Sr. OT Network Engineer (Princeton, IN)

Gtatelecom; Princeton (IN); On-site; USD 140,000 - 180,000; Full time

Job summary

Gtatelecom in Indiana is seeking a Senior OT Network Engineer to design, deploy, and secure OT networks across industrial environments. You will lead Cisco SD-Access implementation, enforce IDMZ and microsegmentation, and collaborate with IT and plant teams to deliver reliable plant-floor operations.

The role requires deep routing/switching, OT security experience in manufacturing, and strong communication with stakeholders.

Qualifications

• 10+ years of progressive network engineering experience, or equivalent practical experience.
• Hands-on experience with routing, switching, LAN/WAN, and high-availability network environments.
• Experience designing or securing OT networks in manufacturing, industrial, or plant-floor settings.
• Knowledge of network segmentation, zero-trust principles, and industrial DMZ (IDMZ) design.
• Strong communication, problem-solving, and stakeholder collaboration skills.
• Bachelor’s degree in a STEM field or equivalent experience.

Responsibilities

• Deploy, modernize, and manage OT network infrastructure across industrial environments.
• Design secure network architectures using IDMZ, macro-segmentation, and microsegmentation across Purdue Model layers.
• Implement Cisco SD-Access to support fabric automation and identity-based access control.
• Troubleshoot complex network incidents and coordinate upgrades, cutovers, and maintenance activities.
• Partner with IT and plant teams to translate operational needs into secure network solutions.
• Mentor local technical teams on OT networking and security fundamentals.

Skills

Routing & Switching

LAN/WAN

High-availability networks

OT networks

Industrial DMZ (IDMZ) design

Network segmentation

Zero-trust principles

Cisco SD-Access

DNA Center/Catalyst Center

Cisco ISE

CCNP/CCIE/CISSP/GICSP

Communication & collaboration

Education

Bachelor’s degree in STEM

Tools

Cisco SD-Access

Cisco ISE

Job description

Design and strengthen the networks that keep industrial and manufacturing environments connected and secure. As a Senior OT Network Engineer, you’ll deliver and maintain operational technology infrastructure, apply network segmentation and zero-trust principles, and help ensure resilient plant-floor operations.

This is a hands‑on technical leadership role for an engineer who can work across IT and plant teams. You’ll shape secure OT network architectures, lead Cisco SD-Access implementation, troubleshoot complex issues, and help other technical teams build confidence in OT networking and security.

Required Skills & Experience

• 10+ years of progressive network engineering experience, or equivalent practical experience.
• Hands‑on experience with routing, switching, LAN/WAN, and high-availability network environments.
• Experience designing or securing OT networks in manufacturing, industrial, or plant‑floor settings.
• Knowledge of network segmentation, zero‑trust principles, and industrial DMZ (IDMZ) design.
• Strong communication, problem‑solving, and stakeholder collaboration skills.
• Bachelor’s degree in a STEM field or equivalent experience.

Desired Skills & Experience

• Experience implementing Cisco SD‑Access (SDA), DNA Center/Catalyst Center, and Cisco ISE.
• Familiarity with microsegmentation, identity-based access policies, or software‑defined firewalls.
• Experience with industrial wireless, next‑generation firewalls, or high‑availability design.
• Familiarity with industrial protocols such as EtherNet/IP or Modbus.
• Active certifications such as CCNP, CCIE, CISSP, or GICSP.

What You Will Be Doing

• Deploy, modernize, and manage OT network infrastructure across industrial environments.
• Design secure network architectures using IDMZ, macro‑segmentation, and microsegmentation across Purdue Model layers.
• Implement Cisco SD‑Access to support fabric automation and identity‑based access control.
• Troubleshoot complex network incidents and coordinate upgrades, cutovers, and maintenance activities.
• Partner with IT and plant teams to translate operational needs into secure network solutions.
• Mentor local technical teams on OT networking and security fundamentals.

Tech Breakdown

Approximate focus areas; workload may vary by project and operational needs.

• OT network architecture and infrastructure lifecycle — 25%
• Cisco SD‑Access and fabric implementation — 20%
• Network segmentation and OT security — 20%
• Troubleshooting and escalation support — 15%
• Upgrades, cutovers, and maintenance — 10%
• Collaboration and technical mentorship — 10%