Senior Microsoft Security Engineer – Security Hardening (3-Month Contract)

3-Month Contract | Mississauga, ON | Hybrid

The Opportunity

Our client, a large global software organization, is seeking an experienced Senior Microsoft Security Engineer to support a focused security hardening initiative across its Microsoft environment.

This is a hands-on consulting engagement requiring someone who can assess existing configurations, identify security gaps, develop recommendations and, most importantly, implement remediation measures across Active Directory, Entra ID, Microsoft 365 and Intune.

Key Responsibilities

• Assess and harden Active Directory, Entra ID and Microsoft 365 environments against Microsoft and CIS security best practices.
• Review and strengthen identity security, privileged access, MFA, Conditional Access and Privileged Identity Management (PIM).
• Evaluate and remediate Group Policy, application permissions, access controls and legacy authentication protocols.
• Review Intune configurations, endpoint security policies and Windows security baselines.
• Implement improvements to M365 security, including administrative roles, external sharing, audit controls and information protection.
• Identify inactive accounts, excessive permissions and configuration vulnerabilities; implement appropriate remediation.
• Develop and execute automation using PowerShell and Microsoft Graph to support security improvements.
• Document findings, remediation activities and recommendations.
  

Required Experience

• Strong hands-on experience securing Microsoft environments, including Active Directory, Entra ID and Microsoft 365, Defender/Crowdstrike
• Demonstrated experience with security assessments, configuration hardening and remediation.
• Strong knowledge of Conditional Access, MFA, PIM, privileged access and identity governance.
• Experience with Group Policy, Intune, Windows security baselines and hybrid identity environments.
• Proficiency with PowerShell and Microsoft Graph automation.
• Familiarity with Microsoft security frameworks and CIS benchmarks.
• Ability to work independently, assess risks and translate findings into practical technical improvements.

Engagement: Initial 3-month contract

Location: Mississauga, ON – Hybrid/Remote

This is an excellent opportunity for a hands-on Microsoft security specialist to make a tangible impact on the security posture of a large, complex global environment.