Carlos Castro

Managed and maintained Public Key Infrastructure (PKI) and digital certificates across Windows Server environments using Active Directory Certificate Services (ADCS) and GlobalSign Public CA. Administered security protocols utilizing OpenSSL, RSA, ECC, and FIPS-compliant cryptographic hardware devices.

Engineered core networking environments across vSphere and ESXi virtualized platforms. Designed and deployed network configurations utilizing Distributed Switches and Standard Switches.

Delivered Tier 2 global customer service and technical support for Palo Alto Networks Next-Generation Firewalls. Troubleshooted complex enterprise network security issues involving firewall policies, routing, and configurations.

Provided Tier 2 infrastructure and application support to global enterprise clients utilizing Skype for Business. Diagnosed infrastructure issues related to SIP signaling, Voice over IP (VoIP), and Unified Communications.

Provided direct technical and transactional support to customers to resolve service-related concerns.

Engineered security policies, NAT methods, and zone-based firewalling configurations on Juniper devices. Handled L4 port filtering, DNS, DHCP, and resolved site-to-site IPsec VPN and dynamic client VPN traffic issues.

Delivered multi-tenant helpdesk infrastructure support for a diverse portfolio of outsourced client corporations.

Administered helpdesk workflows for corporate and medical customers located across the USA and Canada. Troubleshot TCP/IP network connectivity, wireless configurations, DHCP parameters, and proprietary 3D dental scanner hardware.

Provided outsourced technical service and infrastructure support for incoming client requests.

Managed enterprise monitoring systems specializing in HP Network Node Manager deployments.

Maintained internal office IT operations, endpoint devices, and software systems.

Provided IT infrastructure support for DHL Express employees located across the Caribbean Islands. Managed Active Directory objects, organizational units (OUs), group policies, NTFS file permissions, and domain access.

Maintained local business computing environments spanning Windows XP, Vista x64, and MS Office. Managed Active Directory access, print spoolers, fax servers, and proprietary tour planning reservation databases.

Monitored data center health through SNMP tools, creating tickets from active alarms and routing to global owners. Managed Active Directory password compliance and generated system metrics via Oracle SQL Developer.

Fielded customer service requests for laptop computers running Windows XP/Vista operating systems.

Discovered root-cause failures on HP ProLiant P-Class and C-Class server blades. Performed diagnostic evaluations on multi-channel HDD controllers spanning SCSI, ATA, SATA, and SAS setups under RAID 0/1/5.

Handled enterprise-level command line interface (CLI) configurations on Cisco PIX Firewalls. Built network maps and troubleshot Access Control Lists (ACLs), Static IP Routes, Syslogs, and NAT/NAT 0 variants.

Provided technical validation and consumer client hardware support for Toshiba electronics.

Currently enrolled in the AZ-104 certification course.

CompTIA Security+ certification valid from June 2024 to June 2027.

Juniper Networks Certified Internet Professional - Security (JNCIP-SEC) certified from 2017 to 2020.

Microsoft Certified Professional (MCP) certification from 2008 to 2009.

Completed IT Essentials I (A+ Certification Equivalent) in 2005.

Cisco Certified Network Associate (CCNA) certification from 2004 to 2007.

Completed Técnico En Redes (Network Technician) in 2003.