Sr Systems Administrator

Twenty80 llc; California (MO); On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

Employer-sponsored certification training

Professional development opportunities

Job summary

Twenty80 llc is looking for a Senior Systems Administrator to support secure, mission-critical network environments within a Department of Defense setting. This full-time role, based in Southern California, focuses on enterprise infrastructure administration across Windows and Linux environments.

The ideal candidate will have 5+ years of experience and a Top Secret security clearance. Certification support for further development will be provided. The position offers a structured work schedule providing a three-day weekend every other week.

Qualifications

• Active Top Secret security clearance required.
• 5+ years experience in enterprise systems support.
• Experience administering Windows or RHEL environments.

Responsibilities

• Administer enterprise server infrastructure.
• Develop automation scripts for system optimization.
• Ensure compliance with DoD cybersecurity requirements.

Skills

Enterprise systems administration

Troubleshooting and problem-solving

Active Directory

Virtualization platforms

Education

U.S. Citizenship

Top Secret (TS) security clearance

5+ years of relevant experience

Tools

PowerShell

Bash

Microsoft Windows Server

Red Hat Enterprise Linux (RHEL)

Job description

Role Summary

A government-focused technology organization is seeking a Senior Systems Administrator to support secure mission-critical network and laboratory environments within a Department of Defense (DoD) setting.

This role is responsible for the administration, maintenance, and optimization of enterprise infrastructure across Windows and/or Linux environments. The position supports virtualization platforms, containerized workloads, automation initiatives, and cybersecurity compliance requirements while ensuring reliable system performance and availability.

The ideal candidate will have experience supporting enterprise systems in secure environments and possess an active Top Secret security clearance. Candidates may come from either a Windows administration or Linux administration background, and certification support is available for qualified individuals who do not currently hold advanced platform-specific certifications.

Key Responsibilities

Infrastructure Administration & Support

• Plan, deploy, maintain, and support enterprise server infrastructure.
• Administer Microsoft Windows Server and/or Red Hat Enterprise Linux (RHEL) environments.
• Support Active Directory, enterprise storage, and core infrastructure services.
• Manage virtualization platforms and virtual server environments.
• Support containerized workloads and application hosting platforms.

Automation & System Optimization

• Develop and maintain automation scripts using PowerShell and/or Bash.
• Implement system improvements to enhance performance, reliability, and operational efficiency.
• Monitor infrastructure health and proactively address performance concerns.
• Assist with system upgrades, patching, and lifecycle management activities.

Security & Compliance

• Ensure systems remain compliant with DoD cybersecurity requirements and security standards.
• Support implementation and maintenance of DISA STIG requirements.
• Participate in vulnerability remediation and security hardening initiatives.
• Maintain secure system configurations and operational readiness.

Operations & Troubleshooting

• Provide Tier II infrastructure support and resolve escalated technical issues.
• Troubleshoot server, virtualization, storage, and network-related incidents.
• Support mission and laboratory environments requiring high availability and reliability.
• Document system configurations, procedures, and operational changes.

Required Qualifications

• Active Top Secret (TS) security clearance required.
• U.S. Citizenship required.
• 5+ years of enterprise systems administration experience.
• Experience administering either:
  • Microsoft Windows Server environments, or
  • Red Hat Enterprise Linux (RHEL) environments.
• Experience supporting enterprise infrastructure, virtualization, and system administration activities.
• DoD 8570/8140 IAT Level II certification (e.g., Security+) or ability to obtain/maintain as required.
• Strong troubleshooting and problem-solving skills in enterprise environments.

Preferred Qualifications

• Red Hat Certified System Administrator (RHCSA).
• Microsoft Windows Server certifications.
• Experience with virtualization platforms such as VMware, Hyper‑V, or Nutanix.
• Experience supporting container technologies including Docker or Podman.
• Experience with infrastructure and security tools such as:
  • Rubrik
  • InfoBlox
  • LogRhythm
  • Tanium
  • SCCM/MECM
  • Microsoft Intune
• Experience supporting Department of Defense or other highly regulated environments.

Compensation & Work Model

• Employment Type: Full-time, direct hire.
• Work Model: 100% onsite.
• Location: Southern California military installation environment.
• Schedule:
  • Week 1: Monday–Friday
  • Week 2: Monday–Thursday
  • Provides a three-day weekend every other week.
• Certification Support:
  • Employer-sponsored certification training and development available for qualified candidates.

Growth Opportunity

• Opportunity to support mission-critical government programs in a highly secure environment.
• Exposure to advanced infrastructure technologies, cybersecurity initiatives, virtualization platforms, and enterprise-scale systems.
• Ongoing professional development and certification support available.