Senior Network Engineer – Enterprise & Security

Jmark

Tulsa (OK)

On-site

USD 80,000 - 115,000

Full time

6 days ago

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Job summary

JMARK is seeking a Network Engineer III to join our Tulsa team. You will maintain, troubleshoot, secure, and improve complex network environments for a large banking client, working with a team of engineers to ensure reliability and performance.

Experience with enterprise networks and Cisco equipment is preferred. In this role you will own critical infrastructure, participate in on‑call rotations, and contribute to secure connectivity, advanced troubleshooting, and documentation of network

Qualifications

3–5 years or more of network engineering experience.
Advanced knowledge of enterprise networking: LAN, WAN, routing, switching, security.
Experience configuring/troubleshooting Cisco networking equipment or similar.
Experience with routing protocols (OSPF, BGP, EIGRP).
Understanding VLANs, STP, subnetting, IPv4/IPv6.

Responsibilities

Maintain, troubleshoot, secure, and improve complex network environments.
Serve as escalation point for complex network issues and implement long-term solutions.
Support and maintain secure network infrastructure including firewalls and VPNs.
Configure and troubleshoot VLANs, STP, routing, and segmentation.
Monitor network health and propose improvements for performance and reliability.
Lead projects from planning through implementation.
Document configurations and troubleshooting activities clearly.