System Administrator L3

Job Requirements Saint Louis, MO Top Secret/SCI Polygraph not specified Mid Level Career (5+ yrs experience) Salary not specified Join Premium to unlock estimated salaries

Job Description Job Title:

Systems Admin L3

Location:

St.

Louis, MO Clearance:

TS SCI clearance required Job Description The System Administrator III provides advanced engineering, system integration, and high-level administrative support for secure Closed Area environments. Responsibilities include designing, building, and maintaining enterprise-grade infrastructure—spanning Windows, Linux, virtualization clusters, security controls, and automation pipelines. This role requires independent technical leadership and deep subject matter expertise. Key Responsibilities Research, develop, and implement infrastructure tools and scalable technical solutions Lead development of new processes to improve operational and project efficiency Maintain update services for applications and infrastructure Recommend hardware architecture and enterprise software tools Manage and maintain multiple license server implementations Create, maintain, and support PKI infrastructure; advise customers on PKI-related solutions Build and sustain customer relationships Implement and uphold customer standards and industry best practices Facilitate problem recreation and deep-level failure analysis Present solutions to complex technical issues with consideration for business and operational impacts Participate in team meetings, provide technical insights, and support consensus building Maintain rapid escalation channels for critical issues Maintain hardware infrastructure in secured lab environments Install and support complex applications requiring advanced integration Create, follow, and review process documentation for accuracy and completeness Troubleshoot complex application, system, and integration issues Create and maintain Active Directory and VPN/Remote Access accounts Deploy, maintain, and troubleshoot mandated secure Group Policy solutions Interface with customers, vendors, and SMEs for advanced issue resolution Perform system backups and restores Minimum Qualifications Active DoD TS SCI clearance required CompTIA Security+ CE required Minimum 5 years of experience integrating, configuring, and troubleshooting enterprise technologies Must support both Windows and Linux enterprise environments, including: Extensive Windows Server administration (Server 2019+/Windows 10+) Extensive RHEL 8+ (RHEL 9 a plus) VMware ESXi 7.0+ cluster-level engineering experience required, including: Cluster configuration vCenter management Resource pools High-availability and DRS policies Performance tuning and capacity planning Advanced experience with: Active Directory administration GPO deployment and troubleshooting WSUS and SCCM for patching and compliance Experience administering: PKI infrastructure License server implementations Ability to lead root-cause analysis and resolve complex technical issues Ability to develop new processes and documentation Strong customer-facing communication abilities Highly self-directed and effective in dynamic environments Automation required Scripting proficiency required in: PowerShell Bash Python (preferred) Preferred Qualifications Experience with: HP AND Dell hardware

SCAP/STIG

compliance and EvaluateSTIG Server-based antivirus and data-at-rest encryption Nessus vulnerability scanning Splunk SAN administration Networker Technical documentation writing/editing Ansible, DevOps pipelines, SCCM (advanced usage) Microsoft System Center Service Manager (SCSM) group id: 10529568 N Name Hidden Recruiter Apply now