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Senior Network & OT Infrastructure Engineer
Location: Sheffield – 3 days per week onsite
Contract: Inside IR35
Duration: Initial contract, likely extension
Start: ASAP
We are looking for an experienced Senior Network & OT Infrastructure Engineer to design, automate, and support secure network environments across enterprise IT and operational technology (OT) estates. The role requires strong Cisco networking expertise alongside hands-on experience with SD-WAN, SD-Access, network automation, and industrial environments.
Key Responsibilities
- Design, configure, and support Cisco Catalyst switching environments using IOS-XE.
- Manage VLANs, STP/RSTP, port security, QoS, and Layer 2–7 troubleshooting.
- Configure and operate Cisco Catalyst SD-WAN, including policy templates, VPN segmentation, and WAN edge devices.
- Support Cisco SD-Access fabric design, commissioning, and ongoing operations.
- Use Cisco Catalyst Centre for device management, assurance, automation, and monitoring.
- Design secure IT/OT network segmentation based on the Purdue Model and IT/OT DMZ principles.
- Automate infrastructure provisioning and configuration using Terraform, Ansible, Python, or Bash.
- Integrate network changes into CI/CD pipelines using GitLab CI, GitHub Actions, Jenkins, or similar tools.
- Configure Cisco ISE for AAA, profiling, segmentation, and TrustSec.
- Support network automation through Cisco NSO, RESTCONF, and NETCONF interfaces.
- Troubleshoot complex performance, connectivity, and security issues across enterprise and industrial networks.
- Maintain technical documentation, network standards, and operational procedures.
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Essential Skills
- Strong Cisco Catalyst switching and IOS-XE experience.
- Excellent knowledge of VLANs, STP/RSTP, port security, QoS, and TCP/IP.
- Hands-on Cisco SD-WAN/Catalyst SD-WAN experience.
- Practical Cisco SD-Access and Catalyst Centre experience.
- Understanding of OT network architecture, the Purdue Model, and IT/OT DMZ design.
- Terraform experience for infrastructure provisioning.
- Python and/or Bash scripting for network automation.
- Experience with CI/CD tools such as GitLab CI, GitHub Actions, or Jenkins.
- Strong troubleshooting skills across Layers 2–7.
- Experience with Cisco ISE, including AAA, profiling, and TrustSec.
- Experience using Ansible or Terraform for network configuration management.
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Desirable Skills
- Cisco NSO, RESTCONF, or NETCONF experience.
- Knowledge of industrial protocols such as Modbus, DNP3, EtherNet/IP, PROFINET, IEC 61850, or OPC-UA.
- Experience with SCADA/ICS platforms such as Ignition, Wonderware, Siemens TIA Portal, or Rockwell FactoryTalk.
- Knowledge of IEC 62443, NIST SP 800-82, or NIS2 cybersecurity frameworks.
- Familiarity with enterprise and industrial network monitoring tools.
- Previous experience within manufacturing, utilities, energy, or other operational technology environments.
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