David Rainear Jr

Systems Administrator / Tier 3 IT Specialist

Systems Administrator / Tier 3 IT Specialist with 5+ years supporting enterprise and manufacturing IT environments. Focused on Windows and Linux administration, endpoint management, identity/access control, VDI support, automation, and repeatable fixes.

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David Rainear Jr
5+
Years Experience
200+
Users Supported
Enterprise
IT Environments
Cisco
Certified

Professional Experience

IT Support Specialist – Tier 3
Resorts Casino – Atlantic City, NJ
March 2024 to Present
  • Administer Active Directory OUs, group policies, account lockouts, and access controls for 200+ users in a regulated casino environment.
  • Manage SCCM/Intune patching, OS updates, application deployments, imaging, and task sequences; remediate deployment failures.
  • Configure and troubleshoot Entra ID/Azure AD Conditional Access and MFA policies.
  • Diagnose Omnissa Horizon VDI issues including connection failures, profile corruption, GPO conflicts, and disrupted sessions.
  • Automate recurring endpoint remediation with PowerShell and Batch scripts.
  • Own evening outage response, coordinate escalations, document repeatable fixes, and support infrastructure tasks.
IT Technician – Tier 2 Support
Universal Mold & Tool, INC. – Vineland, NJ
January 2021 to March 2024
  • Supported manufacturing IT operations across Windows endpoints, printers, mobile devices, business applications, and network connectivity.
  • Installed, configured, patched, and maintained operating systems, applications, desktops, printers, and mobile devices.
  • Managed Active Directory accounts, group memberships, and permissions while resolving endpoint, software, printer, and connectivity issues.

Technical Skills

🖥️ System Administration

  • Windows administration and endpoint support
  • Linux administration
  • Active Directory: OUs, GPOs, account lockouts, permissions
  • Microsoft Entra ID/Azure AD: Conditional Access, MFA
  • Endpoint Provisioning & Configuration
  • Omnissa/VMware Horizon VDI troubleshooting

🔒 Security & Access Control

  • Identity and access control
  • MFA and Conditional Access
  • Linux hardening
  • SSH keys and Fail2ban
  • Firewall rules
  • Log analysis

⚙️ Automation & Endpoint Management

  • SCCM/MECM and Intune: MDM, patching, imaging
  • PowerShell and Batch automation
  • Patching and application deployments
  • Imaging and task sequences
  • Crontab maintenance and scripted updates

🌐 Networking & Infrastructure

Credentials

Education

  • Bachelor of Science in Computer Science & Information Systems - Stockton University

Certification

Training

  • TryHackMe Cybersecurity Labs: Linux, networking, threat detection, log analysis, and SOC workflows

Personal Projects

Liar's Dice for Playdate

Designed, tested, and published a Playdate adaptation of Liar's Dice under Sw00d Games with UI/UX systems, pass-and-play multiplayer, player statistics, website integration, and public distribution workflows.

Playdate Game Dev itch.io Liar's Dice
Play on itch.io View Liar's Dice Page

Self-Hosted Security Stack

Deployed Pi-hole, Unbound, WireGuard, and dynamic DNS on Raspberry Pi for DNS filtering and encrypted remote access.

Pi-hole Unbound WireGuard Raspberry Pi

Linux Hardening & Automation

Implemented SSH keys, Fail2ban, firewall rules, Crontab maintenance, and scripted updates across Raspberry Pi OS and Debian.

SSH Fail2ban Crontab Debian

Let's Connect

Systems administrator focused on reliable infrastructure, endpoint management, identity/access control, VDI support, and automation.

📧 Email 📞 Call

📍 Based in Estell Manor, NJ. Targeting roles in Phoenix, Arizona; Charlotte, NC; and Charleston, SC.

Not considering: California, New York, Pennsylvania.