Windows/Linux System Administrator

*Applicants must posses a Secret Clearance for consideration*

Zachary Piper Solutions is currently seeking a Windows/Linux System Administrator to support a mission-critical enterprise communications program based in Annapolis Junction, MD . This position is a full time 100% onsite due to operational and security requirements. This role is critical in ensuring the availability, performance, and security of enterprise telephony systems that operate in a 24x7x365 environment. As a Windows/Linux Systems Administrator, you will play a pivotal role in maintaining highly available voice infrastructure, supporting call center technologies, and ensuring compliance with strict security and uptime standards.

Key Responsibilities:

• Manage and support enterprise telephony systems across multiple programs, including hardware, software, peripherals, and call applications such as WFO/WFM, CMS, and call recording platforms.
• Install, configure, operate, monitor, and maintain enterprise infrastructure, including:
  • Web servers (e.g., IIS)
  • Application servers
  • Telecom hardware (e.g., Dell PowerEdge servers, Avaya J-Series phones)
• Install, configure, troubleshoot, and resolve issues related to:
• Telephony platforms
• Windows and Linux server environments
• Network connectivity and integrations with Active Directory, DNS, DHCP, and LDAP
• Collaborate with cross-functional engineering, networking, and security teams to deliver telephony solutions that ensure:
  • High availability
  • Call quality
  • Compliance with security and performance standards
• Apply regular and emergency patches to Windows and Linux systems to maintain security and compliance.
• Perform system upgrades and migrations, including planning, testing, and execution.
• Conduct routine system health checks and preventive maintenance activities.
• Coordinate with cybersecurity teams to address audit findings and implement remediation actions.
• Participate in a rotational on-call schedule and meet recall requirements to support systems requiring continuous uptime.
• Perform other duties as assigned in support of mission objectives.

Requirements:

• Active Secret Security Clearance (required)
• Due to contract requirements, dual citizenship candidates cannot be considered
• Minimum 7 years of experience supporting telephony systems in a systems administrator or engineer role
• Experience with Windows and Linux Server environments, including installation, patching, and troubleshooting
• Hands-on experience with enterprise telephony platforms, including Avaya systems
• Experience supporting call recording, workforce optimization (WFO), and workforce management (WFM) applications
• Strong experience with VMware environments, including:
  • ESXi and vCenter
  • System installation and upgrades
  • Troubleshooting
  • ESXi certificate management
• Networking experience, including:
  • IPv4 / IPv6
  • Ports and protocols
  • Network monitoring and troubleshooting
• Familiarity with security vulnerability remediation and validation in Windows and Linux environments
• Proficiency in managing and monitoring infrastructure, including telephony peripherals and server systems
• Working knowledge of client/server certificate management
• Experience administering Active Directory and Group Policy
• Ability to work onsite daily and within a commutable distance
• Willingness and ability to support 24x7x365 operations, including on-call rotation

Compensation:

• $75,000 - $92,000 *based on experience*
• PTO, Paid Holidays, Health, Dental, Vision, 401K, Sick Leave as required by Law

This job posting opens on 5/1/26 and will stay open for at least 30 days from the date of posting

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Keywords: install, configure, troubleshoot, Avaya, Voice Systems, Call Recording, Workforce Management, WFO, WFM, CMS, VMware, ESXi, vCenter, Windows Server, Linux Server, Active Directory, Group Policy, IIS, Network Troubleshooting, IPv4, IPv6, Certificates, Secret Clearance, Government Contract, On-Call Support, Enterprise Telephony, Call Center Infrastructure, windows system administrator, linux administrator, windows and linux, system administrator, troubleshooting, user access, AD, active directory, group policy, systems administrator, patching,