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SIEM Engineer

United Kingdom, Hemel Hempstead 60000.00 - 65000.00 GBP / Year · Job Posted February 17, 2026
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Job Description

I'm looking for a hands-on SIEM Engineer to work on mission-critical Defence and National Intelligence systems. This is not a BAU SOC role. You’ll be owning SIEM capability end to end in some of the most secure environments in the UK. High trust, high autonomy technical role. Join a small number of engineers trusted with systems that genuinely matter. This is a great chance to use your SIEM skills in a highly secure defence environment.

Job Responsibility

  • Owning and optimising Splunk ES and/or Elastic Security
  • Building high-fidelity, MITRE ATT&CK-aligned detections
  • Designing and maintaining SIEM pipelines (CIM / ECS)
  • Automating detection and response using CI/CD, SOAR and IaC
  • Ensuring SIEM platforms are resilient, scalable and performant
  • Owning SIEM capability end to end
  • Work on classified, real-world threats not theoretical use cases
  • Influence platform design, detection strategy and automation

Requirements

  • Active UK DV clearance – essential
  • Proven, hands-on experience with Splunk ES and/or Elastic Security
  • Strong detection engineering background
  • Advanced SPL / KQL / EQL
  • Experience running SIEM at scale in high-security environments

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