Senior Systems Administrator (Corp205)

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 Systems Administrator II 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.

What You Will Be Doing

• 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.
  
  

What You Have Done

• 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.
  
  

At RII, we believe that diversity in our workforce is critical to our success. We strive to hire great people from a wide variety of backgrounds, not just because it’s the right thing to do, but because it makes us stronger. We work to help your intellectual passions and creativity thrive. It’s one of our core values: Let your geek flag fly.

We also offer all employees comprehensive benefits including: flexible work schedules, health insurance coverage, paid time off, 401k with a company match, paid parental leave, access to wellness programs and much more. You get this all from day one, and all paid for by RII.

It’s all part of another of our core values: Stay human. It’s why our comfortable and colorful offices such as our headquarters, include a community game room, pantry, massage chair, and an escape room, among other amenities. It’s why we have community ambassadors and regular community events.

Research Innovations, Inc. is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender, gender identity or expression, national origin, genetics, disability status, protected veteran status, age, or any other characteristic protected by state, federal or local law.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.