Senior Security Engineer - SIEM, KQL

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

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
  • 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.
• • 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 - Alex Reeder Harvey Nash