OT Network Engineer

We're the world's largest independent renewable energy company, guided by a simple yet powerful vision to create a future where everyone has access to affordable, zero‑carbon energy. To achieve our ambitions we need the best people to help us. RES is dedicated to the personal and professional growth of our employees, offering rewarding work that makes a real impact.

As RES expands its portfolio of assets and services globally, the need to adapt the management and operation of the systems that support Operational Technology (OT) has increased. The global OT Team seeks an experienced and detail‑oriented Network Engineer to provide 1st & 2nd line support across our OT estate, with primary responsibility for troubleshooting, configuring, and maintaining networking and IT infrastructure.

OT Network Engineer – hybrid (office/home‑location). The role focuses on day‑to‑day support, ticket resolution, configuration tasks, periodic onsite hardware deployments across the UK and Ireland, and occasional travel within Europe.

• Act as support for OT network and infrastructure issues, taking ownership of tickets through to resolution.
• Remote troubleshooting, support, and configuration of OT systems, network devices, and edge infrastructure.
• Investigate and resolve incidents involving switches, firewalls, routers, servers, and end‑user devices, escalating to 3rd line where appropriate.
• Configure and maintain network equipment in line with established standards (e.g., VLANs, basic routing, firewall rules, switch port configuration).
• Monitor network health and respond to alerts, proactively identifying and addressing issues before they impact operations.
• Work remotely with other OT team members and field engineers to provide remote hands support whilst troubleshooting complex network issues.
• Maintain accurate documentation, including network diagrams, configuration records, asset registers, and knowledge base articles.
• Support the rollout of OT hardware by following standard deployment procedures and documentation when required to attend site, ensuring consistent and secure installations.
• Travel to operational sites on an as‑needed basis to deploy or support OT hardware (e.g., switches, firewalls, edge devices).
• Liaise with site contacts, vendors, and internal teams to coordinate access, schedules, and support activities.
• Ensure compliance with health, safety, and security protocols both remotely and while on site.
• Team administration duties including coordination of support and deployment schedules, documentation management, and support for onboarding/offboarding processes.

• Strong grasp of networking fundamentals, with a confident understanding of IP addressing, subnetting, VLANs, and basic routing concepts.
• Working knowledge of switches, routers, firewalls, and servers, including common configuration tasks and troubleshooting techniques.
• Understanding of common network protocols (e.g., TCP/IP, DNS, DHCP, SNMP, SSH, HTTPS) and how to use them in diagnosing issues.
• Familiarity with firewall rule sets and basic network security principles.
• Solid navigation, administration, and troubleshooting in Windows (including Server editions); awareness of Active Directory concepts such as users, groups, and group policy.
• Confident with command‑line diagnostic tools (e.g., ipconfig/ifconfig, ping, tracert, nslookup, telnet).
• Experience working within a ticketing/ITSM system and following ITIL‑aligned incident, problem, and change management processes.
• Understanding of secure access practices (e.g., strong passwords, MFA, least‑privilege access, physical security).
• Familiarity with Ethernet cabling and physical network setup.
• Familiarity with cloud technology, especially Azure.

• Strong analytical and troubleshooting skills, able to work through technical problems logically and methodically.
• Calm under pressure and able to logically address and execute resolutions to operational incidents.
• Excellent written and verbal communication skills, able to explain technical issues clearly to both technical and non‑technical audiences.
• Strong attention to detail and ability to follow technical instructions and documented…