Senior Microsoft 365 Systems Engineer

Location: Bedford, UK

Duration: 3 Months

Hours: 37.5 hours per week

Rate: Dependent on experience

We are recruiting a Senior Microsoft 365 Systems Engineer to support, secure, and automate a high-concurrency global workplace environment supporting150,000+ users worldwide.

Working alongside global infrastructure, security, and networking teams, you will take ownership of enterprise messaging, identity governance, security enforcement, and PowerShell automation across the Microsoft 365 ecosystem and integrated security gateways.

• M365 & Messaging: Administer and optimize Exchange Online, Microsoft Teams, SharePoint Online, OneDrive, and Hybrid Exchange environments at scale.

• Email Security & Domain Protection: Configure, manage, and enforce email security gateways (Proofpoint) and email authentication protocols (DMARC, SPF, and DKIM).

• Identity & Security Controls: Design and manageEntra ID (Azure AD), Conditional Access policies, Multi-Factor Authentication (MFA), Single Sign-On (SSO), andPrivileged Identity Management (PIM) following Zero Trust principles.

• Automation: Write and maintain advancedPowerShell scripts and Microsoft Graph API solutions to automate administrative tasks and operational workflows.

• Compliance & Governance: Support eDiscovery, retention policies, and data protection usingMicrosoft Purview and Microsoft Defender for Office 365.

• Hybrid Systems: Support integration points across Windows Server and Linux infrastructure.

• 6+ years of hands-on Microsoft 365 systems engineering experience in large-scale enterprise environments (10,000+ users minimum).

• Deep technical expertise inExchange Online, Teams, SharePoint, and OneDrive.

• Strong hands-on experience administeringProofpoint email security platforms.

• Proven track record implementing and managingDMARC, SPF, and DKIM domain protection policies.

• AdvancedPowerShell scripting capabilities for reporting, automation, and task execution at scale.

• Expertise inEntra ID, Conditional Access, MFA, andPIM (Privileged Identity Management).

• Experience supporting bothWindows Server and Linux environments.

• Excellent troubleshooting, analytical, and technical documentation skills.

If you meet the technical criteria and have experience supporting massive enterprise M365 tenants, please submit your updated CV for immediate consideration.

Randstad Business Support is acting as an Employment Agency in relation to this vacancy.