Senior Systems Engineer — Cloud, Security & Automation

Gateway Fiber; O’Fallon (MO); On-site; USD 95,000 - 125,000; Full time

Benefits offered by this job

Competitive salary

Medical insurance

Dental insurance

Vision insurance

Paid time off

Flexible work environment

Job summary

Gateway Fiber is seeking a Senior Systems Engineer to administer and optimize our Microsoft cloud environment and on‑premises infrastructure. You will manage Entra ID, Exchange, SharePoint, Intune, Security Center, and Azure resources, while maintaining Windows Server and VMware environments.

The role emphasizes security, automation, and reliable, well‑documented operations. You will collaborate across IT to implement best practices, scale processes, and respond quickly to incidents in a

Qualifications

• 5+ years of experience in physical and cloud network and server administration.
• Experience administering Microsoft cloud services including Entra ID, Exchange, SharePoint, Intune, and Security Center.
• Experience supporting Microsoft Azure virtual machines, networking, and storage.
• Practical knowledge of computer systems, security, network administration, databases, and data storage systems.
• Experience with RMM tools such as NinjaOne, Atera, or Intune.
• VMware ESXi and vCenter administration experience is a plus.
• Experience administering and troubleshooting Cisco Meraki, Arctic Wolf, firewalls, endpoint protection, vulnerability management, and security monitoring platforms.
• Understanding of security best practices, including network segmentation, access control, threat detection, incident response, and secure configuration management.

Responsibilities

• Administer and support Gateway's Microsoft cloud environment, including Entra ID, Exchange, SharePoint, Intune, and Security Center.
• Support Azure virtual machines, networking, and storage resources through routine configuration, monitoring, and troubleshooting.
• Help build processes, automation, and tooling to allow Gateway to simplify and scale.
• Maintain Windows Server and VMware environments to help keep systems reliable, secure, and well documented.
• Monitor systems, respond to alerts and tickets, and resolve infrastructure and end-user issues with urgency and follow-through.
• Apply security, access, and operational best practices across systems, applications, networks, and data storage platforms.
• Contribute to technical projects, process improvements, and documentation that help the IT team operate consistently and effectively.
• Configure, monitor, and maintain security platforms including Cisco Meraki and Arctic Wolf to support a secure, reliable, and compliant enterprise environment.
• Assist with security incident response, threat monitoring, vulnerability remediation, and network hardening efforts across cloud, server, and network infrastructure.

Skills

Network administration

Security best practices

Incident response

Education

Cloud certification or equivalent experience

Tools

Entra ID

Exchange

SharePoint

Intune

Security Center

Azure VMs

Azure Networking

Azure Storage

NinjaOne

Atera

Cisco Meraki

Arctic Wolf

VMware ESXi

VMware vCenter

Firewalls

Endpoint protection

Vulnerability management

Security monitoring platforms

Job description

Gateway Fiber is seeking a Senior Systems Engineer to administer and optimize our Microsoft cloud environment and on‑premises infrastructure. You will manage Entra ID, Exchange, SharePoint, Intune, Security Center, and Azure resources, while maintaining Windows Server and VMware environments.

The role emphasizes security, automation, and reliable, well‑documented operations. You will collaborate across IT to implement best practices, scale processes, and respond quickly to incidents in a