Interquest have a need for an experienced O365 /Platform Security Engineer to support a leading government client. The role is based in London and will need 2 days on site. Background skills required. • Policy Enforcement: Implement Conditional Access, MFA, and DLP policies. Maintain security posture using Secure Score and Compliance Manager • Zero Trust Network: Contribute to AD and security-related configurations supporting Zero Trust principles and related BAU work. • ServiceNow Ticketing: Handle incidents, service requests, and mini projects. BAU typically accounts 40% of workload. • PowerShell Scripting: Automate routine tasks and configurations across O365 services • Policy Development: Support creation and enforcement of Council-wide O365 usage policies • Configure and maintain Sentinel workspaces aligned with Council tenancy and compliance requirements. • Integrate data sources including Defender for Endpoint, Defender for Identity, Office 365 audit logs, Azure AD, and third-party connectors. • Develop and implement playbooks and alert rules for automated incident response. • Collaborate with the Service Desk to triage and escalate Sentinel alerts. • Administer and maintain Microsoft 365 services including Exchange online, Exchange on prem and managing hybrid setup. • Administer and optimise Microsoft Defender XDR solutions including Defender for Cloud Apps, Defender for Office 365, and Defender for Identity. • Implement Conditional Access, Multi-Factor Authentication (MFA), and Identity Protection policies. • Configure Data Loss Prevention (DLP), Information Protection, and Insider Risk Management policies using Microsoft Purview. • Proven expertise in Microsoft Sentinel and Office 365 E5 security products. • Strong understanding of Azure services, including Azure AD, Defender for Cloud, and Logic Apps. • Experience with SIEM/SOAR platforms, KQL, and automation workflows. • Familiarity with compliance frameworks: ISO 27001, NIST, PCI-DSS, GDPR. • Excellent communication and stakeholder engagement skills. • Certifications such as SC-100, AZ-500, MS-500, or equivalent are highly desirable. InterQuest Group is acting as an employment agency for this vacancy. InterQuest Group is an equal opportunities employer and we welcome applications from all suitably qualified persons regardless of age, disability, gender, religion/belief, race, marriage, civil partnership, pregnancy, maternity, sex or sexual orientation. Please make us aware if you require any reasonable adjustments throughout the recruitment process.