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Researchinnovations.Com23d ago

Senior Systems Administrator (Corp205)

United StatesSan AntonioFull-timesenior
DevOps & InfrastructureSystems AdministratorInfrastructure & Cloud
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Quick Summary

Requirements Summary

Top Secret with SCI eligibility Employment type: Full Time Certifications: Must hold applicable DoD 8140 baseline certification (e.g., Security+, CISSP, or equivalent for IAT/IAM roles).

Technical Tools
DevOps & InfrastructureSystems AdministratorInfrastructure & Cloud
Position Title:  Senior Systems Administrator 
Location: Onsite in our San Antonio, Texas office
Clearance Requirement: Top Secret with SCI eligibility
Employment type: Full Time
Certifications: Must hold applicable DoD 8140 baseline certification (e.g., Security+, CISSP, or equivalent for IAT/IAM roles).
 
Research Innovations, Inc. (RII) is breaking through the big, slow, status quo with transformative technology that fundamentally changes and improves the world. We develop cutting-edge software and systems for all levels of the government and military. Using agile development practices and user-centered design, we create innovative solutions for complex real-world problems.
 
Currently, RII is seeking a motivated, mission-oriented Senior Systems Administrator to join our team supporting critical operations in secure facilities at our office located in the Forum Building. We are seeking a hands-on, mid-level Systems Administrator II who can independently administer, troubleshoot, and secure Linux, Windows, and VMware environments in classified settings. This role is for an operator who enjoys deep technical work and takes ownership of system reliability, patching, hardening, and troubleshooting in high-stakes environments.
 
This role requires an active US TS/SCI security clearance.
 
  • Independently administering and troubleshooting SELinux (RHEL 7/8+) and Windows Server systems in offline/air-gapped classified environments.
  • Performing operating system hardening using DISA STIGs and SCAP tools, validating findings, and remediating vulnerabilities with an understanding of security impact.
  • Building, patching, and maintaining physical and virtual servers and workstations (Windows and SELinux).
  • Administering VMware vCenter and ESXi environments, including patching, upgrades, lifecycle management, and troubleshooting in offline/air-gapped networks.
  • Managing Active Directory, including users, groups, GPOs, service accounts, and authentication issues.
  • Performing system and security log analysis, identifying root cause, and implementing corrective actions.
  • Applying RMF and NIST SP 800-53 controls to support ATO maintenance for SELinux, VMware, and Windows systems.
  • Supporting vulnerability scanning, auditing, patching cycles, malware scanning, and documentation of results.
  • Managing and troubleshooting network devices (switches, routers, firewalls) in DoD-compliant environments.
  • Producing and maintaining technical and security documentation aligned with government contractor standards.
  • Providing direct technical support and guidance in secure facilities.
  • Minimum 6 years of hands-on Linux and Windows system administration in production environments.
  • Demonstrated ability to manage users, services, logs, storage, and system troubleshooting on SELinux systems.
  • Hands-on experience administering VMware vCenter and ESXi hosts, including patching and upgrades.
  • Experience implementing and remediating DISA STIGs and validating results using SCAP tools.
  • Experience administering Active Directory and troubleshooting authentication and GPO issues in mixed Windows/Linux environments.
  • Hands-on experience managing firewalls, network switches, and routers.
  • Experience with vulnerability scanning tools and host-based security tools (AV, HIDS/NIDS, SIEM).
  • Experience supporting RMF, IA controls, and ATO-related documentation.
  • Ability to work independently in classified environments with minimal supervision.
    •  
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    Location & Eligibility

    Where is the job
    San Antonio, United States
    On-site at the office
    Who can apply
    US
    Listed under
    United States

    Listing Details

    Posted
    April 3, 2026
    First seen
    April 3, 2026
    Last seen
    April 27, 2026

    Posting Health

    Days active
    23
    Repost count
    0
    Trust Level
    23%
    Scored at
    April 27, 2026

    Signal breakdown

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