Ernesto Diaz
Assistant IT Manager
Grand Prairie, TX
Network engineer specializing in multi-site infrastructure and network automation, with hands-on ownership of SD-WAN, security, and monitoring across 80+ locations. Proven ability to design resilient network architectures, standardize deployments, and automate configuration management using Ansible and Git. Strong focus on scalability, uptime, and reducing operational overhead through automation and centralized control.
Skills & Technologies
Routing & Switching
SD-WAN
Cisco Meraki
Ruckus
Cradlepoint
Ansible
PowerShell
Bash
Git / GitHub
Intune
Jamf
NinjaOne
Action1
Experience
Assistant IT Manager Current
Pollo Regio
Sep 2022 – Present
Key Engineering Work
Network Standardization (80+ Sites).
Designed and deployed a standardized network architecture across all locations using Cisco Meraki and Cradlepoint, implementing SD-WAN with automatic WAN failover. Eliminated single points of failer and significantly improved network resilience across all sites.
PCI Network Compliance.
Designed and implemented network segmentation, firewall policies, and secure access controls to support PCI compliance across 80+ locations.
Monitoring & Observability Platform.
Deployed centralized monitoring using Zabbix, Prometheus, and Grafana, providing full visibility into network devices, WAN health, and infrastructure performance. Enable proactive alerting and reduced incident response time.
Security & Access Control Improvements.
Implemented MFA and conditional access policies for administrative access to network and infrastructure systems. Replaced password-only authentication and strengthened overall security posture.
Warehouse Infrastructure Design (55,000 sq ft x 2).
Architected and deployed full network infrastructure for two warehouses, including switching, wireless coverage, structured cabling, cameras, and endpoint systems for greenfield to production.
Hardware Standardization.
Analyzed ticket data to identify failing consumer-grade hardware, then led a company-wide swap to ruggedized commercial equipment. Saved an estimated $10K-$25K per year and cut recurring support volume.
Vendor Evaluation & Technical Leadership.
Evaluated and tested networking and infrastructure solutions in lab and production environments. Presented recommendations to leadership and drove adoption of standardized platforms.
Day-to-Day Responsibilities
Design and manage SD-WAN, firewall policies, VLANs, and wireless infrastructure.
Manage DNS and DHCP for all sites: scope setup, reservations, and troubleshooting.
Automate provisioning and configuration changes using Ansible and Git workflows.
Oversee backup and disaster recovery processes.
Lead and coordinate field technicians, including escalations and project execution.
Lead Technician
Feb 2023 – Sep 2023
Responsibilities
Coordinated field technicians across multiple concurrent site installations, serving as on-site lead and point of escalation.
Standardized physical infrastructure installs: rack layouts, cabling runs, AV and camera installs, and wireless deployments.
Handled on-site troubleshooting and configuration for network equipment, POS systems, and AV gear during new location builds.
Field Technician
Aug 2022 – Feb 2023
Responsibilities
Installed and configured network equipment, POS systems, cameras, AV gear, and cabling.
Troubleshot hardware and connectivity issues on-site, escalating to senior staff when needed.
Technical Support Specialist
Cyberlink ASP
Jan 2022 – Aug 2022
Core Responsibilities
Managed Citrix XenApp/XenDesktop environments including VDI, Exchange, SQL, and print servers for hosted clients.
Handled Fortinet firewall administration: policy management, VPN troubleshooting, and connectivity issues across client environments.
Provided Tier 2/3 support for hosted applications, resolving server-side and network issues.
Customer Service Supervisor
Walmart
Jan 2005 – Dec 2021
Core Responsibilities
Ran daily operations for the customer service department: scheduling, task assignments, performance tracking, and handling escalated issues for a team of 10.
Last updated on • Ernesto Diaz