Senior Microsoft O365 Security Engineer

Overview

We are seeking an experienced Microsoft 365 Security Architect / Technical Lead to provide strategic direction, technical leadership, and hands‑on expertise in designing and implementing enterprise‑grade M365 security solutions. This role will focus on securing hybrid IT/OT environments while ensuring compliance, scalability, and operational excellence across the M365 ecosystem.

Key Responsibilities

• Provide strategic guidance, oversight, and technical leadership for enterprise‑wide M365 deployments across IT and OT environments
• Architect, design, and implement end‑to‑end M365 security solutions across on‑premises, hybrid, and cloud (Azure & AWS) environments
• Lead the implementation and management of M365 security and compliance tools, including:
  • Microsoft Defender (EDR, Email Security)
  • Microsoft Purview (DLP, Compliance, Governance)
  • Entra ID (Identity & Access Management)
  • Intune (Endpoint & Policy Management)
  • SharePoint, Teams, OneDrive
• Develop and execute security strategies for Defender and Purview, ensuring full coverage across environments
• Perform risk assessments to identify gaps in security posture and recommend remediation strategies
• Monitor and research emerging threats, attack vectors, and evasion techniques
• Lead technical design documentation, including architecture diagrams, implementation plans, and test strategies
• Collaborate with cross‑functional teams (Security Engineering, SOC, Infrastructure, Compliance, and Business Stakeholders)
• Facilitate technical working sessions and stakeholder engagements
• Support Proof of Concepts (PoCs) and conduct Analysis of Alternatives (AoA) for security solutions
• Develop scope, cost estimates, and deployment schedules for M365 initiatives
• Contribute to business continuity and disaster recovery planning
• Apply SDLC best practices in solution design, testing, and deployment

Required Qualifications

• Ability to obtain Public Trust clearance
• 10+ years of experience in M365 security architecture, administration, and deployment
• Strong hands‑on expertise with:
  • Microsoft Defender (Endpoint, Email Security)
  • Microsoft Purview (DLP, eDiscovery, Compliance)
  • Entra ID (Azure AD)
  • Microsoft Intune
  • Microsoft Sentinel
  • SharePoint, Teams, OneDrive
• Proven experience implementing security solutions across hybrid and cloud environments
• Strong understanding of:
  • Identity & Access Management (IAM)
  • Threat detection and incident response
  • Security telemetry and automation
• Experience with compliance frameworks (NIST, ISO 27001, SOC 2)
• Proficiency in PowerShell scripting
• Experience with O365 integrations and cloud security architecture
• Strong documentation skills (technical reports, architecture diagrams, SOPs)
• Excellent communication skills with ability to present to stakeholders
• Ability to work both independently and collaboratively

Preferred Certifications

• Microsoft Certified: MS-102 (Microsoft 365 Administrator Expert)
• Microsoft Certified: MS-900 (Microsoft 365 Fundamentals)

Education

• Bachelor’s degree in Information Technology, Computer Science, Engineering, or related field

Benefits

PEAK's benefit offerings available for our associates include medical, dental, vision, Flexible Spending Account (FSA), Dependent Care Savings Account (DCA), and 401K plan. PEAK believes that taking care of our team is essential for success and we are proud to provide benefits that enhance both your well‑being and your future. Additionally, our associates may be eligible for Paid Sick Leave as required by Federal, State, or local laws.

Equal Opportunity Employer (EEO)

PEAK Technical Staffing is committed to creating a diverse and inclusive environment and is proud to be an Equal Opportunity Employer. PEAK does not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other characteristic protected by applicable law. All employment decisions are made based on qualifications, merit, and business need. We encourage all individuals to apply.

Americans Disabilities Act (ADA)

The physical and mental requirements described in this job description are representative of those that must be met by an employee to successfully perform the essential functions of the position. Reasonable accommodations may be made to enable qualified individuals with disabilities to perform the essential functions. Must be able to perform the essential physical functions of the position, including sitting, standing, walking, stooping, kneeling, and lifting up to 25 pounds, with or without reasonable accommodation.

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