Providing assistance at the C-suite level (CEOs, CFOs, CIOs, etc.) requires a deeper level of expertise in the given industry, as well as the ability to work cross-functionally or technically. You must know how to skillfully interface with various departments, uncover potential bottlenecks, and facilitate improvements that help the C-suite function at its highest efficiency. When applying to a C-level executive assistant role, make sure to include evidence of past experience in relevant roles and to demonstrate your ability to catalyze efficient operations.