Senior Systems Administrator

Parallax Advanced Research; Beavercreek (OH); On-site; USD 90,000 - 130,000; Full time

Job summary

Parallax Advanced Research Corporation seeks a Senior Systems Administrator to lead administration, security, and modernization of the enterprise server and computing infrastructure supporting its operations and programs. The role serves as the senior escalation point for infrastructure issues and drives critical projects with cybersecurity and engineering teams.

This exempt, full-time, on-site position requires 8+ years of enterprise experience, strong Windows/Linux expertise, and the ability

Qualifications

• Bachelor's degree or equivalent professional experience.
• 8+ years enterprise systems administration experience.
• Advanced Windows Server and Active Directory/Group Policy administration.
• Experience with VMware or Hyper-V, storage, backup and recovery.
• Networking fundamentals and system hardening experience.
• Scripting in PowerShell, Bash, or Python.
• Ability to lead technical projects and coordinate across teams.
• Ability to obtain and maintain U.S. Government security clearance.

Responsibilities

• Lead deployment, administration, and lifecycle management of Windows and Linux servers.
• Manage AD/GP, DNS, DHCP, certificates, and secure authentication; support Entra ID and hybrid identity.
• Maintain VMware/Hyper-V platforms; ensure high availability and disaster recovery.
• Lead patching, configuration management, and security controls for CUI environments.
• Collaborate with cybersecurity and engineering teams on incidents and audits.
• Automate deployments with PowerShell, Bash, Python, or Ansible where applicable.

Skills

Enterprise systems administration

Windows Server administration

Active Directory / Group Policy

Linux server administration

VMware / Hyper-V

Networking fundamentals

Scripting (PowerShell, Bash, Python)

Security/compliance (CUI, NIST, CMMC)

Project leadership

Security clearance eligibility

Education

Bachelor's degree or equivalent professional experience

Tools

VMware vSphere/ESXi

vCenter

Hyper-V

Active Directory

DNS

GPO

Entra ID

Job description

Parallax Advanced Research is an Equal Opportunity Employer, drug free workplace, and complies with ADA regulations as applicable.

Position Title

Senior Systems Administrator

Effective Date

11-1-26

FLSA Status

Exempt

Employment Status

Full-Time

Work Location

On-Site

Location

Parallax HQ: 4035 Colonel Glenn Hwy, Beavercreek, OH 45431, or Huntsville, AL [TBD]

Position Summary

The Parallax Advanced Research mission is to deliver innovative research and provide technology, human, and business solutions through The Science of Intelligent Teaming™ for government, industry, and academic clients.

The Senior Systems Administrator leads the administration, security, reliability, and modernization of the enterprise server and computing infrastructure that supports Parallax corporate operations, research laboratories, data centers, and government-sponsored programs. This role serves as the senior technical escalation point for server and infrastructure issues, drives infrastructure projects, shares expertise with less experienced administrators, and partners with cybersecurity and engineering staff to protect sensitive systems and Controlled Unclassified Information (CUI). This is an individual contributor position with no supervisory responsibilities.

Essential Duties and Responsibilities

The essential functions include, but are not limited to the following:

Systems Administration & Identity

• Lead deployment, administration, and lifecycle management of Windows Server and Linux systems across physical, virtual, and isolated research environments.
• Administer Active Directory, Group Policy, DNS, DHCP, identity services, file permissions, certificates, and secure authentication, and support Entra ID and hybrid identity.
• Maintain VMware vSphere/ESXi, vCenter, Hyper‑V, or comparable platforms, including clustering and high availability.

Storage, Backup & Recovery

• Manage enterprise storage, SAN/NAS connectivity, server hardware, and backup and replication platforms.
• Test restores and disaster recovery procedures on a regular schedule and keep recovery plans current.

Security & Compliance

• Lead operating system patching, firmware upgrades, configuration management, vulnerability remediation, and secure baseline implementation.
• Implement system security controls supporting CUI protection, NIST SP 800-171, CMMC Level 2, and applicable federal and contract requirements.
• Partner with cybersecurity staff on logging, endpoint protection, access reviews, incident response, and STIGs.
• Provide documentation and evidence for internal audits, customer reviews, and compliance assessments.

Incident Management & Operations

• Serve as the senior escalation point for critical server incidents and lead root cause analysis and fixes.
• Automate administration and standard deployments with PowerShell, Bash, Python, Ansible, or comparable tools, and maintain monitoring and alerting.
• Follow change management procedures for planned changes and maintenance windows, including after-hours work.

Infrastructure Planning & Technical Leadership

• Lead infrastructure refreshes and capacity planning, and maintain diagrams, inventories, and procedures.
• Evaluate products, work with vendors, and manage server hardware and software lifecycle, warranties, and licensing.
• Share technical expertise with less experienced administrators.
• Follow all requirements for handling CUI and classified information and systems.
• Other duties as assigned.

Minimum Qualifications (Knowledge, Skills, and Abilities)

• Bachelor's degree in computer science, Information Technology, Cybersecurity, or a related field; equivalent professional experience may be considered.
• 8+ years of progressively responsible enterprise systems administration experience, including leading complex infrastructure initiatives.
• Advanced hands‑on Windows Server and Active Directory/Group Policy administration, with demonstrated Linux server support experience.
• Experience with VMware or Hyper‑V, physical servers, enterprise storage, backup and recovery, system monitoring, and infrastructure troubleshooting.
• Working knowledge of networking fundamentals, DNS/DHCP, identity security, access controls, patch management, and system hardening.
• Scripting and automation experience with PowerShell, Bash, or Python.
• Demonstrated ability to lead technical projects, document solutions, and coordinate across teams.
• Ability to obtain and maintain a U.S. Government security clearance as required by assigned programs.
• Availability for scheduled after‑hours maintenance and on‑call support for critical incidents.

Preferred Qualifications (Knowledge, Skills, and Abilities)

• Microsoft Windows Server Hybrid Administrator, VMware VCP, RHCSA, Security+, or equivalent advanced systems credentials.
• DoD 8140 qualification (for example, Security+ CE) for privileged access to DoD systems.
• Experience supporting DoD or federal programs, CUI environments, classified systems, research laboratories, or high‑performance computing.
• Familiarity with CMMC Level 2, NIST SP 800-171/800-53, RMF, DISA STIGs, vulnerability assessments, and audit preparation.
• Experience with Entra ID, Microsoft 365, Azure hybrid infrastructure (including GCC High), enterprise backup tools, and secure enclaves.
• Active Secret clearance or higher.

Physical Demands and Work Environment

The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this position. Reasonable accommodation may be provided to enable individuals with disabilities to perform the functions. Office, laboratory, and data center work, including occasional lifting of server and network equipment up to 50 pounds. Occasional after‑hours maintenance. Travel up to 10 percent, which may flex during projects.