Windows​/Linux System Administrator Security Clearance

Position: Windows/Linux System Administrator with Security Clearance
* 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 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. 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 #LI-CB1 #LI-ONSITE ,