System Administrator III

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Full Time Dallas, TX, US

22 days ago Requisition

Job Summary:

• Working under limited supervision,the IT System Administrator III is a senior-level technical role responsible for managing, optimizing, and securing the organization’s infrastructure. This position provides advanced support, leads system implementations, and acts as an escalation point for complex issues across servers, networks, applications, and cloud environments.
• To perform this job successfully, an individual must be able to perform each essential duty satisfactorily. The requirements listed below are representative of the knowledge, skill, and/or ability required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

Responsibilities:

• Administer, maintain, and optimize Windows and/or Linux server environments
• Manage infrastructure services including Active Directory, DNS, DHCP, Group Policy, identity and access management, and directory synchronization
• Oversee enterprise storage, virtualization platforms (VMware/Hyper-V), and backup/DR solutions
• Implement and maintain security standards, patching, hardening, and monitoring across all systems
• Provide Tier III incident and problem resolution for escalated infrastructure issues
• Lead system upgrades, migrations, integrations, and infrastructure projects
• Manage cloud environments such as Microsoft 365, Azure, or AWS
• Develop and maintain technical documentation, diagrams, SOPs, and runbooks
• Collaborate with cross-functional teams including Networking, Security, Helpdesk, and Application Support
• Perform capacity planning and make recommendations for system improvements

Required

Education & Experience:

• 7+ years of hands-on experience as a system administrator or similar role, required
• Relevant certifications preferred (e.g., MCSA/MCSE, Azure Administrator, AWS Sys Ops, VMware VCP, CompTIA Security+)
• Ability to travel (20%)

Desired Proven Attributes:

• Advanced knowledge of Windows Server and/or Linux systems
• Strong experience with virtualization (VMware, Hyper-V)
• Familiarity with cloud platforms (Azure, AWS, Microsoft 365)
• Experience with Power Shell or similar automation/scripting tools
• Strong understanding of networking fundamentals (TCP/IP, routing, firewalls, VLANs)
• Experience with endpoint management platforms (Intune, SCCM, Jamf, etc.)
• Knowledge of security best practices, compliance standards, and threat mitigation
• Excellent troubleshooting, documentation, and communication skills
• Strong analytical and problem‑solving abilities
• Ability to work independently and lead technical initiatives
• Effective communication with both technical and non‑technical stakeholders
• High attention to detail and commitment to system reliability and security
• Collaboration, Trust & Engagement: Builds strong working relationships with Networking, Security, Helpdesk, and Application Support teams; communicates clearly during migrations, upgrades, and Tier III incidents so cross-functional partners stay informed; earns trust as the go-to escalation point for complex infrastructure issues.
• Customer Focus & Impact: Understands how server, identity, storage, and cloud reliability affect end users and business units; resolves Tier III incidents and problems in ways that minimize disruption and rebuild confidence in IT; delivers infrastructure projects and migrations that create lasting value rather than short‑term fixes.
• Results & Accountable: Takes ownership of enterprise infrastructure (AD, DNS, DHCP, GPO, storage, virtualization, backup/DR) with a bias toward action; drives patching,…