Infrastructure Administrator

AAON, Inc.•Longview, TX

29d

About The Position

The Infrastructure Administrator III plays a critical role in the design, implementation, configuration, and support of the organization’s IT infrastructure, with a focus on network system and server systems. This role position requires advanced technical expertise, independent problem-solving, and active participation in infrastructure planning and project execution. This role supports the stability, performance, and security of network and server systems while collaborating with senior IT staff and leadership. Essential Responsibilities and Duties Design, configure, and maintain enterprise network infrastructure, including LAN, WLAN, WAN, firewalls, switches, and VPNs. Lead or co-lead infrastructure initiatives such as network redesigns, system migrations, and hardware upgrades. Monitor and analyze network performance, proactively identifying and resolving issues to ensure high availability and reliability. Implement and maintain network security measures, including firewall configurations, access controls, and patch management. Support and maintain Windows Server environments and VMware virtualization platforms. Administer core infrastructure services such as DNS, DHCP, and Active Directory. Develop and maintain detailed documentation for network configurations, procedures, and system architecture. Provide Tier III support for escalated technical issues, exercising independent judgment in troubleshooting and resolution. Collaborate with IT leadership on infrastructure planning and contribute to long-term technology strategies. Participate in a rotating on-call schedule and respond to critical incidents as needed.

Requirements

5+ years of progressive experience in network and systems administration in an enterprise IT environment.
Demonstrated experience with enterprise networking technologies and virtualization platforms.
Experience with network monitoring and diagnostic tools.
Bachelor’s degree in information technology, Computer Networking, or a related field; equivalent experience will be considered.
Advanced knowledge of network protocols and services (TCP/IP, VLANs, VPNs, DNS, DHCP).
Strong troubleshooting and diagnostic skills across networking, virtualization, and server systems.
Ability to work independently, prioritize tasks, and make decisions with minimal supervision.
Excellent communication and documentation skills, with the ability to convey technical information clearly.
Strong collaboration skills and the ability to contribute to cross-functional project teams.
Commitment to continuous learning and staying current with emerging technologies and best practices.
Must consistently embody the company’s core values – Demonstrate Great Moral Character, give your very best, empower team members, innovate and push boundaries, promote a safe, respectful environment.

Nice To Haves

Familiarity with cloud networking and hybrid infrastructure is a plus.
Industry certifications such as Cisco CCNA/CCNP, CompTIA Network+, or VMware VCP are preferred.

Responsibilities

Design, configure, and maintain enterprise network infrastructure, including LAN, WLAN, WAN, firewalls, switches, and VPNs.
Lead or co-lead infrastructure initiatives such as network redesigns, system migrations, and hardware upgrades.
Monitor and analyze network performance, proactively identifying and resolving issues to ensure high availability and reliability.
Implement and maintain network security measures, including firewall configurations, access controls, and patch management.
Support and maintain Windows Server environments and VMware virtualization platforms.
Administer core infrastructure services such as DNS, DHCP, and Active Directory.
Develop and maintain detailed documentation for network configurations, procedures, and system architecture.
Provide Tier III support for escalated technical issues, exercising independent judgment in troubleshooting and resolution.
Collaborate with IT leadership on infrastructure planning and contribute to long-term technology strategies.
Participate in a rotating on-call schedule and respond to critical incidents as needed.