Senior Microsoft 365 Systems Engineer

Randstad Delivery (GBS); Bedford; On-site; GBP 83,000 - 120,000; Part time

Job summary

Randstad Delivery (GBS) in Bedford, UK is seeking a Senior Microsoft 365 Systems Engineer to support, secure, and automate a high‑concurrency global workplace with 150,000+ users. You will join global infrastructure, security, and networking teams to own enterprise messaging, identity governance, security enforcement, and PowerShell automation across the M365 ecosystem.

The role focuses on Exchange Online, Teams, SharePoint, OneDrive, Entra ID, MFA, SSO, PIM, DMARC/SPF/DKIM, and governance with

Qualifications

• 6+ years of hands-on Microsoft 365 systems engineering in large enterprises.
• Deep expertise in Exchange Online, Teams, SharePoint Online, and OneDrive.
• Experience administering Proofpoint and domain protection (DMARC/SPF/DKIM).
• Strong PowerShell scripting for automation and reporting.
• Familiarity with Entra ID, Conditional Access, MFA, and PIM.
• Experience across Windows Server and Linux environments.

Responsibilities

• Administer and optimize Exchange Online, Teams, SharePoint Online, OneDrive, and hybrid Exchange.
• Configure and enforce email security gateways and DMARC/SPF/DKIM protections.
• Design and manage Entra ID with CA, MFA, SSO, and PIM following Zero Trust.
• Develop PowerShell scripts and Graph API solutions to automate tasks.
• Support governance using Microsoft Purview and Defender for Office 365.
• Collaborate with global teams across Windows Server and Linux environments.

Skills

PowerShell scripting

Microsoft Graph API

Exchange Online administration

Entra ID / Azure AD

Security governance

Tools

Proofpoint

Microsoft Purview

Microsoft Defender for Office 365

PowerShell

Microsoft Graph API

Job description

Job Title: Senior Microsoft 365 Systems Engineer

Location: Bedford, UK

Duration: 3 Months

Hours: 37.5 hours per week

Rate: Dependent on experience

About the Role

We are recruiting a Senior Microsoft 365 Systems Engineer to support, secure, and automate a high-concurrency global workplace environment supporting 150,000+ 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.

Key Responsibilities

• 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 manage Entra ID (Azure AD), Conditional Access policies, Multi-Factor Authentication (MFA), Single Sign-On (SSO), and Privileged Identity Management (PIM) following Zero Trust principles.
• Automation: Write and maintain advanced PowerShell scripts and Microsoft Graph API solutions to automate administrative tasks and operational workflows.
• Compliance & Governance: Support eDiscovery, retention policies, and data protection using Microsoft Purview and Microsoft Defender for Office 365.
• Hybrid Systems: Support integration points across Windows Server and Linux infrastructure.

Required Qualifications & Experience

• 6+ years of hands-on Microsoft 365 systems engineering experience in large-scale enterprise environments (10,000+ users minimum).
• Deep technical expertise in Exchange Online, Teams, SharePoint, and OneDrive.
• Strong hands-on experience administering Proofpoint email security platforms.
• Proven track record implementing and managing DMARC, SPF, and DKIM domain protection policies.
• Advanced PowerShell scripting capabilities for reporting, automation, and task execution at scale.
• Expertise in Entra ID, Conditional Access, MFA, and PIM (Privileged Identity Management).
• Experience supporting both Windows Server and Linux environments.
• Excellent troubleshooting, analytical, and technical documentation skills.