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.

• 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 Power Edge 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.

• 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