Senior Systems Administrator, TS/SCI w/Poly

Bachelor’s degree in a technical discipline and 15 years of system administration experience. Five years of additional experience may be substituted for a BS. An active TS/SCI w/Poly is required. 5+ years of combined experience in network administration (mid-level) to include working knowledge of Cisco switches on IOS-XE and NX-OS platforms and a solid grasp of networking fundamentals: VLANs, subnetting, TCP/IP, DHCP, DNS, and switching concepts. 10+ years’ experience administering the customer’s classified VDI / thin-client desktop platform 10+ years’ experience in Windows 10 and/or Windows 11 administration and troubleshooting. Strong customer service orientation and clear written/verbal communication. Working knowledge of port security concepts and remediation. Hands-on experience with PXE-based imaging/deployment. Proficiency with PuTTY, PowerShell, and Windows command-line tools. Active Directory user/group administration experience. Strong understanding of patch management processes and vulnerability remediation (IAVA-driven). Experience with endpoint management platforms (SCCM/MECM, BigFix). Familiarity with security baselines and STIG compliance. Exposure to ticketing/ITSM systems JIRA Basic firewall awareness and coordination experience (e.g., Cisco Firepower/ASA). Familiarity with remote administration tools. Understanding of structured cabling, patch panels, and physical connectivity. Basic scripting/automation for repetitive administrative tasks. Required Certification: CompTIA Security+ Preferred Certification: Cisco CCST or CCNA Benefits: Peraton offers enhanced benefits to employees supporting this critical National Security program, which include heavily subsidized employee benefits coverage for you and your dependents, 25 days of PTO accrued annually up to a generous PTO cap, and eligibility to participate in an attractive bonus plan. Mid-level Network / Desktop Administrator to support and maintain enterprise network and end-user computing infrastructure. This is a hybrid role combining hands-on switching and network support with desktop/endpoint administration. The ideal candidate is comfortable working across the stack — from configuring VLANs and port security on Cisco switches to imaging endpoints and troubleshooting Windows 10/11 clients — while delivering responsive, professional customer support to end users. This role balances infrastructure work with day-to-day operational support and requires someone who can work independently on routine tasks and elevate appropriately on complex issues. Configure, maintain, and troubleshoot Cisco switches running IOS-XE and NX-OS. Implement and manage port security, including MAC-based controls and violation remediation. Support enterprise network fundamentals: TCP/IP, subnetting, DHCP/DNS behavior, and Layer 2/Layer 3 troubleshooting. Support and help maintain VDI / thin-client infrastructure, including endpoint provisioning and connectivity troubleshooting. Perform endpoint imaging and deployment via PXE boot and associated deployment tooling. Administer Windows 10 and Windows 11 endpoints, including configuration, troubleshooting, and lifecycle support. Execute patch management and remediate vulnerabilities in response to IAVAs, ensuring systems remain compliant with security baselines and STIGs. Use CLI and administrative tooling — PuTTY, PowerShell, and Windows CMD — for configuration, diagnostics, and routine automation. Support STE/STN environment and associated operational procedures. Perform Active Directory tasks such as account and group management, OU navigation, and basic Group Policy awareness. Document configurations, procedures, and changes; follow existing standards and conventions. Provide high-quality customer service and end-user support, including ticket handling and clear communication with non-technical staff. Coordinate across teams on cross-functional dependencies.

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