IT Technician Tier 3 – Senior Systems & Network Engineer

American Freedom Insurance•Mount Prospect, IL

1d•Onsite

About The Position

The onsite Tier 3 Senior Systems & Network Engineer is the IT department’s highest level of technical escalation. The role maintains the reliability, performance, and security of existing infrastructure while engineering new solutions to support business growth and modernization. It handles complex issues unresolved by Tier 1 or Tier 2 support and owns the organization’s network environment alongside Windows Server, Microsoft Azure, Intune, infrastructure monitoring platforms, virtualization, and line-of-business application maintenance.

Requirements

Bachelor’s degree in Information Technology, Computer Science, or a related field preferred.
At least 5 years of experience in IT infrastructure, systems administration, or network engineering.
Strong experience with Windows Server 2016, 2019, or 2022 environments.
Advanced knowledge of Active Directory, DNS, DHCP, and Group Policy.
Required strong networking experience with switches, routers, VLANs, VPNs, and firewalls.
Experience troubleshooting server and network infrastructure issues.
Experience with Hyper-V or VMware virtualization.
Required hands-on experience with Microsoft Azure and hybrid cloud environments.
Required proficiency with endpoint management tools, specifically Microsoft Intune.
Experience with infrastructure monitoring platforms such as Zabbix, or demonstrated ability and willingness to learn.
Experience supporting and maintaining line-of-business applications, including patching and vendor coordination.
Strong problem-solving and analytical skills.
Ability to mentor and support Tier 1 and Tier 2 technicians.

Nice To Haves

Certifications such as CCNA, Microsoft Azure or Intune certifications, or equivalent.
Experience with infrastructure monitoring platforms such as Zabbix.

Responsibilities

Act as the highest escalation point for infrastructure, system, and network issues.
Maintain, support, and continuously improve existing server, network, and endpoint infrastructure.
Engineer and deploy infrastructure solutions from design through implementation, aligned with business growth and modernization goals.
Own and evolve network infrastructure, including firewalls, routers, switches, VLANs, and VPNs; maintain existing environments and design improvements.
Troubleshoot and resolve complex issues across servers, endpoints, and network systems.
Manage and maintain Windows Server environments and Active Directory infrastructure.
Monitor system and network performance using platforms such as Zabbix, and deploy and manage monitoring and alerting solutions.
Own and administer Microsoft Azure and hybrid cloud environments.
Deploy, manage, and maintain endpoint environments using Microsoft Intune.
Support and maintain line-of-business applications, including patching, updates, and vendor coordination.
Support virtualization environments and ensure system availability and performance.
Assist with infrastructure projects, including migrations, deployments, and integrations.
Provide technical guidance and escalation support to Tier 1 and Tier 2 teams.
Maintain technical documentation, network diagrams, and system procedures.
Ensure security best practices, patch management, and system hardening standards are followed.
Evaluate and recommend technologies to improve infrastructure efficiency and reliability.

Benefits

401(k) with up to a 6% company match.
Choice of Blue Cross Blue Shield PPO, HMO, or HSA health plans.
Dental and vision coverage.
Access to telemedicine services.
At least 6 paid holidays.
Paid time off usable for vacation, personal, or sick time.
Separate personal days for sickness, family needs, appointments, or personal matters.
Paid training.
State licensing reimbursement.
Opportunities for advancement.
Employee referral bonuses.
Employee recognition of work milestones.