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# Security Engineer -M365 E5/Defender XDR/Sentinel/Azure AD

- **Company:** TRIA
- **Location:** Bletchley, UK
- **Salary:** £156,000 - £182,000
- **Contract:** Temporary contract
- **Skills:** Microsoft Access, Microsoft Windows, Microsoft Azure, Microsoft Online Services, Business Software, Cloud Computing, Cyber Security, Identity and Access Management, Intrusion Detection and Prevention, Microsoft Dynamics, Microsoft Security Essentials, Windows PowerShell, Azure Active Directory, Security Information and Event Management, Microsoft Sentinel
- **Published:** November 8, 2026
- **Apply:** https://jobsthamesvalley.co.uk/jobs/apply/ats-redirect/?id=3059718566-2

## About the Role

We are seeking an experienced Security Engineer to support and enhance our Microsoft security capabilities across infrastructure, cloud, identity, and business applications. This is a hands-on contract opportunity for a security professional with strong expertise across the Microsoft security stack, including Defender XDR, Microsoft Sentinel, Entra ID, and Dynamics 365.

The successful candidate will play a key role in strengthening security operations, improving threat detection, enhancing monitoring capabilities, and securing critical business platforms.

Essential Skills & Experience

 * Proven experience working as a Security Engineer, Cyber Security Engineer, or Security Operations Engineer.
 * Strong hands-on experience with:

 * Microsoft Defender XDR
 * Microsoft Sentinel (SIEM/SOAR)
 * Microsoft Entra ID (Azure Active Directory)
 * Identity and Access Management (IAM)
 * Microsoft 365 E5 Security
 * Security monitoring and detection engineering
 * Incident response and threat investigation
 * Dynamics 365 (D365) security administration and monitoring

Experience designing and implementing enterprise security monitoring and threat detection solutions.

Strong understanding of Microsoft cloud security architecture and best practices.

Experience working within Azure-based environments.

Ability to operate independently and deliver security outcomes in a fast-paced environment.

Desirable Skills

 * Microsoft certifications such as:

 * SC-200 Microsoft Security Operations Analyst
 * SC-300 Identity and Access Administrator
 * AZ-500 Azure Security Engineer Associate
 * SC-100 Cybersecurity Architect

PowerShell scripting and automation experience.

Previous experience within regulated or enterprise-scale environments.

If you are a hands-on Security Engineer with deep expertise across Defender XDR, Sentinel, Entra ID, IAM, and Microsoft security technologies, we'd like to hear from you.