SimVentions, Inc. seeks a System Administrator to support Defense & Aerospace IT and cybersecurity operations. In this role, you will install, configure, and maintain secure Windows and Linux servers, virtual environments, and networks supporting DoD missions. You'll manage user accounts, patching, backups, and incident response while implementing security controls, STIGs, and RMF requirements. Collaborate with engineers and cybersecurity specialists in a family-like, values-driven culture focused on integrity, teamwork, and mission success, with strong opportunities for growth and learning.