Mark Smith
About Projects Experience Credentials Contact
IT infrastructure and security · El Paso, TX

Mark Smith

I like building and securing networks.

Navy and Army veteran with a computer science degree and hands-on experience in firewalls, servers, and vulnerability assessment. I work in IT support and vulnerability scanning for managed clients, and I'm building toward network and systems engineering roles.

GitHub LinkedIn
9 years
of military service in the Navy and Army
99% uptime
across 84 enterprise servers on 2 networks in the Navy
4 certifications
including Security+ and PenTest+
About

From ship networks to client environments

I spent six years in the Navy as an Information Systems Technician, maintaining enterprise servers, core network equipment, backups, and secure communications, including deploying five VoIP systems. I then served three years in the Army as a Staff Sergeant, leading a team of six and keeping more than $4M of mission-critical equipment accounted for and maintained.

I finished a B.S. in Computer Science at UTSA in December 2024 and earned Security+, PenTest+, CNVP, and HITRUST CCSFP. Day to day I handle help desk and remote hands support and run vulnerability scans for client environments. Earlier in the role I also maintained servers and a pfSense firewall.

Outside work I run a segmented home network and lab on OPNsense.

Networking
Network segmentation · Firewalls (pfSense, OPNsense) · VoIP · Tailscale · AdGuard DNS
Systems
Linux (Ubuntu) · Docker · Server updates and backups
Security
Vulnerability assessment · OpenVAS · Nuclei · Nikto · Metasploit
Scripting
PowerShell · Python (basic) · Bash (basic)
Projects
Home lab

Segmented Home Network & Lab

An OPNsense firewall on N100 hardware separates Main, IoT, and Lab networks with firewall rules. AdGuard on Ubuntu Server handles network-wide DNS filtering, and Tailscale provides remote access limited to tailnet devices. Switching and Wi-Fi run on a smart switch and a UniFi access point managed through a Cloud Key+.

OPNsense · AdGuard · Tailscale · Ubuntu Server
Open source

modular-installer

A dark-themed WPF winget installer and system updater in a single PowerShell script. Pick apps, install them with live streamed logs, update apps and Windows, and build the whole thing into a double-click .exe.

PowerShell · WPF · winget
View on GitHub
Experience
Mar 2025 – Present
Jr. Penetration Tester / Helpdesk Technician
Holt Data Solutions

Help desk and remote hands support, vulnerability assessments for client environments, and support for new server deployments. Earlier in the role: server and pfSense firewall maintenance.

2018 – 2021
Staff Sergeant, Section & Operations Supervisor
United States Army

Led a team of 6 operators, ran training and audit programs, and kept mission-critical electronic defense systems valued at over $4M accounted for and maintained.

2008 – 2014
Information System Technician (IT2)
United States Navy

Kept 84 enterprise servers at 99% uptime across 2 networks, maintained 94 switches, routers, and backbones, and deployed 5 enterprise VoIP systems.

Credentials
B.S. in Computer Science
The University of Texas at San Antonio · December 2024
CompTIA Security+
CompTIA PenTest+ ce
CompTIA CNVP
HITRUST CCSFP
Google Cybersecurity Certificate
Cisco Intro to Cybersecurity
Hack The Box Penetration Tester path · in progress
Contact

Get in touch

The best way to reach me is on LinkedIn. My code is on GitHub.

LinkedIn GitHub
© 2026 Mark Smith · El Paso, TX