Senior Security Engineer

Senior SIEM Engineer / Technical SME

💰 £500/day (Inside IR35) |📍 Remote (Occasional travel to Guildford)

📅 6-Month Contract (Start: ASAP)

Our client, a top global organization, is seeking a Senior SIEM Engineer / Technical SME to lead the design, implementation, and optimisation of enterprise SIEM capabilities within a modern cybersecurity environment.

This is a hands-on technical leadership role focused on Microsoft Sentinel, detection engineering, and threat hunting, ensuring high-quality telemetry, reliable platform performance, and advanced security analytics.

Key Responsibilities

• Act as the technical SME for Microsoft Sentinel
• Develop and maintain detection rules using Kusto Query Language (KQL)
• Perform threat hunting and analytics using KQL
• Design and manage SIEM architecture and data pipelines
• Onboard log sources into Sentinel (end-to-end)
• Ensure platform reliability, performance, and data quality
• Configure connectors, analytics rules, and workbooks
• Integrate cloud and on-prem logging (Windows, Linux, applications, identity)
• Support use of AI-assisted security tools (e.g. Copilot for Security)
• Collaborate with security stakeholders and provide technical guidance

Essential Skills & Experience

• Expert-level Kusto Query Language (KQL)
• Strong experience with Microsoft Sentinel (technical SME level)
• Experience in SIEM implementation and optimisation
• Strong understanding of logging across cloud and on-prem environments
• Experience onboarding data via AMA, DCRs, Syslog/CEF, Event Hub
• Threat detection, analytics, and threat hunting experience
• Experience with security monitoring and incident detection
• Strong understanding of cybersecurity principles
• Hands-on experience with Azure security ecosystem
• Strong communication and stakeholder engagement skills

Desirable Experience

• Experience with AI-assisted security tools (e.g. Microsoft Copilot for Security)
• Experience in enterprise-scale SOC environments
• Knowledge of security frameworks and best practices
• Experience improving detection coverage and reducing false positives

If this is relevant to your experience, please apply with your CV and we'll be in touch.