Junior System Administrator

SITEC Consulting is seeking motivated Junior and Mid-level Windows / Linux / VMware System Administrators to support a mission-focused government software hosting facility. This is an excellent opportunity for candidates who enjoy hands-on technical work across physical servers, virtual environments, operating systems, networking, security compliance, and customer support.

In this role, you will help deploy, maintain, secure, and troubleshoot critical infrastructure supporting a variety of customer missions. The ideal candidate is technically curious, comfortable working in a secure government environment, and eager to contribute to system reliability, security posture, and long-term infrastructure improvements.

As a System Administrator, you will support day-to-day operations, maintenance, and engineering activities across Windows, Linux, VMware, and related infrastructure. Responsibilities may include:

• Deploying and maintaining physical and virtual hardware infrastructure, including virtual machines and containers
• Performing routine maintenance, configuration changes, and troubleshooting across servers, workstations, and IT equipment
• Installing, configuring, and supporting hardware and software in a secure enterprise environment
• Managing system backups, disaster recovery planning, user accounts, and permissions
• Deploying, maintaining, and troubleshooting software applications
• Supporting customers by resolving technical issues and providing guidance on best practices
• Maintaining documentation, including knowledge base articles, incident response actions, system configurations, and administration procedures
• Securing information systems and applications in accordance with current DoD guidance
• Supporting RMF compliance activities, including scanning, STIG execution, remediation tracking, and routine security reporting
• Maintaining system configuration and security posture through continuous monitoring
• Participating in project planning and execution using Agile methodologies
• Providing networking support for on-premises infrastructure, including virtual networking environments

• Active Secret clearance with the ability to obtain a Top Secret clearance
• Ability to start with an interim Top Secret, if applicable
• U.S. Citizenship required
• 2-5 years of hands-on experience with the following:
  • Experience supporting Windows and/or Linux system administration
  • Experience with Risk Management Framework (RMF) compliance activities
  • Hands-on experience with security scanning, STIG execution, vulnerability remediation, or related security hardening activities
• CompTIA Security+ certification
• Windows or Linux operating system certification
• Familiarity with Linux operating systems and virtual networking concepts
• Strong troubleshooting, documentation, and customer support skills

• VMware / vSphere / ESXi administration
• Virtual networking
• System backups and disaster recovery
• Containers
• Active Directory
• Networking fundamentals and on-premises infrastructure support
• Experience working in secure DoD or government environments

This position offers the opportunity to work across a broad technical stack while supporting meaningful government missions. Candidates will gain exposure to infrastructure engineering, virtualization, cybersecurity compliance, RMF, STIGs, networking, and operational support in a collaborative environment.

Whether you are a junior administrator looking to grow or a senior-level professional ready to take ownership of complex systems, this role offers room to contribute, learn, and advance.

An active Secret clearance is required, with the ability to obtain a Top-Secret clearance
. Candidates must be U.S. Citizens.

Join SITEC Consulting and help support secure, reliable, mission-critical infrastructure for government customers.