You may qualify at the GS-11 level, if you fulfill the following qualification requirement: One year of specialized experience equivalent to the GS-09 grade level in the Federal service (experience may have been gained in the private sector) that demonstrates experience: Utilizing Computer-Aided Design and Drafting (CADD) and Geographic Information Systems (GIS) software to create, update, and manage detailed engineering drawings, floor plans, and system layouts for complex facility, utility, or infrastructure projects; and. MISSION ESSENTIAL POSITION: Mission essential employees may be required to report for, or remain at, work in dismissal or closure situations due to adverse weather conditions, natural disasters, or other emergency situations ( e.g., building closure due to power outage) causing disruptions of government operations, and are required to maintain contact with their supervisor during any dismissal or closure situation unless specifically excused by their supervisor.