SMX is seeking a skilled Windows System Administrator to support a small RDT&E lab environment, managing all end-user devices and servers. The ideal candidate will work directly with the ISSO and cybersecurity team to maintain secure, compliant operations. Duties include but are not limited to system administration, patching, vulnerability scanning, account management, and documentation support. This position requires a DoD secret security clearance with top secret eligibility. US citizenship is required for work on DoD contracts.