Senior OT Security Architect for Critical Infrastructure

Digital Waffle; Leicester; On-site; GBP 45,000 - 75,000; Full time

Benefits offered by this job

Bonus

Pension plan

Job summary

Digital Waffle in Leicester is seeking a Senior OT Security Engineer to strengthen secure-by-design practices across critical energy infrastructure projects.

You will guide engineering and service teams, design secure OT architectures, and lead FAT/SAT activities, while mentoring colleagues. The role requires credentials and hands-on ICS/OT experience, with emphasis on NIS2 and IEC standards for resilient networks.

Qualifications

• Certification completed or underway (CISSP or IEC 62443).
• Experience in OT/ICS environments.
• Familiarity with IEC 62443 and IEC 62351.
• Understanding of substation automation and IEC 61850.
• Knowledge of NIS2 regulatory expectations.
• Experience with security technologies (firewalls, IDS, VPNs, encryption).

Responsibilities

• Provide expert cybersecurity guidance across engineering, development and service delivery, ensuring secure-by-design solutions.
• Design and implement robust security architectures for software and hardware components.
• Develop and maintain cybersecurity frameworks aligned with IEC 62443 and IEC 62351.
• Identify and implement improvements to cybersecurity processes and mitigations.
• Produce and oversee FAT and SAT documentation, leading security validation activities.
• Mentor project teams throughout full lifecycle with security expertise.
• Deliver internal training sessions to raise cybersecurity capability.
• Track, assess and communicate security risks and mitigation plans to stakeholders.
• Ensure adherence to corporate policies and handling of sensitive information.

Skills

OT Security

ICS/OT environments

Security architectures

Communication

Training delivery

Education

CISSP or IEC 62443 credentials (certified or in progress)

Tools

Firewalls

IDS/IPS

VPNs

Encryption

Job description

Digital Waffle in Leicester is seeking a Senior OT Security Engineer to strengthen secure-by-design practices across critical energy infrastructure projects.

You will guide engineering and service teams, design secure OT architectures, and lead FAT/SAT activities, while mentoring colleagues. The role requires credentials and hands-on ICS/OT experience, with emphasis on NIS2 and IEC standards for resilient networks.