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Security Engineer - SIEM

Harvey Nash UK • City of London, London • 3d ago

Security Engineer - SIEM - sought by investment bank based in London - Contract - Hybrid

*Inside IR35 - umbrella*

Key Responsibilities

SIEM Management & Optimization:
- Design, implement, and maintain Microsoft Sentinel workspaces, connectors, analytics rules, and playbooks
- Develop advanced KQL queries for threat hunting and reporting
- Optimize SIEM performance, cost, and data retention policies
- Troubleshoot log ingestion and parsing issues
Log Source Integration:
- Onboard and configure critical log sources (AD, firewalls, servers, cloud infrastructure)
- Manage event collection and forwarding infrastructure
- Implement data filtering and custom log parsing
Threat Detection & Use Case Development:
- Develop and refine detection rules based on threat intelligence and attack patterns
- Continuously improve detection efficacy and reduce false positives
Security Monitoring & Incident Response:
- Monitor systems for anomalies and malicious activity
- Contribute to threat hunting and incident response playbooks
- Provide expert guidance on securing applications and infrastructure
Security Advisory & Innovation:
- Support PoCs for new security tools
- Help define and measure control effectiveness

Required Skills & Experience

3+ years in a Security Engineer, SOC Analyst, or similar role
Hands-on experience with Microsoft Sentinel and KQL
Strong knowledge of Active Directory, Windows/Linux systems, and cloud platforms (Azure, AWS, GCP)
Proficiency in scripting (PowerShell, Python)
Familiarity with security frameworks (MITRE ATT&CK, NIST, Kill Chain)
Experience with EDR, DLP, Proxy, and SEG tools

Desirable Qualifications

Certifications: AZ-500, SC-200, SC-900, CompTIA Security+, CISSP, GCIA, GCIH, GCFA, CCSP
Experience with SOAR playbooks, YARA rules, STIX, and YAML
Participation in red/purple team exercises

Please apply within for further details - Matt Holmes, Harvey Nash

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