IT Support Engineer III - Level 3 Troubleshooter (Onsite)

Sterling Infrastructure, Inc.; The Woodlands (TX); On-site; USD 90,000 - 120,000; Full time

Job summary

Sterling Infrastructure, Inc. in The Woodlands, TX is seeking an experienced IT Support Engineer III to join our team as a true IT generalist.

You will act as the Level 3 escalation resource, troubleshoot complex issues across Windows, Microsoft 365, AD/Entra ID, networking, and security, and support endpoints via Intune/MDM. This is a full-time on-site role, requiring strong problem-solving skills and a readiness to wear multiple hats on office, field, and jobsite environments.

Qualifications

• 7+ years of progressive IT experience, including advanced Level 3 support or IT operations experience.
• Strong experience with Microsoft 365, Active Directory, Entra ID, Windows 11, Group Policy, Intune, MFA, and SSO.
• Solid networking knowledge including TCP/IP, DNS, DHCP, VLANs, VPNs, wireless, switches, routers, and firewalls.
• Strong troubleshooting skills with the ability to independently work through unusual or complex technical problems.
• Experience supporting multiple locations, remote users, or field operations.
• PowerShell/scripting experience preferred.
• Construction or field operations experience is a plus.

Responsibilities

• Serve as a Level 3 escalation point for complex technical issues and own problems through resolution.
• Troubleshoot Windows, Microsoft 365, Active Directory, Entra ID, hardware, software, identity/access, networking, VPNs, wireless, and business applications.
• Support and manage endpoints through Microsoft Intune/MDM.
• Monitor enterprise systems and respond to performance, availability, and technical issues.
• Assist with cybersecurity remediation, vulnerability findings, patching, and system hardening.
• Use PowerShell and automation to improve support and administrative processes.
• Provide technical guidance to Level 1 and Level 2 support staff.
• Support technology projects, office moves, equipment refreshes, system rollouts, and construction jobsites.

Skills

Microsoft 365

Active Directory

Entra ID

Windows 11

Group Policy

Intune

MFA

SSO

Networking

Troubleshooting

Tools

PowerShell

MDM

Windows Server

Job description

Sterling Infrastructure, Inc. in The Woodlands, TX is seeking an experienced IT Support Engineer III to join our team as a true IT generalist.

You will act as the Level 3 escalation resource, troubleshoot complex issues across Windows, Microsoft 365, AD/Entra ID, networking, and security, and support endpoints via Intune/MDM. This is a full-time on-site role, requiring strong problem-solving skills and a readiness to wear multiple hats on office, field, and jobsite environments.