Active Directory & Windows Server
Domain services, domain controllers, organizational units, DNS integration, replication, FSMO roles, and Windows Server lifecycle operations.
Microsoft infrastructure • Active Directory • Identity
Building and supporting secure enterprise Windows environments.
I'm Demarko Little, a Windows Infrastructure and Active Directory Engineer with more than 20 years of experience supporting federal enterprise IT environments. This portfolio highlights my engineering background, practical lab work, and ongoing technical projects.
Professional Summary
Systems Engineer with 20+ years of experience supporting Microsoft Windows Server, Active Directory, enterprise infrastructure operations, migrations, security, and high-availability environments for federal government organizations. My current focus is Active Directory engineering, identity and access management, Group Policy, DNS, PowerShell, and reliable Windows infrastructure operations.
Core engineering focus
Microsoft infrastructure and identity
Hands-on experience and continued technical development across the systems that keep enterprise Windows environments secure, available, and manageable.
Identity & Access Management
Account lifecycle administration, group-based access, least privilege, delegated administration, authentication, and authorization concepts.
Group Policy & PowerShell
Policy management, troubleshooting, security filtering, administrative scripting, validation, and repeatable Windows operations.
Infrastructure Modernization
Windows platform migrations, operational readiness checks, service continuity, and change validation in enterprise environments.
Security & Troubleshooting
Authentication issues, access failures, DNS and domain controller health, account lockouts, and structured root-cause investigation.
Endpoint & Systems Management
Enterprise systems administration, Microsoft Endpoint Configuration Manager, application deployment, patching, and support workflows.
Engineering portfolio
Current Microsoft infrastructure projects
Practical projects built to demonstrate design decisions, implementation, troubleshooting, and verification—not just screenshots of completed tasks.
Active Directory modernization lab
Windows Server 2016 → 2025 Active Directory Migration
Side-by-side migration lab using Windows Server 2016 and 2025, with domain-joined Windows 11 clients, organizational units, users, security groups, DNS validation, and migration planning. The project emphasizes service continuity and evidence-based validation.
Hands-on directory services lab
Active Directory Operations & Troubleshooting
Multi-domain-controller lab for Group Policy, account administration, Kerberos, replication, DNS/DC locator, domain controller resilience, and practical PowerShell verification.
Planned implementation
Enterprise File Services & Access Control
Planned Windows member-server project covering departmental SMB shares, Active Directory security groups, NTFS and share permissions, and Group Policy drive mapping, with documented access validation.
Ongoing technical practice
PowerShell Administration & Health Checks
Practical command-line exercises for Active Directory administration, domain controller health, DNS verification, replication, and troubleshooting, with an emphasis on safe, repeatable procedures.
Professional background
Enterprise experience that informs the lab work
Federal infrastructure operations
Over two decades supporting IT infrastructure for federal organizations, with experience spanning Windows administration, enterprise migrations, infrastructure support, operations, security, and system reliability.
One representative accomplishment: consolidating more than 300 Group Policy Objects during a Windows 7-to-Windows 10 migration, using controlled pilot validation and policy-result verification.
Engineering approach
- Understand the system and dependencies before making changes.
- Validate DNS, authentication, replication, and policy behavior.
- Apply least privilege and document access decisions.
- Use repeatable commands and evidence to confirm outcomes.
Connect
Let's talk Microsoft infrastructure and identity.
Interested in my Active Directory, IAM, or Windows Infrastructure engineering background? Reach out through email or LinkedIn, or explore the technical work on GitHub.
Please don't send passwords, private keys, or sensitive production information by email.