Senior System Administrator – VMware, RMF, ACAS Expert

Si Tec Consulting; Lexington Park (MD); On-site; USD 75,000 - 140,000; Full time

Job summary

SITEC Consulting seeks System Administrators at Junior, Journey, and Senior levels to support a mission-focused government software hosting environment. The team will manage physical and virtual infrastructure, deploy servers and applications, and maintain secure configurations.

Ideal candidates have hands-on Windows/Linux administration, ACAS scanning experience, DISA STIGs, RMF compliance, and Active Directory expertise. U.S.

Qualifications

• Hands-on System Administration experience in Windows, Linux, or mixed operating-system environments.
• Experience with ACAS vulnerability scanning and credentialing.
• Experience implementing or maintaining DISA STIGs and supporting RMF compliance.
• Experience building, configuring, maintaining, or troubleshooting servers.
• Experience supporting virtualized infrastructure.
• Experience deploying and maintaining software applications.
• Working knowledge of networking and virtual networking concepts.
• Certifications: DoD 8570/8140 or Security+; OS certifications.
• U.S. Citizen with ability to obtain TS clearance.

Responsibilities

• Deploy, configure, administer, and maintain server infrastructure.
• Build and configure Windows and Linux servers for operational environments.
• Deploy and manage virtual machines using VMware, ESXi, and vSphere.
• Support virtual networking, storage, containers, and enterprise infrastructure technologies.
• Install, configure, deploy, maintain, and troubleshoot software applications.
• Perform system maintenance, patching, configuration changes, and vulnerability remediation.
• Conduct ACAS scanning, credentialed scans, vulnerability analysis, and remediation activities.
• Apply and maintain DISA STIGs and support RMF compliance requirements.
• Maintain the security and configuration posture of information systems through continuous monitoring and routine security activities.
• Configure and manage user accounts, permissions, groups, and access controls.
• Support Active Directory and related enterprise identity services.
• Maintain system backups and support disaster recovery and system restoration activities.
• Troubleshoot hardware, software, server, virtualization, networking, and application issues.
• Provide technical support and guidance to customers and internal teams.
• Maintain technical documentation, including system configurations, knowledge-base articles, incident response actions, and administrative procedures.
• Support networking requirements within on-premises infrastructure.
• Participate in technical planning and Agile project activities.

Skills

System administration

Windows admin

Linux admin

ACAS vulnerability scanning

DISA STIGs

RMF compliance

Active Directory

VMware

vSphere

ESXi

Networking basics

Credentialing

DoD 8570/8140

Secret clearance

U.S. Citizenship

Server builds & deployments

Application deployment

Tools

VMware

Nessus

ACAS

ESXi

vSphere

Windows Server

Red Hat Enterprise Linux

Active Directory

Job description

SITEC Consulting seeks System Administrators at Junior, Journey, and Senior levels to support a mission-focused government software hosting environment. The team will manage physical and virtual infrastructure, deploy servers and applications, and maintain secure configurations.

Ideal candidates have hands-on Windows/Linux administration, ACAS scanning experience, DISA STIGs, RMF compliance, and Active Directory expertise. U.S.