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Systems Admin L3

Contract Type: Contract

Posted Date: April 23, 2026

ECCO Select is a talent acquisition and consulting company specializing in people, process and technology solutions. We provide the talent behind the technology enabling our clients to achieve their goals. For more information about ECCO Select, visit us at www.eccoselect.com.

Position Title:      System Administrator III

Location Information  

St. Louis, MO (Onsite)

Position Responsibilities:


The System Administrator III is responsible for advanced engineering, system integration, and high-level administrative support within secure environments. This position will focus on building, designing, and maintaining complex, enterprise-grade infrastructure with an emphasis on stability, security, and automation. You will be a technical leader, independently driving initiatives to enhance system capabilities and operational efficiency through process improvement and customer engagement.

  • Research, develop, and implement infrastructure tools and robust technical solutions to meet evolving enterprise needs.
  • Lead the creation and optimization of new processes to enhance both operational and project efficiency.
  • Maintain, update, and ensure the smooth functioning of applications and infrastructure.
  • Provide technical recommendations on hardware architecture and enterprise software toolsets.
  • Manage multiple license server implementations and associated administration tasks.
  • Create, support, and maintain Public Key Infrastructure (PKI) systems; provide expert consulting on PKI solutions for customer needs.
  • Foster and maintain positive relationships with end-users, customers, vendors, and subject matter experts.
  • Ensure compliance with customer standards and industry best practices through documentation and system configuration.
  • Lead deep-dive root-cause analysis, failure simulations, and troubleshooting of advanced technical issues impacting systems and applications.
  • Communicate and present effective solutions to complex technical issues, weighing business and operational impacts.
  • Participate in team meetings, offering technical insight and fostering consensus among stakeholders.
  • Serve as a rapid escalation point and maintain readiness to address urgent critical issues impacting services.
  • Support and maintain physical hardware in secure lab or closed area environments as assigned.
  • Install, configure, and support highly integrated and mission-critical applications across platforms.
  • Develop, follow, and review process documentation to ensure procedural accuracy and completeness.
  • Troubleshoot application, system, and integration issues with a focus on reducing incidents and delivering sustainable solutions.
  • Account creation and support for Active Directory, VPN, and remote access, including secure Group Policy deployments.
  • Implement, maintain, and troubleshoot mandated secure Group Policy Objects and solutions required for compliance.
  • Perform system backups, restorations, and ensure contingencies are in place to maintain system integrity.

 

Essential Skills, Experience

  • Active DoD SCI Clearance required prior to start.
  • CompTIA Security+ CE certification required prior to start.
  • Minimum of 5 years’ experience integrating, administering, configuring, and troubleshooting enterprise technologies in a highly secure environment.
  • Demonstrated proficiency supporting both Windows and Linux enterprise environments, including:
    • Extensive experience administering Windows Server 2019+ and Windows 10+ environments.
    • Strong experience with Red Hat Enterprise Linux (RHEL) 8+, with RHEL 9 considered a strong plus.
  • Hands-on expertise with VMware ESXi 7.0+ cluster-level engineering, including vCenter management, resource pools, high-availability/DRS policies, and performance optimization.
  • Advanced experience managing Active Directory, Group Policy Objects (GPOs), and troubleshooting related issues.
  • Experience with enterprise-level patching and compliance using WSUS and SCCM.
  • Administration of PKI environments and license servers.
  • Demonstrated ability to perform deep root-cause analysis and deliver resolutions to complex technical problems.
  • Process development and documentation skills for continually improving operational workflows.
  • Exceptional communication abilities, with an emphasis on customer-facing interactions and cross-functional teamwork.
  • Strong self-direction; able to work independently and effectively in fast-paced, continually evolving settings.
  • Required automation experience, with scripting proficiency in:
    • PowerShell
    • Bash
    • Python (preferred)

Qualifications:

  • Experience with HP and Dell hardware platforms.
  • Familiarity with compliance tools and standards, including SCAP/STIG, EvaluateSTIG, and configuration compliance processes.
  • Knowledge of server-based antivirus, data-at-rest encryption, vulnerability assessment (e.g., Nessus), and logging platforms (e.g., Splunk).
  • Hands-on experience with SAN administration, Networker, and technical documentation (writing and editing).
  • Advanced use of Ansible, DevOps automation pipelines, and SCCM.
  • Exposure to Microsoft System Center Service Manager (SCSM) is advantageous.

ECCO Select is committed to hiring and retaining a diverse workforce. Our policy is to provide equal opportunity to all people without regard to race, color, religion, national origin, ancestry, marital status, veteran status, age, disability, pregnancy, genetic information, citizenship status, sex, sexual orientation, gender identity or any other legally protected category. Veterans of our United States Uniformed Services are specifically encouraged to apply for ECCO Select opportunities.

Equal Employment Opportunity is The Law
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