Senior Systems & Microsoft 365 Administrator

Arnold Oil Company of Austin; Austin (TX); On-site; USD 85,000 - 110,000; Full time

Job summary

Arnold Oil Company of Austin seeks an experienced IT Systems Administrator to install, configure, and manage Windows client environments in a fast-paced office setting. You will handle AD, Group Policy, and Microsoft 365 administration while supporting VPN, network, and VoIP infrastructure.

The role requires strong hardware troubleshooting, end-user support, and meticulous documentation, with on-site duties in Austin, TX. A high school diploma is required; college degree preferred.

Qualifications

• Minimum 5 years of experience supporting Windows clients in a corporate environment.
• Deep knowledge of the Windows operating system, Active Directory, and Group Policy.
• Strong PC hardware expertise and ability to resolve complex hardware/software issues.
• Proven experience administering Microsoft 365 (Exchange Online, Teams, SharePoint, Intune, etc.).
• Experience with Microsoft 365 identity and security controls, including Entra ID, MFA, Conditional Access, and endpoint compliance.

Responsibilities

• Install, configure, upgrade, and troubleshoot hardware, software, and operating systems
• Manage routers, switches, firewalls, and VPN solutions (site-to-site and client-based)
• Provide Tier 2/3 support for end-user applications and remote laptop users
• Administer and support Microsoft 365, including Exchange Online, Teams, SharePoint, OneDrive, Intune and security/compliance features
• Maintain system and software license inventories
• Deploy, configure, and manage VoIP infrastructure
• Perform racking, installation, and cabling as needed
• Configure and troubleshoot wireless networks and related technologies
• Develop and maintain network documentation, topology diagrams, and SOPs
• Collaborate with security teams to ensure compliance with best practices for identity management, endpoint security, and data protection

Skills

Windows OS

TCP/IP Networking

Hardware Troubleshooting

End-user Support

Documentation

Education

High School Diploma or GED

College Degree Preferred

Tools

Active Directory

Group Policy

VPN Client

Exchange Online

Intune

Job description

Arnold Oil Company of Austin seeks an experienced IT Systems Administrator to install, configure, and manage Windows client environments in a fast-paced office setting. You will handle AD, Group Policy, and Microsoft 365 administration while supporting VPN, network, and VoIP infrastructure.

The role requires strong hardware troubleshooting, end-user support, and meticulous documentation, with on-site duties in Austin, TX. A high school diploma is required; college degree preferred.