Senior Systems Engineer

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

Job Details

Job Location: Greater St. Louis - O Fallon, MO 63368

Job Title: Senior Systems Engineer

Location: Greater St. Louis, MO

Start Date: Immediate

About Gateway:

Gateway Fiber is seeking an outstanding individual to fill the role of System Administrator 3. Gateway Fiber is a locally owned and operated internet service provider on a mission to positively impact communities through better internet. Gateway is creating a leading, national fiber-to-the-home platform. With the support of its financial sponsor CBRE Investment Management, Gateway plans to reach 500,000 homes and businesses with its service over the next several years. Gateway provides faster, more reliable internet with a simple pricing model and industry-leading customer service.

Gateway's Beliefs About People:

Gateway believes that people want to know they are cared for both professionally and personally at work. We all share a clear vision of where the company is going and how our contributions positively affect our culture and operational performance. At Gateway, we look out for each other and actively find ways to help one another. We all have a role in defining the path forward towards the company's vision. We strive for a transparent environment where information is readily shared, and our teams feel safe to share feedback, even if it might seem unpopular. Someone in the right role with the tools to succeed can operate autonomously to meet their objectives. Gateway's beliefs about people shape the company and the way we do business.

The Successful Candidate:

• A capable system and network administrator with practical experience supporting enterprise IT environments.
• A self-motivated problem solver who can identify issues, troubleshoot thoughtfully, and follow through to resolution.
• Someone who values reliable systems, clean handoffs, and documentation that helps the team work better.
• Comfortable working in a fast-moving environment where ownership, judgment, and teamwork matter.
• A teammate who jumps in to help, shares knowledge, and looks for practical ways to improve how work gets done.

What you'll do:

• 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.

What's in it for you?

• Meaningful infrastructure work that directly supports reliable internet service for the communities Gateway serves.
• Hands-on experience across Microsoft cloud, Azure, Windows Server, VMware, networking, security, and modern IT operations.
• A growing company where your work is visible, your judgment matters, and practical improvements can happen quickly.
• Opportunities to deepen your technical skills, take ownership of systems, and help shape how the IT team scales.
• A supportive team culture built around helping each other, sharing knowledge, and doing things the right way.
• Competitive salary and comprehensive benefits, including medical, dental, vision, paid time off, and a flexible work environment.

Qualifications

• Microsoft Azure or other cloud certification, or at least 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 security technologies such as 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.