Systems Admin L3

Job Requirements Saint Louis, MO Top Secret/SCI Polygraph not specified Career Level not specified Salary not specified Join Premium to unlock estimated salaries Job Description 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) group id: 10529568 N Name Hidden Technical Recruiter Apply now