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Microsoft 365 Administration
Tenant management, licensing, users, groups, Exchange Online, Defender, and secure configuration basics.
Omar Garcia • Infrastructure Portfolio
Microsoft 365, identity, and homelab infrastructure.
Heimdall Servers is a hands-on portfolio documenting Microsoft 365 administration, Entra ID, Exchange Online, email security, Linux, Docker, NGINX Proxy Manager, Cloudflare, and self-hosted systems.
About
Built around practical support, secure defaults, and clean handoffs.
This portfolio focuses on real-world IT work: identity, email, tenant administration, endpoint support, documentation, troubleshooting, and infrastructure practice.
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Identity & Access
Entra ID, MFA, Conditional Access, risky sign-ins, admin protection, and break-glass planning.
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Infrastructure Support
Linux, Docker, Portainer, NGINX Proxy Manager, Cloudflare DNS, and self-hosted services.
Homelab Map
Self-hosted infrastructure as a real practice environment.
The lab is where services are tested, broken, documented, rebuilt, and improved. It connects Linux administration, Docker containers, reverse proxy routing, DNS, SSL, and monitoring-style thinking into one practical environment.
Current stack: Ubuntu server, Docker, Portainer, NGINX Proxy Manager, Cloudflare DNS, and hosted web services.
CloudflareDNS / proxy
NGINX Proxy80 / 443 edge
Portainercontainer control
Docker HostUbuntu server
Hosted Appsweb services
Certifications
Microsoft certification path with practical infrastructure overlap.
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MS-900 — Microsoft 365 Fundamentals
Cloud concepts, Microsoft 365 services, security, compliance, licensing, and support fundamentals.
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SC-300 — Identity and Access Administrator
Entra ID, MFA, Conditional Access, application access, identity governance, and identity security.
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MS-102 — Microsoft 365 Administrator
Tenant administration, identity, security, compliance, apps, and Microsoft 365 operational management.
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SC-200 — Security Operations Analyst
Defender XDR, Sentinel, alert triage, investigations, hunting, and response workflows.
Resume
Systems administration, managed services, and infrastructure experience.
A web-friendly overview pulled from Omar Garcia’s professional resume, with a direct download available below.
Professional Summary
IT Systems Administrator
Over 10 years of IT and telecommunications experience, including 6+ years supporting managed services clients. Experienced with Microsoft 365 administration, Intune, SharePoint, Windows Server infrastructure, networking, VPNs, firewalls, virtualization, cloud migrations, CCTV, access control, structured cabling, hospitality technologies, backup, and disaster recovery.
Kortech Communications — IT Systems Administrator
Escalation support, Microsoft 365 tenant administration, Exchange Online, DNS, SharePoint, Intune, file servers, virtual machines, VPNs, firewalls, switching, wireless networks, documentation, migrations, backups, and onsite deployments.
Dirbos — IT Support / Systems Administration
Systems administration and technical support across multiple client environments, including Microsoft 365, endpoint management, networking, business-critical applications, backup administration, and infrastructure projects.
Brea Networks — IT Support Specialist
Managed SMB support, ticket triage, client follow-up, Microsoft 365, Windows Server, endpoints, networking, cloud services, backup monitoring, restorations, documentation, migrations, CCTV, and onsite project work.
Spectrum — Field Technician V
Business and residential internet, voice, video, cabling, routers, wireless networks, site surveys, escalated troubleshooting, and technician mentoring.
Microsoft 365Exchange OnlineEntra IDIntuneSharePointWindows ServerActive DirectoryFirewallsVPNsWi‑FiVirtualizationBackup & Disaster RecoveryStructured CablingTechnical Documentation
Technical Notes
Proof-of-work writeups to add over time.
These can become portfolio posts later. Keep them sanitized: no client names, private screenshots, domains, IPs, or internal ticket data.
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Scan-to-email in Microsoft 365
SMTP AUTH, Exchange connectors, app passwords, legacy MFP limitations, and mail-flow troubleshooting.
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Conditional Access Baseline
MFA, admin accounts, risky sign-ins, trusted locations, break-glass access, and rollout planning.
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Self-hosting Behind NGINX
Cloudflare DNS, reverse proxy hosts, SSL certificates, Docker services, and clean deployment notes.
Contact
Let’s connect.
Add LinkedIn, Microsoft Learn, GitHub, or a professional email when ready.