Senior MXDR Security Engineer - SIEM, MITRE ATT&CK

Senior MXDR Security Engineer - SIEM, MITRE ATT&CK

Posted 1 day ago by 1754128792

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£650 Per day
Inside
Onsite
London
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Cyber Defense Data Visualisation Device Tracking Software Finance Investments MITRE ATT&CK Framework Service Review Splunk Threat Detection Workbooks CRM

Summary: Senior MXDR Security Engineer position available at a leading investment bank in London, focusing on the development and refinement of security monitoring use cases and rulesets. The role requires hands-on experience with MXDR/SIEM tools and a strong understanding of threat detection practices. The position is inside IR35 and requires three days a week on-site work. Candidates should possess excellent communication skills and a passion for continuous improvement in cyber defense.

Key Responsibilities:

  • Development of use cases and rulesets across multiple log sources.
  • Performing regular rule refinement sessions to address rule logic issues and false positives.
  • Output activities from refinement sessions such as development and/or refinement of rules and workbooks.
  • Optimisation activities such as log utilisation tracking and refinement.
  • MITRE ATT&CK heat map coverage.
  • Working with internal ITC teams and the Customer to identify any onboarding or offboarding projects of appropriate log sources necessary for effective security monitoring.
  • Identification of opportunities for additional monitoring.
  • Workbook creation for data visualisation.
  • Attendance at Service Review Meetings.
  • Maintenance of Service Documentation such as LLD (co-management activity).

Key Skills:

  • Hands-on MXDR/SIEM experience (e.g., Sentinel, Splunk, QRadar)
  • Strong telemetry parsing/enrichment skills
  • Solid grasp of MITRE ATT&CK & threat-detection best practices
  • Clear communicator with a customer-focused mindset
  • Passion for continuous improvement in cyber defence

Salary (Rate): £650 per day

City: London

Country: United Kingdom

Working Arrangements: on-site

IR35 Status: inside IR35

Seniority Level: Senior

Industry: IT

Detailed Description From Employer:

Senior MXDR Security Engineer sought by leading investment bank based in the city of London.

**Inside IR35 - 3 days a week on site**

What You'll Do:

  • Development of use cases and rulesets across multiple log sources.
  • Performing regular rule refinement sessions to address rule logic issues and false positives.
  • Output activities from refinement sessions such as development and/or refinement of rules and workbooks.
  • Optimisation activities such as log utilisation tracking and refinement.
  • MITRE ATT&CK heat map coverage.
  • Working with internal ITC teams and the Customer to identify any onboarding or offboarding projects of appropriate log sources necessary for effective security monitoring.
  • Identification of opportunities for additional monitoring.
  • Workbook creation for data visualisation.
  • Attendance at Service Review Meetings.
  • Maintenance of Service Documentation such as LLD (co-management activity).

Skills required:

  • Hands-on MXDR/SIEM experience (e.g., Sentinel, Splunk, QRadar)
  • Strong telemetry parsing/enrichment skills
  • Solid grasp of MITRE ATT&CK & threat-detection best practices
  • Clear communicator with a customer-focused mindset
  • Passion for continuous improvement in cyber defence

Please apply within for further details.

Alex Reeder
Harvey Nash Finance & Banking

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