Network Engineer III

JMARK Business Solutions, Inc.•Tulsa, OK

10d•$80,000 - $115,000

About The Position

JMARK is hiring a Network Engineer III for its Tulsa team. The role primarily supports a large banking client and is responsible for maintaining, troubleshooting, securing, and improving complex network environments. The engineer works with JMARK engineers, technical teams, and client stakeholders to maintain network reliability, security, and performance. The position involves hands-on work with enterprise networking infrastructure, escalation of complex technical issues, participation in network projects, and support for business-critical systems. It also includes documentation, collaboration, knowledge sharing, mentoring, and professional client support.

Requirements

Approximately 3–5 years or more of relevant network engineering experience, or demonstrated equivalent technical expertise.
Advanced knowledge of enterprise networking technologies, including LAN, WAN, routing, switching, and network security.
Strong experience configuring and troubleshooting Cisco networking equipment or comparable enterprise networking technologies.
Experience with routing protocols such as OSPF, BGP, and EIGRP.
Advanced understanding of VLANs, STP, network segmentation, TCP/IP, subnetting, and IPv4/IPv6.
Experience implementing, administering, and troubleshooting firewalls, VPNs, and secure network connectivity.
Familiarity with Cisco ASA, Fortinet, or similar enterprise firewall platforms.
Experience using network monitoring and troubleshooting tools such as Wireshark, SSH, and other network management platforms.
Understanding of network security principles, access controls, intrusion prevention, and vulnerability mitigation.
Experience troubleshooting complex network issues in environments where uptime and reliability are critical.
Ability to document network configurations, technical solutions, and troubleshooting activities clearly and accurately.
Ability to communicate effectively with technical and nontechnical audiences, work independently and collaboratively, take ownership of problems, and follow through to resolution.
A proactive approach to improving systems and processes, continued learning, attention to detail, and delivering a strong client experience.

Nice To Haves

Experience supporting banking, financial services, or other highly regulated industries.
Experience supporting large, multisite enterprise networks.
Familiarity with Cisco Firepower, FMC/FTD, or other next-generation firewall technologies.
Experience working within a Managed Services Provider (MSP) environment.
Knowledge of network redundancy, disaster recovery, and business continuity planning.
Cisco certifications such as CCNA or CCNP, or equivalent industry certifications.
Experience with network monitoring, security logging, or intrusion prevention technologies.

Responsibilities

Configure, maintain, troubleshoot, and optimize enterprise network environments, including switches, routers, firewalls, VPNs, and other networking technologies.
Act as an escalation point for complex network issues, identify root causes, and implement long-term solutions to improve reliability and performance.
Support and maintain secure network infrastructure, including firewalls, intrusion prevention systems, secure remote access, and network security best practices.
Configure and troubleshoot VLANs, spanning tree, routing protocols, and network segmentation.
Monitor network health, identify potential issues proactively, and recommend improvements to performance, security, and availability.
Participate in network infrastructure upgrades, deployments, migrations, and other technology improvement projects from planning through implementation.
Maintain accurate technical documentation, communicate with internal teams and client stakeholders, and record service activities.
Share knowledge, mentor other engineers, and serve as a technical resource for challenging networking issues.
Provide professional, responsive support and translate technical challenges into practical solutions for business operations.
Help resolve high-priority incidents and participate in an assigned on-call rotation supporting business-critical systems.