Senior IT Systems Engineer – Microsoft 365 & Infra

Tier4 Group; Atlanta (GA); Hybrid; USD 90,000 - 120,000; Full time

Job summary

Tier4 Group in the Atlanta metro area seeks a Senior Systems Engineer to enhance enterprise IT across Microsoft 365, identity management, endpoints, networking, and infrastructure. This hybrid role requires 3–4 days in the Marietta office as part of a collaborative IT team.

You will mentor teammates, resolve complex issues, and help drive a stable, secure, and scalable technology environment in partnership with IT, Security, and Infrastructure teams.

Qualifications

• 5+ years of progressive experience in IT engineering, systems administration, infrastructure support, or a related technical role.
• Strong experience supporting Microsoft-based enterprise environments.
• Hands-on experience with Microsoft 365 Administration, Active Directory and Entra ID, Intune and/or SCCM, Windows desktop and server administration, and enterprise networking fundamentals.

Responsibilities

• Serve as the senior escalation point for complex technical issues spanning endpoints, identity, infrastructure, networking, and enterprise applications.
• Perform root cause analysis and resolve issues that require advanced troubleshooting across Microsoft and enterprise technology platforms.
• Manage high-priority incidents and escalations while ensuring clear communication with stakeholders and end users.
• Administer and support Microsoft 365, Active Directory, and Entra ID environments, including identity, access, and authentication services.
• Support endpoint management platforms, including device provisioning, patch management, compliance enforcement, and configuration management.
• Troubleshoot connectivity issues involving LAN/WAN environments, VPNs, wireless networks, and remote users.
• Create and maintain technical documentation, knowledge articles, and runbooks to improve support effectiveness.
• Participate in on-call support rotations for critical business-impacting incidents.

Skills

IT engineering

Systems administration

Infrastructure support

Strong communication

Mentoring

Troubleshooting

Documentation

PowerShell scripting

Problem solving

Education

Microsoft Certifications

CompTIA Network+ or Security+

ITIL Foundations

Tools

Microsoft 365 Admin

Active Directory / Entra ID

Intune / SCCM

Windows Server Admin

LAN/WAN Networking

Job description

Tier4 Group in the Atlanta metro area seeks a Senior Systems Engineer to enhance enterprise IT across Microsoft 365, identity management, endpoints, networking, and infrastructure. This hybrid role requires 3–4 days in the Marietta office as part of a collaborative IT team.

You will mentor teammates, resolve complex issues, and help drive a stable, secure, and scalable technology environment in partnership with IT, Security, and Infrastructure teams.