfAzYLaNcThnefmjmEd4R4xM2siAX0g6IkM1k5NqXybdFi804e8g2sGq8dnBIQkDl0%3D&mobile=false&width=1171&height=500&bga=true&needsRedirect=false&jan1offset=-480&jun1offset=-420
https://careers-xanterra.icims.com/jobs/search?ss=1&searchCompany=4271&utm_source=RPI&utm_medium=email&utm_content=86825&utm_campaign=YNP_181023_Newsletter_Guest&PID=54977996&PN_email=2QJOkLt3YUPbUmvhVczv4Pmg1tRRxVDw5pr9vrrJjcfAzYLaNcThnefmjmEd4R4xM2siAX0g6IkM1k5NqXybdFi804e8g2sGq8dnBIQkDl0%3D&mobile=false&width=1171&height=500&bga=true&needsRedirect=false&jan1offset=-480&jun1offset=-420