OT Network Engineer

RES

16h•Hybrid

About The Position

As RES continues to expand its portfolio of assets and services globally, there's an increasing need to adapt the management and operation of the systems and services that support Operational Technology (OT). To address this need, RES has established a global OT Team. We are seeking 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. This role is ideal for someone with a solid IT support background who is looking to deepen their networking expertise and grow into the OT space. The role is hybrid (split between office/home-location), with a strong focus on day-to-day support, ticket resolution, and configuration tasks. The successful candidate will also support the wider OT team with periodic onsite hardware deployments across the UK and Ireland, with the potential for occasional travel in Europe, so a willingness to travel as required is expected.

Requirements

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.
Familiarity with command-line tools (e.g., ipconfig, ping, tracert).
Basic understanding of secure access practices (e.g., strong passwords, physical security).
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 procedures accurately.
Demonstrates strong organizational skills and the ability to manage multiple tasks, tickets, and priorities independently and efficiently.
Passionate about technology and how it can improve business resilience.
Comfortable working in a hands-on capacity when required, including occasional onsite hardware installation work in line with site-specific safety protocols.
An individual of integrity who will respect and demonstrate RES values. Sensitive and intuitive, whilst displaying gravitas and credibility.
Valid driver's license and passport, with a willingness to travel as required.
Proven experience in a 2nd line IT support, network support, or similar role.
Hands-on experience troubleshooting and configuring network equipment (switches, firewalls, routers) in a production environment.
Solid IT foundation spanning Build and Run / Service Delivery, with a broad awareness of enterprise IT environments.
Experience working to SLAs within a ticket-driven support function.
Willingness to travel periodically across the UK and EMEA region to support deployments and onsite activities.

Nice To Haves

Exposure to OT environments (e.g., manufacturing, utilities, energy) is a plus, but not essential — a willingness to learn about OT systems and safety practices is required.
Previous experience in a field-based or deployment role is a plus.
Accreditation or certification relating to hardware and software, e.g. CompTIA A+.
Vendor qualifications or equivalent that show fundamental skills in networking technologies, e.g. CompTIA Network+.
Cisco CCNA, Fortinet NSE, or equivalent vendor networking certification is highly desirable.
ITIL Foundation or equivalent service management certification is desirable.

Responsibilities

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.