Baltimore County Public Schools is looking to hire a Senior Operations Supervisor WMAR and last updated 2021-04-20 13:23:05-04 BALTIMORE COUNTY, Md. â WMAR-2 News is here for you. Baltimore County Public Schools is looking to hire a Senior Operations Supervisor. Some of the duties that the candidate will be responsible for include managing and coordinating custodial and preventive building maintenance programs in schools and offices; ensuring the timely and efficient delivery of services; and supervising professional and administrative support staff. Here are a few minimum requirements: Bachelors degree is preferred, but an associate degree or the equivalent of two years of college coursework from an accredited institution.