Senior Systems Administrator

As a Senior Systems Administrator, you will ensure the reliability, security, and compliance of mission-critical Windows Active Directory (AD) environments across Comtech-spanning the corporate network and multiple standalone enclaves. Some enclaves are isolated from the broader corporate network and have unique maintenance and compliance requirements. You will lead daily operations, perform structured troubleshooting for technical users and developers, and execute security and compliance tasks aligned to NIST SP 800-53, STIG/SCAP, and ACAS/Nessus while collaborating closely with the ISSO/ISSM., * Workstation & Server Administration: Perform day-to-day support, troubleshooting, software updates, and helpdesk tasks for Windows endpoints and servers.

• Active Directory & Group Policy: Create, apply, and troubleshoot GPOs; manage AD objects (users, groups, OUs); enforce least-privilege access controls.
• Patch & Vulnerability Management: Plan and execute Windows security updates (KBs); run STIG/SCAP tools and security scans; track remediation through closure.
• Vulnerability Scanning: Administer and operate ACAS/Nessus (e.g., Tenable.sc/Nessus) for vulnerability discovery, plugin management, scan scheduling, and results triage; coordinate remediation with POA&M tracking.
• Backup & Hardware Maintenance: Maintain backup software, verify restore procedures, monitor datastore capacity, and coordinate hardware upgrades.
• Structured Troubleshooting: Provide methodical, root-cause analysis for developers and technical users across OS, AD/GPO, network, and application layers.
• Documentation & Change Control: Produce runbooks, SOPs, and configuration baselines; follow change management and incident response processes.
• Security & Compliance Execution: Implement controls under guidance of the ISSO/ISSM; prepare evidence for assessments and audits; maintain continuous monitoring.
• Cross-Environment Operations: Operate across the corporate network and multiple enclaves, including isolated/standalone AD environments, adhering to enclave-specific procedures and maintenance windows.
• Automation (Nice to Have): Use PowerShell to automate workflows (patching, compliance checks, user provisioning/access, reporting).
• Linux Server & Applications (Nice to Have): Administer RHEL/Rocky/Ubuntu servers and common services (NGINX/Apache, PostgreSQL/MySQL, Samba/NFS); enforce SELinux/AppArmor; integrate with AD via SSSD; support container hosts (Docker/Podman).
• DevSecOps Support (Nice to Have): Partner with engineering to embed security in CI/CD (Azure DevOps/GitLab/Jenkins), integrate ACAS/Nessus, SAST/DAST, SBOM/dependency and IaC scans; automate environment provisioning and secrets management (Vault/KMS).
• Other duties as assigned.

• PowerShell scripting/automation for administrative workflows.
• Exposure to NIST SP 800-53 control implementation and continuous monitoring.
• Experience in regulated or classified environments and collaboration with ISSO/ISSM roles.
• Familiarity with virtualization (VMware/Hyper-V) and endpoint security/EDR tools.

Requirements:

• ACTIVE Top Secret (TS) security clearance at time of hire.
• 5-10 years of hands-on Windows systems administration experience supporting endpoints and servers in AD environments.
• Demonstrated experience creating and troubleshooting GPOs and managing AD objects.
• Direct experience applying STIG/SCAP scans and deploying Windows security patches (KBs).
• Hands-on experience administering ACAS/Nessus vulnerability scanning, interpreting findings, and driving remediation.
• Strong understanding of core services: DNS, DHCP, TCP/IP networking fundamentals.
• Experience with backup/restore verification and capacity planning.
• Proficiency with structured troubleshooting and customer-centered support for developers/technical users.

$65.00 - $70.00 per hour Information Technology about 5 hours ago Data Analyst-PowerBI American Cybersystems, Inc. Chandler, Arizona $47.00 - $53.00 per hour

More jobs in Other

Comtech Telecommunications Corp. is a leading global technology company providing terrestrial and wireless network solutions, next-generation 9-1-1 emergency services, satellite and space communications technologies, and cloud native capabilities to commercial and government customers around the world. Our unique culture of innovation and employee empowerment unleashes a relentless passion for customer success. With multiple facilities located in technology corridors throughout the United States and around the world, Comtech leverages our global presence, technology leadership, and decades of experience to create the world's most innovative communications solutions. For more information, please visit www.comtech.com.