Senior Infrastructure Engineer: Cloud, Networking & Identity Leader

Tier4 Group; Dallas (TX); On-site; USD 110,000 - 165,000; Full time

Job summary

Tier4 Group is seeking a Senior Infrastructure Engineer to design, deliver, and support enterprise infrastructure across on‑premises, cloud, data center, and branch environments. The role acts as a senior technical lead across Microsoft identity, networking, virtualization, and core services, ensuring systems are current, resilient, and aligned with company standards.

You will collaborate with IT teams, mentor colleagues, publish authoritative documentation, drive security controls, plan

Qualifications

• Bachelor's degree in Computer Science, Information Technology, or related field, or equivalent experience.

Responsibilities

• Lead the architecture, selection, implementation, lifecycle management, optimization, and support of enterprise infrastructure solutions.

Skills

TCP/IP knowledge

OSI model

Routing & switching

BGP/OSPF

VPNs & firewalls

Microsoft 365 administration

Windows Server

VMware vSphere/ESXi

Azure/AWS

PowerShell

DSC / automation

SharePoint knowledge base

Education

Bachelor's degree in Computer Science or related field

CCNA/CCNP, Cisco Meraki, Microsoft, Azure, VMware certifications

ITIL or related framework

Tools

Cisco Meraki

PowerShell

SharePoint knowledge base

Microsoft Visio

SQL Server

EDI platforms (OpenText, Cleo LexiCom)

Job description

Tier4 Group is seeking a Senior Infrastructure Engineer to design, deliver, and support enterprise infrastructure across on‑premises, cloud, data center, and branch environments. The role acts as a senior technical lead across Microsoft identity, networking, virtualization, and core services, ensuring systems are current, resilient, and aligned with company standards.

You will collaborate with IT teams, mentor colleagues, publish authoritative documentation, drive security controls, plan