System Administrator L3

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)