Jonathan Parker Brazell
Security & Infrastructure Specialist
Lexington,SC
Summary
Security-focused infrastructure engineer with hands-on experience across incident response, identity security, network defense, and enterprise infrastructure. Background includes firewall administration, VPN security, PKI, Active Directory, SIEM monitoring, and vulnerability remediation across production environments. Strong troubleshooting and analytical skills with experience identifying, investigating, and resolving complex security and authentication issues.
Overview
3
3
years of professional experience
2
2
Certifications
Work History
Network Engineer
Sumter County Government
Sumter, SC
03.2026 - Current
- Environment: Fortinet, SSL-VPN, SAML/Entra, Active Directory, PKI, DNS, NAT
- Designed and implemented enterprise PKI infrastructure supporting certificate-based authentication and strengthened identity security across the environment.
- Developed and documented secure authentication and provisioning procedures for enterprise certificate-based access deployment.
- Administered and secured multi-site Fortinet infrastructure, including firewall policy management, segmentation, VPN security, and access control enforcement.
- Implemented secure remote access architecture using SSL-VPN and SAML/Entra integration with segmentation and least-privilege access controls.
- Identified and remediated security misconfigurations, including firewall exposure, weak authentication controls, and insecure access configurations.
- Investigated and resolved complex network, authentication, and secure access issues across production environments.
Endpoint Technician
South Carolina Department of Public Health
Columbia, SC
11.2024 - 03.2026
- Investigated and resolved enterprise authentication and secure network access issues, including 802.1X failures and endpoint connectivity problems.
- Diagnosed and resolved infrastructure and security-related service failures impacting authentication, application access, and network connectivity.
- Coordinated with network and infrastructure teams to resolve cross-layer authentication, policy, and connectivity issues.
- Supported and improved Group Policy and system configurations across thousands of domain-joined systems
- Automated administrative and remediation tasks using PowerShell, improving consistency and reducing manual overhead
- Supported vulnerability remediation and secure configuration management across enterprise Windows systems.
- Provided endpoint support across a large-scale Windows enterprise environment supporting thousands of devices
- Assisted with troubleshooting network, authentication, and policy issues impacting user and system connectivity
- Supported Active Directory administration, including account management and group membership
- Participated in troubleshooting efforts involving network connectivity, authentication failures, and policy conflicts
Key Impacts
- Designed and deployed enterprise PKI infrastructure to support certificate-based authentication, reducing reliance on traditional credentials and strengthening access control
- Resolved enterprise-wide 802.1X authentication issues, restoring secure network access for endpoint devices
- Diagnosed and mitigated DNS resolution failures in environments lacking centralized filtering such as Cisco Umbrella
- Implemented segmented VPN architecture with controlled access to internal resources using firewall policy and web filtering
Education
Bachelors - Cybersecurity and Information Assurance
05.2026
In Progress
Skills
- Log analysis and investigation
- Vulnerability remediation
- Identity security and access control
- Security hardening
- PKI / certificate-based authentication
- Active Directory & Group Policy
- 8021X network access control
- SAML / Entra ID integration
- Least-privilege access
- Firewall administration (Fortinet)
- VPN technologies (SSL-VPN, IPsec)
- Network segmentation
- DNS, DHCP, NAT, and routing
- Packet analysis
- Splunk and Sysmon
- PowerShell automation
- Security monitoring
Websites
Certification
- Practical Network Penetration Tester (PNPT), TCM SECURITY, 2026-02-01, Completed full external-to-internal enterprise penetration test, achieved domain compromise, and defended findings in a report and live technical debrief.
- CompTIA Security+ (CE), COMPTIA, 2025-03-01
Projects
Enterprise Active Directory Assessment (PNPT)
- Performed full enterprise penetration test simulation involving external compromise, lateral movement, privilege escalation, and Active Directory exploitation.
- Identified and validated security weaknesses across network, system, and Active Directory environments.
- Delivered structured remediation recommendations aligned with NIST security guidance and best practices.
Security Operations & Active Directory Lab
- Built and administered a multi-host Active Directory environment with DNS, DHCP, and endpoint security tooling
- Configured routing, NAT, and firewall rules (pfSense) to understand segmentation and trust boundaries
- Implemented Group Policy configurations and privilege controls to model enterprise identity management
- Built and validated Sysmon and Splunk detections for credential access and post-exploitation techniques, including LSASS dumping and suspicious process activity.
Timeline
Network Engineer - Sumter County Government
03.2026 - Current
Endpoint Technician - South Carolina Department of Public Health
11.2024 - 03.2026
Western Governors University - Bachelors, Cybersecurity and Information Assurance