Detection Engineer

Detection Engineer (SOC / SIEM / Splunk) £450 per day | Outside IR35 | 9-Month Contract Active SC Clearance Required London (1 day per month onsite) A leading consultancy is looking for a Detection Engineer to join a high-profile cyber security programme supporting critical public sector services.

This role offers a unique blend of detection engineering and SOC operations , providing the opportunity to develop and optimise advanced detection capabilities while helping protect large-scale cloud environments. Working within a Security Operations Centre (SOC), you'll be responsible for building and tuning detections, investigating security incidents, and improving the effectiveness of security monitoring across AWS and Splunk environments.

The Role As a Detection Engineer, you will operate at the intersection of security operations, threat detection, and cloud security. You'll work closely with SOC analysts, engineers, and stakeholders to develop high-fidelity detections, reduce false positives, and strengthen overall security visibility. This is an excellent opportunity for someone with Splunk and AWS security monitoring experience who enjoys both hands-on threat analysis and detection development.

Key Responsibilities Detection Engineering Develop, test, and optimise Splunk SPL correlation searches and alerting logic. Create and maintain detection use cases aligned to attacker tactics, techniques, and procedures (TTPs). Build AWS-focused detections leveraging Cloud Trail, Guard Duty, IAM activity, and VPC Flow Logs. Tune and enhance detection content to improve alert accuracy and reduce false positives. Develop signatures and detections using Sigma, YARA, and IDS-based rules where appropriate.

Map detection coverage against the MITRE ATT&CK framework. SOC Operations Monitor and triage security alerts within Splunk SIEM. Investigate security incidents including phishing attacks, credential abuse, malicious process activity, and suspicious network traffic. Support incident response activities through containment and escalation procedures. Maintain detailed security case documentation and investigation notes. Contribute towards operational metrics including MTTD and MTTR targets. Essential Skills & Experience Active SC Clearance (required).

1-3 years' experience within a SOC Analyst, Security Analyst, Detection Engineer, or Security Operations role. Strong hands-on experience with Splunk and SPL query development. Experience building, tuning, and maintaining SIEM detection rules. AWS security monitoring experience including:
Cloud Trail Guard Duty IAM VPC Flow Logs Understanding of cyber attack techniques and threat detection methodologies. Knowledge of incident triage, investigation, and escalation processes. Experience working with Windows, Linux, authentication systems, and endpoint security logs. Strong communication and stakeholder engagement skills. Desirable Skills

Experience with Cribl. Knowledge of OCSF schemas and security data normalisation. Familiarity with MITRE ATT&CK and NICE Cybersecurity Frameworks.

Experience with Sigma, YARA, or IDS signature development. Exposure to Splunk SOAR, Cortex XSOAR, or other automation platforms. Scripting experience in Python, Power Shell, or Bash. Experience working within UK Government or public sector environments. Azure and/or Google Cloud Platform exposure. Reasonable Adjustments:
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