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# Sr. Linux & Windows System Admin

- **Company:** Zachary Piper
- **Location:** Annapolis Junction, MD, United States
- **Experience:** Expert
- **Salary:** $140,000 - $200,000
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, CompTIA Security+, Cyber Security, Linux, Monitoring of Systems, Network Security, Log Analysis, Windows Servers, Server Administration, Software Vulnerability Management, Software Troubleshooting, Patch Management, Nessus, Hardware Infrastructure, Splunk, Vulnerability Analysis
- **Published:** October 31, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9281041/sr-linux-windows-system-admin

## About the Role

* Minimum 10 years of System Administration experience supporting enterprise environments.

 * Strong experience administering both Linux and Windows operating systems.

 * Hands-on experience with IT security compliance, auditing, and cybersecurity best practices.

 * Experience utilizing Splunk and/or Nessus for security monitoring and vulnerability management.

 * Active TS/SCI with Full Scope Polygraph (FSP) required.

 * Security+ CE or higher certification required.

 * Strong troubleshooting, analytical, and problem-solving skills.

 * Experience supporting secure, mission-critical environments is highly preferred.

## Description

Piper Companies is seeking a Sr. Linux & Windows System Administrator to support a mission-driven organization within the government contracting and cybersecurity industry. The Sr. Linux & Windows System Administrator will be responsible for maintaining secure, compliant, and highly available enterprise environments while supporting critical infrastructure, security monitoring, and vulnerability management initiatives. The Sr. Linux & Windows System Administrator role is a long term open ended contract opportunity and requires you to work onsite in Annapolis Junction, MD. An active TS/SCI with FSPG is required for this role., * Administer, maintain, and troubleshoot enterprise Linux and Windows server environments.

 * Monitor system performance, availability, and security across multiple environments.

 * Support IT security compliance initiatives and ensure systems adhere to organizational and regulatory standards.

 * Utilize Splunk for log aggregation, monitoring, analysis, and security event investigations.

 * Perform vulnerability assessments and remediation activities using Nessus and related security tools.

 * Implement system patches, upgrades, and configuration changes while minimizing operational impact.

 * Collaborate with cybersecurity, engineering, and operations teams to improve system security posture.

 * Develop and maintain technical documentation, configurations, and standard operating procedures.

 * Participate in troubleshooting efforts for hardware, software, network, and infrastructure issues., Linux Administration, Windows Server, System Administration, Splunk, Nessus, Vulnerability Management, Security Compliance, Cybersecurity, Security+, Security Plus CE, TS/SCI, Full Scope Polygraph, FSP, Enterprise Infrastructure, Server Administration, Incident Response, Log Analysis, Patch Management, Risk Mitigation, Information Assurance, Infrastructure Support, Network Security, Government Contracting, Security Monitoring, Troubleshooting, Active Directory