Windows / Linux / VMware Systems Administrator

About SITEC

SITEC is an employee and customer focused Information Technology and Professional Services Firm specializing in design, development, and delivery of state-of-the-art technology solutions, as well as cybersecurity, software and systems engineering services. SITEC provides support services as required for continuous operation of the Software Support Activity Software Production Facilities including complete lifecycle services for our customers platforms.

Mid-Level to Senior-Level

SITEC Consulting is seeking an experienced Windows / Linux / VMware Systems Administrator to support a government software hosting environment. This position provides systems engineering, administration, virtualization, cybersecurity, and infrastructure support for mission-critical information systems.

The ideal candidate will have hands-on experience administering Windows or Linux environments, maintaining VMware infrastructure, supporting Risk Management Framework compliance activities, and securing systems in accordance with Department of Defense requirements.

Responsibilities

• Design, implement, and maintain engineering solutions for complex and unique technical requirements within a government software hosting facility.
• Deploy, configure, administer, and maintain physical and virtual infrastructure, including servers, virtual machines, containers, workstations, and supporting IT equipment.
• Perform routine system maintenance, upgrades, patching, configuration changes, and performance optimization across Windows and Linux environments.
• Administer and troubleshoot VMware virtualization infrastructure and virtual networking environments.
• Diagnose and resolve hardware, operating system, software, networking, and application-related issues.
• Manage Active Directory user accounts, groups, permissions, authentication, and access controls.
• Deploy, configure, maintain, and troubleshoot enterprise software applications.
• Develop, maintain, and test system backup, restoration, continuity, and disaster recovery procedures.
• Secure information systems and applications in accordance with current Department of Defense cybersecurity guidance.
• Support Risk Management Framework compliance activities, including vulnerability scanning, Security Technical Implementation Guide implementation, remediation, evidence collection, and continuous monitoring.
• Maintain system configuration baselines and security posture through routine security reviews, event monitoring, reporting, and corrective actions.
• Provide networking support for on-premises infrastructure, including physical and virtual network components.
• Create and maintain technical documentation, including system configurations, architecture information, standard operating procedures, knowledge-base articles, incident response actions, and troubleshooting guides.
• Provide responsive technical support and guidance to customers, system owners, developers, and other technical stakeholders.
• Participate in Agile project planning, sprint activities, technical discussions, and infrastructure modernization initiatives.
• Mentor junior administrators and provide technical leadership, as appropriate for the candidate's experience level.

Required Qualifications

• Active Secret security clearance with the ability to obtain a Top Secret clearance. An interim Top Secret clearance may be required to begin work.
• Must be a U.S. Citizen.
• Mid-level candidates should possess approximately 5 or more years of relevant systems administration or infrastructure experience.
• Senior-level candidates should possess approximately 8 or more years of relevant systems administration or infrastructure experience.
• Demonstrated experience administering Windows Server or Linux operating systems in an enterprise environment.
• Experience supporting VMware virtualization technologies and virtual infrastructure.
• Hands-on Risk Management Framework compliance experience, including vulnerability scanning, STIG implementation, security remediation, and continuous monitoring.
• Experience installing, configuring, maintaining, and troubleshooting physical and virtual servers.
• Working knowledge of networking concepts, protocols, system backups, access controls, and information system security.
• Current CompTIA Security+ certification or another DoD 8140/8570-compliant certification appropriate for the position.
• Current Windows, Linux, VMware, or other relevant operating system certification.

Desired Qualifications

• Experience with VMware vSphere, ESXi, vCenter, or related virtualization technologies.
• Experience with Red Hat Enterprise Linux, Ubuntu, Windows Server, or mixed operating system environments.
• Experience with virtual networking, VLANs, DNS, DHCP, routing, switching, and firewall concepts.
• Experience administering Active Directory, Group Policy, user permissions, and identity management services.
• Experience deploying and managing containers using Docker, Kubernetes, Podman, or similar technologies.
• Experience with enterprise backup, restoration, replication, and disaster recovery solutions.
• Familiarity with ACAS, Nessus, SCAP, STIG Viewer, eMASS, or similar cybersecurity and compliance tools.
• Experience supporting classified or controlled government information systems.
• Familiarity with scripting or automation technologies such as PowerShell, Bash, Ansible, or Python.
• Experience working in Agile or DevSecOps environments.
• Strong technical documentation, troubleshooting, customer service, and communication skills.