Senior OT Network Engineer Job Indianapolis Indiana USA,IT/Tech

Location: Indianapolis

Senior OT Network Engineer

Manufacturing

Our client, an established manufacturer, is hiring a Senior OT Network Engineer to architect, build, and support the robust industrial networking that underpins modern manufacturing operations. Working closely with Process/Automation Engineers, IT, and Information Security, you will provide high-impact technical leadership across plants and set the direction for secure, resilient OT network design. The role is on-site and requires roughly 10% travel.
In this role, you will:

Bridge the gap between IT and OT with high-impact technical leadership.
Build secure, resilient industrial networks that enable Industry 4.0.
Shape OT standards, architecture, and cyber-secure design practices.
Make a tangible impact on uptime, safety, and connectivity across plants.

Responsibilities

Design, configure, and deploy OT wired and wireless network infrastructure in production environments.
Maintain and optimize industrial network performance, uptime, and security.
Lead Tier 3 troubleshooting and root-cause analysis of OT network incidents.
Drive network architecture decisions, standards, and design blueprints.
Partner with engineering teams to integrate ICS, SCADA, PLCs, IIoT, and smart devices.
Implement and manage network segmentation and zoning aligned to the Purdue model.
Align OT security with corporate policies and frameworks (ISA/IEC 62443, NIST).
Manage and patch OT networking hardware (industrial switches, firewalls, routers).
Use monitoring and automation tooling such as Cisco Catalyst Center, Industrial Network Director, and Cyber Vision—or Fortinet equivalents.
Support network upgrades, migrations, and vendor coordination across plants.
Maintain accurate documentation of topologies, configurations, and operational procedures.
Enable digital-factory initiatives by securing edge device connectivity and infrastructure.

Required Qualifications

Bachelor's in Computer Science, Engineering, IT, or equivalent experience.
7+ years in network engineering, including senior or lead-level OT/industrial networking work.
Strong Cisco or Fortinet networking background, with a willingness to learn the other platform.
Working knowledge of the Purdue model as a foundational framework for OT architecture and segmentation.
Familiarity with PLCs and the automation equipment common to manufacturing environments.
Working knowledge of—or demonstrated ability to quickly learn—industrial protocols (OPC, Modbus, PROFINET, CIP, DNP3).
Strong OT security experience: segmentation, firewalls, and secure remote access.
Industrial wireless deployment and troubleshooting experience.
Experience working in a manufacturing environment.
Experience working in cross-functional teams across Operations, IT, and Security.
Experience with CMDB, change control, and network monitoring tools.
Excellent communication and documentation skills across technical and non-technical audiences.

Preferred Qualifications

Hands-on experience aligning OT environments to ISA/IEC 62443 and NIST frameworks.
Depth with a specific vendor stack—Cisco Industrial Ethernet, Firepower, Client, Catalyst Center, Cyber Vision; or Fortinet Forti Gate, Forti Switch, FortiNAC.
Advanced certification such as CCNP/CCIE, Fortinet NSE, or equivalent.