UNION HEALTH SERVICE, INC. NOTICE OF JOB VACANCY. Position : CMA. Department : Medical Assistant. Status : Full-time. Who we are. Union Health Service is proud to be an employer that has a diverse workforce boasting multi-language skills across the organization, merging different cultures and heritage a proven strategy that comes with a long history of people who have stayed in the company for many years. We have an average length of service of o...