Every day in the classroom is critical to student success. Our substitutes provide important stability in the classroom, ensuring that our students do not miss a moment of valuable learning time. CCSD relies on qualified, enthusiastic substitutes to fill this important role. We also value the unique perspectives that substitutes can bring to the classroom. Working as a substitute is a great way to start your career with CCSD â or to stay connected with the district. There are several types of substitutes in CCSD including guest teachers and support staff paraprofessional substitutes.