Senior Systems Administrator, TS/SCI w/Poly

Senior Systems Administrator, TS/SCI w/Poly Job Locations US-MD-Annapolis Junction Requisition ID 2026-169464 Position Category Cyber Security Clearance Top Secret/SCI w/Poly Responsibilities 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 escalate 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. #AJCM #PeratonRoyalMove #MPOJobs #MDFSP Qualifications 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. Peraton Overview Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy.

As the world's leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace.

The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can't be done by solving the most daunting challenges facing our customers. Visit peraton.com to learn how we're keeping people around the world safe and secure.

Target Salary Range $146,000 - $234,000. This represents the typical salary range for this position. Salary is determined by various factors, including but not limited to, the scope and responsibilities of the position, the individual's experience, education, knowledge, skills, and competencies, as well as geographic location and business and contract considerations.

Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay. EEO EEO: Equal opportunity employer, including disability and protected veterans, or other characteristics protected by law. Options Apply for this job online Apply Share Email this job to a friend Refer Sorry the Share function is not working properly at this moment.

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