Freelance OT Security Engineer for Critical Infra (Hybrid)

Queen Square Recruitment; Gelderland; Hybrid; EUR 83,000 - 138,000; Part time

Job summary

Queen Square Recruitment seeks an OT Security Engineer on a freelance basis in Arnhem, Netherlands. The role focuses on securing industrial control systems within critical infrastructure, with a live OT security programme and NIS2 alignment.

You will assess, harden, and monitor OT security across SCADA/EMS environments, implement segmentation and privileged access controls, and work with control room engineers to bridge OT/IT security practices while maintaining safety.

Qualifications

• Hands-on OT/ICS security experience (not generic IT security).
• Knowledge of IEC 62443 and NIS2 requirements.
• Experience with OT network segmentation and privileged access management.
• Familiarity with SCADA/EMS platforms (Siemens Spectrum Power, GE PowerOn, Schneider ADMS or similar).
• Fluent English; Dutch a plus but not required.

Responsibilities

• Assess and harden security across OT environments (SCADA/EMS/DMS).
• Implement and maintain OT network segmentation and jump box architecture.
• Support NIS2 and IEC 62443 compliance activities, audits, and documentation.
• Monitor and respond to security incidents within isolated OT networks.
• Bridge OT/IT security practices with control room engineers and IT security teams.

Skills

OT/ICS security

IEC 62443 & NIS2

OT network segmentation

Privileged access management

SCADA/EMS familiarity

English proficiency

Tools

Session recording/monitoring tools

Job description

Queen Square Recruitment seeks an OT Security Engineer on a freelance basis in Arnhem, Netherlands. The role focuses on securing industrial control systems within critical infrastructure, with a live OT security programme and NIS2 alignment.

You will assess, harden, and monitor OT security across SCADA/EMS environments, implement segmentation and privileged access controls, and work with control room engineers to bridge OT/IT security practices while maintaining safety.