Senior Security Architect - OT

Senior OT / CNI Security Architect

UK-based | Remote with client travel | Must be eligible for UK Gov Security Clearance

We're seeking a Senior OT Security Architect to join a fast-paced consulting engagement within a complex, high-impact technology environment.

The Senior OT / CNI Security Architect will help secure some of the most critical environments in the UK – from energy and utilities to transport, manufacturing and wider CNI clients.

You'll blend hands-on technical expertise and security architecture with a consulting mindset, acting as a trusted advisor to clients and shaping secure-by-design OT/ICS and hybrid IT/OT solutions.

What you'll do:

• Design and deliver OT / CNI security architectures for ICS/SCADA, industrial networks and hybrid IT/OT environments
• Produce key artefacts: threat models, risk assessments, high/low-level designs, security roadmaps
• Work with client engineering, ops and security teams in a trusted advisor capacity
• Lead or support cyber/OT security assessments and transformation projects
• Contribute to the development of our OT / CNI consulting offerings and collateral

What we're looking for

• Strong experience designing and implementing cybersecurity controls across OT and/or hybrid environments
• Experience cyber / information security consulting or auditing
• Good knowledge of frameworks such as IEC 62443, NIS/NIS2, NIST, ISO 27001, CIS, CAF, Cyber Essentials
• Comfortable engaging with both technical and non-technical stakeholders
• Adaptable, curious, and able to work across different sectors and technologies

Nice to have

• CISSP, CISM, CISA, SABSA, TOGAF, ISO 27001 Lead Auditor/Implementer
• Cloud (Azure / AWS) and/or IAM / PAM experience
• Background in OT, CNI or industrial environments

Why join our client:

• A genuinely flexible environment – work where and how you're most productive. The team comes together regularly for meetups and technical sessions that feel more like catching up with friends than formal meetings.
• A culture built on trust and respect – you'll find leaders who listen, colleagues who share knowledge freely in an autonomous environment.
• Genuine work-life balance – they know great work comes from happy people, not long hours.
• Continuous growth – ongoing training, certifications, and support to help you develop into senior architecture and advisory roles.
• Variety and impact – projects span OT, secure infrastructure, identity, network, and endpoint security across on-premises, cloud, and hybrid environments (Azure, AWS, M365).