OT Network Engineer

Tata Consultancy Services Limited; Bengaluru, Pune District; On-site; INR 900,000 - 1,400,000; Full time

Job summary

Tata Consultancy Services Limited is seeking an OT Network Engineer in Bengaluru to operate and support OT LAN and connectivity across manufacturing sites. The role requires hands-on experience with industrial Ethernet switching, OT firewalls, and network segmentation to ensure health, security, and performance.

You will coordinate with security teams for vulnerabilities and changes, support 24x7 operations, and help roll out upgrades while maintaining thorough runbooks and documentation.

Qualifications

• Strong experience in OT / industrial network operations.
• Hands-on experience with industrial Ethernet switching.
• Experience with OT firewalls (mGuard preferred).
• Knowledge of network segmentation, IT/OT separation, and OT security zones.
• Solid understanding of TCP/IP, VLANs, routing, redundancy, NAT, ACLs, and related concepts.
• Experience with monitoring tools, incident/change management, and lifecycle.
• Knowledge of Purdue model and OT cybersecurity is desirable.
• Experience supporting manufacturing plants or industrial sites.
• Experience in high-availability, safety-critical environments.
• Strong troubleshooting and analytical skills; good coordination and documentation.

Responsibilities

• Operate and support OT LAN and connectivity services across manufacturing sites.
• Ensure network health, availability, and performance aligned with plant constraints and SLAs.
• Support centralized remote operations for OT environments.
• Manage industrial switching environments and plant connectivity.
• Configure, troubleshoot, and optimize switches, VLANs, segmentation, and redundancy.
• Support OT firewalls (e.g., mGuard) and implement firewall rules and secure paths.
• Align OT network changes with cybersecurity and plant security requirements.
• Coordinate with security teams on hardening, patching, and vulnerabilities.
• Monitor OT networks using approved tools; troubleshoot incidents especially when production is impacted.
• Participate in major incidents and maintain accurate ITSM updates.
• Execute planned OT network changes within approved processes and maintenance windows.
• Support upgrades, new site rollouts, and design changes; maintain baselines and rollback plans.
• Support secure OT remote access for internal teams and vendors with proper approvals.
• Manage OT IP addressing, subnet planning, and documentation; track EOL/EOS and coordinate upgrades.
• Coordinate with onsite teams, OEMs, and vendors for break-fix, RMA, and escalations.
• Maintain OT network documentation, diagrams, inventories, and runbooks; contribute to RCA and improvements.

Skills

OT / industrial network operations

Industrial Ethernet switching

OT firewalls (mGuard)

Network segmentation IT/OT separation

TCP/IP, VLANs, routing, NAT, ACLs

Monitoring tools & incident/change mgm

Purdue model & OT cybersecurity

Manufacturing plant support

High-availability & safety-critical

Troubleshooting & documentation

24x7 / on-call readiness

Tools

mGuard firewall

Job description

Job Title: OT Network Engineer

Key Responsibilities

• Operate and support OT LAN and connectivity services across manufacturing

sites.

• Ensure network health, availability, and performance aligned with plant

constraints and SLAs.

• Support centralized remote operations for OT environments.
• Manage industrial switching environments and plant connectivity.
• Configure, troubleshoot, and optimize switches, VLANs, segmentation, and

redundancy.

• Support industrial protocols such as PROFINET, Modbus, and EtherNet/IP.
• Support OT firewalls (e.g., mGuard or equivalent).
• Implement firewall rules, segmentation, NAT, and secure communication paths.
• Align OT network changes with cybersecurity and plant security requirements.
• Coordinate with security teams on hardening, patching, vulnerabilities, and

secure remote access.

• Monitor OT networks using approved tools.
• Troubleshoot and resolve incidents, especially production-impacting issues.
• Participate in major incidents and maintain accurate ITSM updates.
• Execute planned OT network changes within approved processes and

maintenance windows.

• Support upgrades, new site rollouts, and design changes.
• Maintain configurations, backups, baselines, and rollback plans.
• Support secure OT remote access for internal teams and approved vendors.
• Ensure access follows defined approvals, monitoring, and security controls.
• Manage OT IP addressing, subnet planning, and documentation.
• Support firmware upgrades, patching, and lifecycle management of OT devices.
• Track EOL/EOS risks and coordinate upgrades during plant shutdown windows.
• Coordinate with onsite teams, OEMs, and vendors for break-fix, RMA, and

escalations.

• Maintain OT network documentation, diagrams, inventories, and runbooks.
• Contribute to RCA and continuous improvement of OT network operations.

Required Skills & Experience

Technical Skills

• Strong experience in OT / industrial network operations
• Hands-on experience with industrial Ethernet switching
• Experience with OT firewalls (mGuard preferred)
• Knowledge of network segmentation, IT/OT separation, and OT security zones
• Solid understanding of TCP/IP, VLANs, routing, redundancy, NAT, ACLs, and

firewalls

• Experience with monitoring tools, incident/change management, and lifecycle

activities

• Knowledge of Purdue model and OT cybersecurity is desirable

Experience

• Experience supporting manufacturing plants or industrial sites
• Experience in high-availability, safety-critical environments

Soft Skills

• Strong troubleshooting and analytical skills
• Calm under production-impacting situations
• Good communication and coordination skills
• Strong documentation and change discipline
• Willingness to work in 24x7 or on-call support models if required

Preferred

• Experience in global manufacturing environments
• Exposure to OT cybersecurity, IT/OT convergence, or factory modernization