Gabe Corsini - Microsoft Identity Architect

About

I'm a Principal Architect at GuidePoint Security, focused on Microsoft Security architecture across identity, M365, Intune, Purview, and XDR. But if you ask what I'm truly obsessed with, the answer is simple: Microsoft Entra and enterprise identity architecture.

I run @atomicentra — a community focused on making Microsoft Entra concepts practical and accessible. My background spans 10 years in the U.S. Navy, large-scale M365 deployments, and hands-on identity architecture for enterprises of all sizes.

Focus: Going deeper into the Entra ecosystem — contributing to the community, building in public, and helping organizations design identity-first architecture at scale.

Experience

Principal Architect — Microsoft Security

GuidePoint Security | May 2025 - Present
  • Lead Microsoft Security architecture strategy across identity, M365, Intune, Purview, and XDR for enterprise clients
  • Design and deliver Entra ID and Identity Governance architectures — Conditional Access, PIM, Entitlement Management, and Lifecycle Workflows
  • Lead Zero Trust identity strategy engagements, translating Microsoft's frameworks into practical, operable architecture
  • Architect SSO, SAML/OIDC integrations, and Entra External ID deployments across complex enterprise environments
  • Provide technical leadership and mentorship to Microsoft security architects while staying deeply hands-on in delivery

Solutions Architect — Microsoft Cloud Security

Ardalyst | Jan 2023 - May 2025
  • Architected Entra ID and identity governance for 60+ Microsoft 365 environments, ensuring compliance with CMMC, DFARS, and industry standards
  • Designed and deployed Conditional Access, PIM, and Zero Trust identity architectures from the ground up
  • Led SSO and federated identity integrations across enterprise application portfolios
  • Delivered M365 security hardening, threat protection, and governance strategies
  • Provided pre- and post-sales identity architecture support across the full customer lifecycle

Information Systems Technician First Class

U.S. Navy | 2012 - 2022
  • Managed secure communications and security operations for mission-critical defense systems
  • Led Microsoft 365 deployment for Operation Flank Speed, supporting 500,000+ users with secure identity and access management
  • Implemented Entra ID and security solutions during large-scale remote work transformation
  • Maintained classified system security protocols and incident response procedures

Skills

Entra ID & Core IAM

Entra ID Conditional Access PIM / PAM Token Architecture SAML / OIDC / OAuth Authentication Flows

Identity Governance

Entra ID Governance Entitlement Management Lifecycle Workflows Access Reviews Entra Verified ID External Identities

Architecture & Zero Trust

Identity-First Design Zero Trust Architecture SSO Strategy Cloud Security Architecture Governance & Scalability

Microsoft Security Ecosystem

Defender XDR Microsoft Sentinel Purview / DLP Intune M365 Hardening

Philosophy

Identity is the new perimeter — and the architecture behind it determines everything. My mission is to go deep on Microsoft Entra, share what I learn, and help build the next generation of identity-first organizations.