Job Title: Defender Administrator
Location: Gloucester / Warrington (Hybrid, On-Site Work Required)
Rate: £425 per day (Inside IR35)
Start Date: 30th September 2025
Duration: TBC
Role Overview:
We are looking for a skilled Defender Administrator to lead the migration from Symantec/McAfee antivirus solutions to Microsoft Defender (ATP) across Windows and Linux servers in a highly regulated environment.
Key Responsibilities:
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Migrate servers from legacy AV to Microsoft Defender ATP.
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Validate and implement AV exclusion policies.
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Design migration strategies for secure environments.
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Create and manage AAD device groups for policy deployment.
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Conduct connectivity testing, build Defender installation packages, and manage distribution.
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Remove legacy AV and ensure robust endpoint security.
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Provide end-to-end Defender support, including policy creation, monitoring, and reporting.
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Participate in out-of-hours and on-call support as required.
Skills & Experience:
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4+ years' experience onboarding Windows and Linux servers to Microsoft Defender.
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Proven AV migration experience in complex environments.
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Strong knowledge of Microsoft security tools (Defender for Endpoint, O365, Identity, Cloud App Security).
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Expertise in EDR, Threat & Vulnerability Management, Attack Surface Reduction, and Auto Remediation.
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Experience with Symantec Endpoint Protection and McAfee.
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Strong Windows (7/8/10, Server 2008-2016) and RHEL Linux knowledge.
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Deployment experience via GPO, SCCM, or Intune.
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Eligible for UK Security Clearance (5 years UK residency required).
If you are interested please email your CV to for immediate consideration
JBRP1_UKTJ