Senior Threat Hunter - Nuclear Cyber Defense Lead

Sellafield; England; On-site; GBP 65,000 - 90,000; Full time

Benefits offered by this job

Annual bonus up to 10–15%

Pension scheme

30 days annual leave + bank holidays

Cycle to Work

Job summary

Sellafield Ltd in the UK is seeking a Senior Threat Hunter to lead proactive threat hunting across IT and OT within a regulated nuclear environment. You will develop methodologies, mentor junior staff, and drive automation while ensuring compliance with GDPR, NIS, and CAF standards.

You will collaborate across CS&IA, HR and site stakeholders to strengthen detection capabilities, deliver actionable remediation guidance, and support incident response with threat context and technical analysis.

Qualifications

• Extensive experience in threat hunting, SOC operations, or cyber forensics.
• Knowledge of adversary TTPs and MITRE ATT&CK.
• Familiarity with SIEM platforms and threat intelligence integration.
• Scripting skills (Python, PowerShell, REGEX) to support hunting and automation.

Responsibilities

• Develop and maintain structured threat hunting methodologies and playbooks to ensure repeatable, high‑quality hunting activities.
• Execute threat hunting activities to identify indicators of compromise and emerging attack techniques.
• Identify telemetry gaps and work with the SOC engineering team to improve data visibility and detection logic across IT and OT environments.
• Adapt hunting methodologies for OT environments, considering unique constraints such as limited telemetry, legacy systems, and operational safety requirements.
• Analyse threat intelligence and correlate findings with internal telemetry to detect potential risks.
• Develop and refine/test hunting hypotheses based on adversary TTPs and frameworks such as MITRE ATT&CK.
• Produce clear, actionable reports and recommendations for remediation and risk reduction.
• Assist incident response by providing technical analysis and threat context during investigations.
• Drive/Contribute to automation and scripting initiatives to streamline hunting workflows.
• Maintain awareness of threat actor behaviours, tools, and emerging vulnerabilities.
• Support/mentor capability development within the Threat team through knowledge sharing and best practices.
• Ensure adherence to data protection, confidentiality, and security standards in all threat hunting activities.

Skills

Threat hunting

SOC operations

Cyber forensics

MITRE ATT&CK

SIEM

Python

PowerShell

Regex

Analytical thinking

Communication

Regulatory knowledge

Education

Degree in Cyber Security or Computer Science

GIAC GDAT/GCFA/GCIA certifications

Tools

SIEM platforms

Threat intelligence integration

Job description

Sellafield Ltd in the UK is seeking a Senior Threat Hunter to lead proactive threat hunting across IT and OT within a regulated nuclear environment. You will develop methodologies, mentor junior staff, and drive automation while ensuring compliance with GDPR, NIS, and CAF standards.

You will collaborate across CS&IA, HR and site stakeholders to strengthen detection capabilities, deliver actionable remediation guidance, and support incident response with threat context and technical analysis.