OT Security SME

Queen Square Recruitment Ltd; Newcastle upon Tyne; Hybrid; GBP 79.000 - 87.000; Vollzeit

Zusammenfassung

Queen Square Recruitment Ltd is seeking an experienced OT Security SME to support a major cyber security programme in critical infrastructure. Focus areas include Encryption, HSM, PKI and certificate lifecycle management across OT/ICS environments.

You will bridge OT operations with engineering and cyber security stakeholders, ensuring secure deployment within live operations, with site visits and hybrid onsite/remote work.

Qualifikationen

• Weaknesses to mitigate in OT/ICS environments; must have strong OT security background.
• Experience with SCADA networks, control systems and industrial networks.
• Knowledge of PKI, cryptography, certificate management and key management solutions.
• Familiarity with IEC 62443, NCSC CAF and NERC CIP is preferred.

Aufgaben

• Provide SME guidance across OT/ICS environments including SCADA, DCS, RTUs, IEDs and HMIs.
• Support deployment and integration of HSMs within operational technology environments.
• Advise on PKI architecture and certificate issuance/renewal in OT contexts.
• Contribute to testing, validation and high-availability design for security solutions.
• Guide OT change management, maintenance windows and risk considerations.
• Participate in OT network segmentation and OT/IT boundary controls discussions.
• Collaborate with engineering, operations, cyber security and project teams.
• Assist with certificate lifecycle management and automation across large OT estates.
• Support site-based activities including control centres and field environments.

Kenntnisse

OT/ICS experience

SCADA networks

HSM deployments

PKI & cryptography

Certificate lifecycle management

Industrial protocols

DNP3

IEC61850

Modbus

Security architecture

Stakeholder mgmt

Tools

HSM tooling

PKI tooling

Network segmentation tooling

Jobbeschreibung

OT Security SME (Encryption, PKI & HSM) - Contract

Location: Newcastle - hybrid preferred (2-3 days per week onsite), however remote working will be considered with occasional site visits

Rate: £450 per day (Inside IR35) (may be negotiable DOE)

Start Date: ASAP

The Opportunity

We are seeking an experienced Operational Technology (OT) Security SME to support a large-scale cyber security programme within a critical infrastructure environment. This role will play a key part in the delivery of major Encryption, Hardware Security Module (HSM), PKI and Certificate Lifecycle Management (CLM) initiatives across complex OT and Industrial Control System (ICS) environments.

The successful consultant will act as the bridge between OT operations, engineering teams and cyber security stakeholders, ensuring security solutions are implemented safely and effectively within live operational environments.

Key Responsibilities

• Provide subject matter expertise across OT/ICS environments including SCADA, DCS, RTUs, IEDs and HMIs.
• Support the deployment and integration of Hardware Security Modules (HSMs) within operational technology and critical infrastructure environments.
• Advise on PKI architecture, certificate issuance, renewal and integration of HSM-backed cryptographic services.
• Contribute to proof-of-concept activities, testing, validation, high-availability design and failover planning.
• Provide guidance on OT change management processes, maintenance windows and operational risk considerations.
• Support security architecture discussions involving network segmentation, OT DMZ design and IT/OT boundary controls.
• Work closely with engineering, operations, cyber security and project delivery teams throughout the programme lifecycle.
• Assist with certificate lifecycle and automation requirements across large OT device estates.
• Participate in site-based activities where required, including control centre and field-based operational environments.

Required Skills & Experience

• Strong experience working within Operational Technology (OT) or Industrial Control System (ICS) environments.
• Hands-on knowledge of power, utilities, energy or other critical national infrastructure sectors.
• Experience with SCADA, control systems and industrial network architectures.
• Knowledge of industrial protocols such as DNP3, IEC 61850, Modbus and IEC 62351.
• Experience supporting or delivering HSM deployments within operational or highly regulated environments.
• Strong understanding of PKI, cryptography, certificate management and key management solutions.
• Familiarity with certificate lifecycle management (CLM) processes and tooling.
• Knowledge of network segmentation, security zones and OT security architecture principles.
• Understanding of regulatory and security frameworks such as IEC 62443, NCSC CAF and NERC CIP.
• Excellent stakeholder management and communication skills, with the ability to engage technical and non-technical audiences.
• Experience within electricity transmission, distribution, utilities or energy organisations.
• Exposure to substation environments and field engineering activities.
• Experience supporting OT laboratory environments, testing programmes or security proof-of-concepts.
• Knowledge of safety‑critical operational environments and associated governance processes.

If you are an experienced OT Security SME with expertise in HSM implementation, PKI, cryptography and critical infrastructure environments, we'd be keen to hear from you.