Azure Security Engineer — SIEM, XDR & Incident Response (Contract)

jobr.pro; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Flagstone is seeking a senior security engineer to own and operate detection and incident response across our Azure cloud security stack. You will work hands-on with Microsoft Sentinel, Defender for Cloud, and XDR tooling, while coordinating remediation with engineering squads.

You'll drive security through code, pipelines, and security tooling, contributing to threat modelling and AI security considerations in a fintech context.

Qualifications

• Hands-on SIEM experience, ideally Microsoft Sentinel; equivalent platforms considered.
• Practical Azure security experience across Defender for Cloud and related services.
• Experience writing infrastructure-as-code using Terraform or Bicep in security contexts.
• Experience driving vulnerability remediation cycles with engineering teams.
• Familiarity with data-loss-prevention controls and AI security considerations.

Responsibilities

• Own and operate alerting and monitoring through a transition period, maintaining detection and response.
• Maintain and improve Microsoft Sentinel deployment: write/detect rules, manage data connectors, reduce noise.
• Operate Defender XDR and Defender for Cloud, including policy management and posture recommendations.
• Extend automated security checks in delivery pipelines (shift-left).
• Coordinate penetration test engagements and remediation with engineering squads.
• Support data-loss-prevention controls and AI security safeguards.
• Investigate suspicious activity surfaced through Sentinel and Defender; triage or contain as appropriate.
• Contribute to detection-as-code and infrastructure-as-code for security tooling.

Skills

SIEM experience

Microsoft Sentinel

Azure security

Terraform / Bicep

Vulnerability remediation

AI security considerations

Threat modelling

KQL

fintech environment experience

Tools

Microsoft Sentinel

Defender for Cloud

Terraform

Bicep

Azure Entra ID

Job description

Flagstone is seeking a senior security engineer to own and operate detection and incident response across our Azure cloud security stack. You will work hands-on with Microsoft Sentinel, Defender for Cloud, and XDR tooling, while coordinating remediation with engineering squads.

You'll drive security through code, pipelines, and security tooling, contributing to threat modelling and AI security considerations in a fintech context.