Senior IT Infrastructure & Security Engineer

SSR Total IT; Milwaukee (WI); On-site; USD 90,000 - 130,000; Full time

Job summary

SSR Total IT is seeking an experienced IT Engineer to act as a trusted technical advisor and technical leader within our Infrastructure & Security Engineering team. You will own client environments, lead infrastructure projects, and ensure the long-term health of networks, servers, cloud platforms, and security systems for a diverse set of Wisconsin-based clients.

You will collaborate with a group of 10+ engineers, focusing on complex troubleshooting, strategic infrastructure initiatives, and

Qualifications

• 8+ years supporting IT infrastructure environments.
• Strong Windows Server / Active Directory experience.
• Networking fundamentals (VLANs, VPNs, firewalls, switching).
• Microsoft 365 / Azure experience.
• VMware or Hyper‑V experience.
• Strong troubleshooting and client communication skills.
• Hardware platforms including HP, Dell, Meraki, and Cisco.
• Preferred MSP or consulting experience.
• Veeam / Datto / backup platforms.
• Security tools (Sentinel One, KnowBe4, Duo, Qualys, Greenbone, etc.).
• Certifications (Microsoft, Azure, VMware, Cisco, Security+, etc.).

Responsibilities

• Act as the technical leader for assigned client environments.
• Design, implement, and maintain servers, security, networking, firewalls, backups, and cloud platforms.
• Support and architect Microsoft 365 and Azure environments.
• Lead migrations, upgrades, virtualization, and infrastructure projects.
• Assist Help Desk and NOC teams with escalations.
• Perform proactive system reviews and recommend improvements.
• Keep building your skills and certifications to stay ahead of what the market needs.

Skills

Windows Server experience

Active Directory experience

Networking fundamentals

Microsoft 365 / Azure experience

VMware / Hyper-V experience

Troubleshooting

Client communication

Hardware knowledge (HP, Dell, Meraki,,

Tools

VMware

Hyper-V

Azure

Meraki

Cisco

VPNs

Firewalls

Job description

SSR Total IT is seeking an experienced IT Engineer to act as a trusted technical advisor and technical leader within our Infrastructure & Security Engineering team. You will own client environments, lead infrastructure projects, and ensure the long-term health of networks, servers, cloud platforms, and security systems for a diverse set of Wisconsin-based clients.

You will collaborate with a group of 10+ engineers, focusing on complex troubleshooting, strategic infrastructure initiatives, and