Operational Technology Cyber Security Project Engineer

Bilfinger; Olney; On-site; GBP 46,000 - 76,000; Full time

Job summary

Bilfinger UK is seeking an experienced OT Cyber Security Systems Engineer to lead the technical delivery of OT network management and cybersecurity controls within industrial environments. The role focuses on designing, implementing and testing secure systems for PLC and SCADA networks, while maintaining safety and compliance.

You will produce technical documentation, collaborate with project teams, and mentor junior staff.

Qualifications

• Experience designing OT/ICS networks and cybersecurity solutions.
• Full lifecycle involvement from specification to testing.
• Experience configuring and testing security for OT/IACS environments.
• Hardening PLC, HMI and SCADA to industry standards.
• Securing network infrastructure with segmentation, firewalls and NIDS.
• Hands-on network design using Hirschmann managed switches and firewall products.
• Network time synchronization using dedicated appliances and NTP.
• Experience with Rockwell, Det-tronics, Opto 22 etc. vendor systems.
• Strong OSI/TCP-IP knowledge and industrial protocols like EtherNet/IP.
• QMS experience with traceable project outputs.

Responsibilities

• Deliver the OT network management system and cybersecurity controls for projects.
• Design, implement and test secure ICS networks.
• Produce, maintain and update design specs, test procedures and maintenance docs.
• Deploy and test PLC/SCADA networks and cybersecurity controls.
• Conduct system integration and FAT.
• Support lifecycle activities including vulnerability management and patching.
• Collaborate with engineering teams to plan and deliver cybersecurity work to schedule and quality.
• Report progress, risks and opportunities to project and commercial management.
• Provide health and safety leadership by example.

Skills

OT/ICS networks

Cybersecurity solutions

Project lifecycle

Hardening techniques

Network hardening

Hirschmann switches

Time synchronization

Vendor systems

OSI TCP/IP

QMS experience

Professional registration

Education

Engineering degree

Tools

Hirschmann switches

Rockwell Automation

Firewalls

NIDS

Job description

Salary: £46,000 - 76,000 per year

Requirements:

• Proven experience designing, implementing and testing OT/ICS networks and cybersecurity solutions in industrial environments.
• Detailed experience across the full project lifecycle, from system specification through design, development and testing.
• Experience designing, specifying, implementing, testing and commissioning security solutions, controls and countermeasures for OT/IACS environments.
• Experience hardening PLC, HMI and SCADA systems to recognised industry standards, guidelines and best practices.
• Experience securing and hardening network infrastructure, including segmentation and boundary protection using managed switches and firewalls, and passive Network Intrusion Detection Systems (NIDS).
• Hands-on experience designing and implementing networks using Hirschmann industrial managed switches and firewall products.
• Experience with network synchronisation, including dedicated time appliances and NTP.
• Experience implementing security controls and hardening automation vendor systems, such as Rockwell Automation, Bently Nevada, Det-tronics and Opto 22.
• Understanding of the OSI and TCP/IP models, with strong applied knowledge of industrial network protocols, including EtherNet/IP; CIP Security is beneficial.
• Strong troubleshooting, documentation and stakeholder communication skills.
• Experience working within a Quality Management System (QMS) and delivering well-described, traceable outputs throughout the project lifecycle.
• Degree or HND/HNC in Electronic/Electrical Engineering, Computer Science or another relevant engineering discipline.
• Professionally registered engineer or working towards professional registration.
• Experience in a System Integrator, Operator of Essential Services (OES) or Critical National Infrastructure (CNI) organisation is desirable.
• Familiarity with cybersecurity standards and frameworks relevant to OT is desirable.
• Experience mentoring junior staff, including apprentices, is desirable.
• Relevant OT cybersecurity certification is beneficial, such as ISA/IEC 62443 Cyber Security Expert, GIAC Global Industrial Cyber Security Professional (GISCP), CCNA or CCNP.

Responsibilities:

• Take responsibility for the technical delivery of the projects OT network management system and cybersecurity controls.
• Design, implement and test secure systems and networks for an industrial control system.
• Produce, maintain and update technical documentation, including design specifications, test procedures, and operating and maintenance documentation.
• Deploy and test networks and cybersecurity controls for PLC and SCADA environments.
• Conduct system integration and factory acceptance testing (FAT).
• Support OT cybersecurity project lifecycle activities, including vulnerability identification, patching, and software and password management.
• Collaborate with the Project Engineering Management team, Lead Automation Engineers, OT Cyber Security Manager and wider project engineering team to plan and deliver project cybersecurity work to the required schedule and quality standards.
• Report progress and blockers clearly and support the Project Manager with commercial matters, including progress, risks, issues and opportunities.
• Support the project and commercial management team with technical aspects of subcontracts.
• Provide health and safety leadership by example.

Technologies:

• Ethernet
• Firewall
• Support
• Network
• PLC
• Project Manager
• Security
• TCP/IP

More:

We are Bilfinger UK, an engineering and maintenance provider supporting customers across chemical and petrochemical, nuclear, oil and gas, pharmaceutical and biopharma, power and energy, utilities, renewables, and food and beverage markets. We help improve asset efficiency, availability and maintenance costs, drawing on experience across offshore and onshore facilities and the full asset lifecycle. Our workforce of more than 4,500 employees operates from 14 offices in strategic industrial hubs, with a focus on safety, compliance and quality. We are seeking an experienced and enthusiastic OT Cyber Security Systems Engineer to join our Automation team in a project-based contract role. The role focuses on securing OT systems and networks while maintaining availability, safety and compliance with industry and client standards, and involves working in a complex, multidisciplinary project environment.

last updated 40 week of 2026