Systems Engineer - Microsoft 365 Security & Compliance / Endpoint Security Engineer (GCC)
Leidos
Description Leidos is seeking an experienced M365 Security and Compliance Administrator to join our Information Technology team. This role requires a seasoned professional who can strategically manage and enhance the security and compliance posture of the...
Job description
The engineer is responsible for protecting enterprise Windows, macOS, iOS/iPadOS endpoints; ensuring compliant, reliable access to M365 services, and driving rapid engineering responses to vulnerabilities, outages, and operational risks. The successful candidate will apply with deep technical expertise, cross-platform engineering capability, and high operational security judgment.
Role Summary: Responsible for securing and maintaining compliance of the Microsoft 365 (M365) ecosystem and enterprise endpoints. Leads security governance, implements and enforces controls across M365, email, identity, devices, and telemetry, and provides incident response and audit/ATO support to ensure alignment with federal and organizational security requirements.
Primary Responsibilities
Strategic security oversight & governance
Lead the development, implementation, and ongoing management of M365 security policies, standards, and technical guardrails aligned to federal requirements and organizational controls.
Own governance for data protection capabilities including document classification, labeling, retention, and Data Loss Prevention (DLP) using Microsoft Purview.
Email security & compliance management (Exchange Online)
Define and enforce email security policies such as encryption, sensitivity labeling, and secure mail flow to reduce unauthorized disclosure.
Implement and mainta