Systems Admin L3

Systems Admin L3 Clearance Active DoD SCI clearance required pre-start Location: St. Louis, MO (On-site 5 days/week) Duration: 12 months (expected) Need to be local to St. Louis and available to come on-site. Please read the security clearance requirements carefully as they are non-negotiable. Responsibilities Contract role supporting a secure customer environment. Candidate will be employed by a partner organization (full compensation and benefits provided prior to start). 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 across 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 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 business and operational impact in mind Participate in team meetings, provide technical insight, and support consensus building Maintain 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 secure Group Policy solutions Interface with customers, vendors, and SMEs for advanced issue resolution Perform system backups and restores Minimum Qualifications Active DoD SCI clearance required prior to start CompTIA Security+ CE required prior to start 5+ years of experience integrating, configuring, and troubleshooting enterprise technologies Experience supporting both Windows and Linux enterprise environments Core Technical Experience Windows Server administration (Server 2019+ / Windows 10+) RHEL 8+ experience (RHEL 9 preferred) VMware ESXi 7.0+ (cluster-level): 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 Additional Requirements Ability to lead root-cause analysis and resolve complex technical issues Ability to develop processes and technical documentation Strong customer-facing communication skills Highly self-directed and effective in dynamic environments Automation: Required Scripting 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) Catapult Staffing