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 (eg, 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