Systems Admin L3

Systems Admin L3

Clearance: Active DoD SCI 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)

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 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)