Job Title: Defender Administrator (Contract) Location: Gloucester or Warrington (Hybrid on-site) Rate: £370/Day Inside IR35 Clearance: Must hold or be eligible for Security Clearance (minimum 5 years UK residency) About the Role We are recruiting an experienced Defender Administrator to support a large-scale migration programme, transitioning Windows and Linux servers from legacy antivirus solutions (Symantec/McAfee) to Microsoft Defender (ATP). You will play a key role in designing and implementing migration approaches within a complex and sensitive environment. Key Responsibilities * Migrate Windows and Linux servers to Microsoft Defender (ATP). * Validate existing antivirus exclusion policies across the estate. * Implement MDE policies and create AAD device groups. * Develop migration approaches suitable for complex and sensitive infrastructures. * Perform network connectivity testing and ensure readiness for deployment. * Create and distribute Defender installation packages. * Lead discussions with the image management team regarding MDE images for auto-scaling. * Remove legacy AV solutions from servers. * Provide end-to-end support for Microsoft Defender. Required Skills & Experience * 4+ years’ experience onboarding Windows and Linux servers to Microsoft Defender. * Strong experience migrating from Symantec and McAfee. * Expertise in AV exclusion management....