Mid-Level 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.

What You'll Do

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

Required Qualifications

• 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
• 4-8 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

Desired 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

Why This Role

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.

Clearance Requirement

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

Apply Today

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