System Administrator

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Please share resume

Job Role- Sr System Admin

Location: Chantilly, VA onsite hybrid 2 days per week

Duration- 6 Months+

Top 3 Must-Haves:

1. Strong experience with M365, Azure, Entra ID, and VMware (100% SaaS environment)
2. Solid networking experience, including firewalls and switching
3. CMMC experience — Palo Alto experience is a plus, as they are transitioning to it

Client is seeking an experienced Senior Systems Administrator to join our talented IT team. The Senior Systems Administrator serves as a technical leader within Client, responsible for designing, implementing, securing, and maintaining the organization’s server, network, and cloud infrastructure. This role provides expert-level support and hands-on administration across Windows servers, virtualization platforms, firewalls, switches, storage, and enterprise applications. The Senior Systems Administrator ensures the stability, performance, and security of mission-critical systems while driving infrastructure improvements, leading technical projects, and supporting strategic IT initiatives. This position requires deep technical expertise, strong problem-solving abilities, and the ability to collaborate effectively with IT leadership and cross-functional teams to support a high-performing, secure enterprise environment.

• Design, administer, and optimize Windows Server environments, virtualization platforms, storage systems, and core network components.

• Manage on-premises and cloud infrastructure—including virtual machines, identity services, backups, security configurations, and enterprise applications throughout their full lifecycle.

• Oversee firewalls, switches, wireless networks, and VPN systems to ensure secure and reliable connectivity across all Client locations.

• Lead patching, updates, monitoring, and performance tuning while providing Tier 3 escalation support for complex incidents and outages.

• Troubleshoot advanced system, network, and integration issues across both on-premises and cloud environments to minimize operational impact.

• Implement and enforce security best practices, including access controls, encryption, logging, monitoring, vulnerability remediation, and system hardening aligned with CMMC/NIST requirements.

• Conduct regular system health checks, security audits, and risk assessments, documenting findings and remediating gaps proactively.

• Develop scripts, automation tools, and streamlined workflows to improve operational efficiency and reduce manual effort.

• Create and maintain comprehensive documentation, including configurations, procedures, diagrams, policies, and system change records.

• Collaborate with IT leadership and external partners (vendors, MSPs, MSSPs) on strategic planning, solution evaluations, infrastructure modernization, and technical project implementations.

• Mentor junior administrators and support staff, providing technical guidance and knowledge transfer to elevate team capabilities.

Job Requirements

• Strong problem-solving abilities with the capability to resolve complex or conflicting technical situations.
• Familiarity with current CMMC requirements and general cybersecurity best practices.
• Excellent written and verbal communication skills, with the ability to collaborate effectively across teams.
• Self-motivated and able to work independently with minimal supervision.
• Strong proficiency with Windows Server administration and core infrastructure services.
• Hands-on experience with virtualization platforms such as VMware or Hyper-V.
• Solid understanding of networking concepts including TCP/IP, DNS, DHCP, VLANs, routing, and firewalls.
• Experience managing cloud environments (Azure or AWS), including identity, compute, and security configurations.
• Proficiency with scripting or automation tools (PowerShell, Bash, Python, etc.).
• Advanced troubleshooting and analytical skills across systems, networks, and cloud services.
• Must have authorization to work in the United States as defined by the Immigration Reform Act of 1986.
• Bachelor’s degree in Computer Science, Information Technology, or a related field preferred; equivalent experience will be considered.
• 5–7+ years of hands-on experience in systems administration or a related infrastructure-focused role.
• Microsoft Certified: Azure Administrator Associate (AZ-104)
• CompTIA Security+ (or higher-level security certification)
• Cisco CCNA or CCNP