Job Description
Sr. Network Security Engineer – Direct Hire/Local Field Support 4755 CHI Healthcare Infrastructure | Zero Trust | Multi‑Vendor | High‑Visibility Role Locations: Chicago – Remote-first with occasional onsite visits to local MSP clients Pay: $110-150K/year About the Role Tier4 is looking for a Senior Network Security Engineer who thrives in complex, multi‑vendor environments and loves turning chaotic networks into beautifully stable, secure architectures. If you enjoy solving real-world networking challenges, owning high‑impact projects, and representing engineering in executive‑level conversations, this role is for you. This position supports a rapidly growing healthcare‑focused technology organization, where uptime is everything and no two networks look the same. You’ll operate with autonomy, authority, and visibility — especially in Des Moines, home to the organization’s largest and most strategically important client. What You’ll Do Network Engineering & Security Leadership Architect, deploy, and support LAN/WAN and wireless networks across multi‑site healthcare environments (Ubiquiti, Meraki, Cambium, Aruba, Cisco, Ruckus). Configure and maintain next‑gen firewalls (Palo Alto, Fortinet, SonicWall, Meraki) across diverse environments. Lead Zero Trust initiatives, including: ZTNA Network Access Control (NAC) Micro‑segmentation VPN reduction & identity‑based access strategies Advanced Troubleshooting & Escalation Serve as Tier 3 escalation (approx. 70% of workload). Diagnose and resolve high-impact issues including spanning tree loops, routing anomalies, physical mispatch events, rogue devices, and wireless instability. Perform deep traffic analysis, packet captures, and threat analytics using NetFlow, Auvik, and firewall telemetry. Project Engineering Execute projects ranging from small firewall upgrades to large-scale deployments involving: 50–70 switches 400–500 access points Multiple redundant firewalls Support technology refreshes across newly onboarded communities with widely varying equipment and configurations. Client Interaction & Executive Presence Represent the Network Engineering function in high-visibility meetings, especially at the Des Moines corporate headquarters. Interface with IT Directors, CIOs, CTOs, and virtual IT leaders — requiring exceptional communication and professionalism. Partner with community-level leadership (Chicago) and internal NOC teams (Alpharetta) as needed. Documentation & Standards Maintain network baselines, configuration repositories, documentation, and disaster‑ready backups. Contribute to SIEM integrations and ongoing hardening of the security posture. Mentor L2/L3 engineers and help level up team capability.
