Senior System Administrator

Position Responsibilities

• Design, install, configure, and maintain servers, virtualization platforms, storage, and core services (e.g., AD, DNS, DHCP, Group Policy).
• Manage and optimize virtualization environments (e.g., VMware, Nutanix, Hyper-V, or similar) and related storage solutions (SAN/NAS).
• Administer Windows and/or Linux server environments, including patching, hardening, and lifecycle management.
• Implement and maintain monitoring, alerting, and logging systems to ensure reliability and performance.
• Implement and maintain security controls (OS hardening, access controls, patch management, endpoint security).
• Collaborate with security teams to support vulnerability management, incident response, and audits.
• Ensure systems comply with relevant standards and policies (e.g., ISO 27001, NIST, internal IT policies).
• Maintain backup, recovery, and disaster recovery strategies; perform regular DR tests.
• Serve as the highest internal escalation point for complex infrastructure incidents and problems.
• Troubleshoot advanced issues involving servers, storage, virtualization, networking interactions, and authentication services.
• Perform root cause analysis for major incidents and implement long-term corrective actions.
• Develop and maintain technical documentation, runbooks, and standard operating procedures.
• Develop scripts and automation (e.g., PowerShell, Bash, Python, or configuration management tools) to streamline deployment, configuration, and maintenance.
• Evaluate and recommend new technologies, tools, and processes to improve reliability, security, and efficiency.
• Lead or contribute to infrastructure modernization initiatives (e.g., cloud migration, identity modernization, endpoint management).
• Lead and/or serve as technical SME on cross-functional projects, upgrades, and new system implementations.
• Mentor and provide technical guidance to System Administrator I/II and other IT staff.
• Collaborate closely with application, network, and security teams to deliver end-to-end solutions.

Basic Qualifications (Required Skills & Experience)

• Bachelor's degree in Computer Science, Information Systems, or related field; or equivalent combination of education and relevant experience.
• 10-15+ years of progressively responsible experience in system administration, with significant experience in medium to large enterprise environments.
• Demonstrated experience operating as a Tier 3 resource for complex infrastructure issues.
• An active TS/SCI with Polygraph.

Pay Range

$170,000 - $250,000

Benefits

AV offers an excellent benefits package including medical, dental, vision, 401K with company matching, a 9/80 work schedule, and a paid holiday shutdown. For more information about our company benefit offerings please visit: http://www.avinc.com/myavbenefits. We also encourage you to review our company website at http://www.avinc.com to learn more about us.

About the Role

The System Administrator III is a senior technical contributor responsible for designing, implementing, securing, and maintaining the organization’s core IT infrastructure. This role provides Tier 3 support for complex incidents, leads infrastructure projects, mentors junior staff, and ensures high availability, performance, and security of critical systems.