OT/ICS Security Specialist | Contract | Ipswich (Hybrid) | 3 months | Inside IR35

n/a; Ipswich; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading technology firm is seeking an OT/ICS Security Specialist for a 3-month contract in Ipswich. The ideal candidate will have deep expertise in operational technology security, particularly with Fortinet products, and be able to work on-site 2 days a week. Responsibilities include leading OT security operations and responding to incidents. Candidates must be eligible to work inside IR35.

Qualifications

• Deep technical expertise across industrial control systems.
• Experience with compliance frameworks and Fortinet technologies.
• Ability to automate tasks and enhance workflows.

Responsibilities

• Lead and support OT security operations across various environments.
• Administer and engineer content for FortiSIEM.
• Develop and maintain monitoring use cases for OT assets.
• Detect and respond to OT security incidents.
• Implement controls for vulnerability and risk management.
• Communicate effectively with stakeholders.

Skills

OT security operations

Incident response

Python

Fortinet technologies

Tools

FortiSIEM

FortiGate

Job description

OT/ICS Security Specialist | Contract | Ipswich (Hybrid) | 3 months | Inside IR35

Duration: 3 months
Rate: £500/day (Inside IR35)
Location: Ipswich (2 days/week on-site)

I'm seeking a highly skilled OT/ICS Security Specialist to support a critical infrastructure client in strengthening their operational technology security posture. This is a hands‑on contract role ideal for someone with deep technical expertise across industrial control systems, compliance frameworks, and Fortinet technologies.

Key Responsibilities

• Lead and support OT security operations across SCADA, DCS, EMS, and field environments
• Administer and engineer content for FortiSIEM, integrating with Fortinet ecosystem (FortiGate, Analyzer, Manager)
• Develop and maintain monitoring use cases for OT assets (IEDs, HMIs, historians)
• Detect and respond to OT security incidents with low‑impact containment strategies
• Implement compensating controls for vulnerability and risk management in OT environments
• Automate tasks and enhance workflows using Python, APIs, and custom parsers
• Ensure compliance with NIS CAF or equivalent standards (IEC 62443, NERC CIP, ISO 27001, NIST)
• Communicate effectively with stakeholders, manage vendors, and uphold safety and change control processes

Technical Expertise

• ICS protocols and architectures: Purdue Model, IEC 61850, DNP3, Modbus, IEC 104
• Fortinet product suite and SIEM integration
• OT security tooling and architecture design

Certifications (Preferred)

• GICSP, IEC 62443, ISO Lead Auditor, CISSP, Fortinet NSE

Requirements

• Must be able to attend on‑site in Ipswich 2 days per week
• Eligible to work Inside IR35
• Available for a 3‑month engagement

If this is of interest then please apply with your most up‑to‑date CV and I'll give you a call if you look like a good fit.