Derrick Holmes
Systems Administrator | Transitioning To Cybersecurity
Houston
Summary
Driven Systems Administrator with 3+ years of IT experience and a strong foundation in cybersecurity. Skilled in Active Directory, endpoint protection, user access management, and system hardening. Trained through Google’s Cybersecurity Certificate, TryHackMe labs, and hands-on work with Splunk, Wireshark, and Microsoft 365. Currently pursuing Security+ and ISC² CC to transition fully into a Security Administrator or Analyst role.
Overview
4
4
years of professional experience
6
6
Certifications
Work History
System Administrator
TAI Engineers, LLC
10.2022 - Current
- Managed user accounts and permissions using Active Directory and Microsoft 365
- Applied system updates and security patches to protect infrastructure and minimize vulnerabilities
- Configured secure endpoint settings and supported antivirus/anti-malware tools across all workstations
- Assisted in onboarding/offboarding with strict access control procedures
- Collaborated with internal teams to monitor systems and apply cybersecurity best practices
- Performed Tier 2 technical support, achieving 99% + system uptime
Help Desk Technician
Insight Global
08.2022 - 09.2022
- Delivered remote IT support for 200+ Home Depot employees, resolving access, connectivity, and software issues across multiple platforms
- Used Active Directory and ServiceNow for user provisioning, password resets, and permission changes
- Supported Microsoft 365 applications including Outlook, SharePoint, and OneDrive
- Collaborated with internal teams via Slack and Microsoft Teams to resolve and escalate technical issues efficiently
IT Support Specialist
Trimac Transportation
05.2021 - 12.2021
- Provided Tier 1–2 technical support for 100+ users across U.S. and international offices
- Managed user accounts and permissions via Active Directory and Microsoft 365 Admin Center
- Imaged, configured, and deployed laptops/desktops using SCCM
- Resolved technical issues through ServiceNow, meeting SLA requirements and improving response times
- Supported endpoint deployment, O365 applications, SharePoint, and mobile device management
Education
High School Diploma -
The Academy Of Viola Dewalt High School
La Porte, TX 05.2001 -
Skills
Active Directory
Microsoft 365 Administration
User Access Management
Windows Server
Endpoint Skills
System Hardening
Patch Management
Networking (DNS, DHCP, TCP/IP)
SIEM (Splunk, Azure Sentinal)
Wireshark
TryHackMe Labs
Virtual Machines (VMware, VirtualBox)
Certification
CompTIA Security+ - In Progress (Targeting Fall 2025)
Timeline
System Administrator
TAI Engineers, LLC
10.2022 - Current
Help Desk Technician
Insight Global
08.2022 - 09.2022
IT Support Specialist
Trimac Transportation
05.2021 - 12.2021
High School Diploma -
The Academy Of Viola Dewalt High School
05.2001 -
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