I'm a Network Administrator in public-sector IT. I started in frontline support, including a role as an IT Support Specialist. Today I troubleshoot across networks, servers, cloud services, and endpoints, and use PowerShell to automate repeatable work.
My work spans Windows Server and Ubuntu Linux, Cisco switching and SonicWall firewalls, Azure, and Microsoft 365 administration. That includes Exchange Online, Teams, Microsoft Entra ID, Microsoft Defender, and Microsoft Purview. Technical skills and experience
I earned my computer science degree at the University of Washington Bothell, where I'm now pursuing a Master of Science in Computer Science & Software Engineering. I'm also working toward additional professional certifications.
My personal projects explore release automation, verification, and recovery planning.
- DNS or Connectivity? How to Triage an Unreachable Service
- Microsoft Entra Sign-In Troubleshooting Framework
- Pomodoro Timer: Controlled Releases on Azure
- Where Did the Email Go? Troubleshooting Exchange Online with Message Trace
- Building a Practical Microsoft Entra Sign-In Troubleshooting Framework
- Building a Practical Microsoft 365 Service Ownership Framework
My public examples use personal, lab, or sanitized data. All projects · All technical articles
Microsoft 365, Identity & Security
- Microsoft 365 Certified: Administrator Expert
- Microsoft 365 Certified: Teams Administrator Associate
- Microsoft 365 Certified: Endpoint Administrator Associate
- Microsoft Security, Compliance, and Identity Fundamentals
- Microsoft 365 Fundamentals
- Microsoft Azure Fundamentals
Networking & Core IT
Cloud
- Website: dleontev.com
- LinkedIn: linkedin.com/in/dleontev
- Email: info [@] dleontev.com