Rinaldo Castillo

IT & Field Service Specialist

Rinaldo Castillo

IT professional with 15+ years resolving hardware, software, and network issues across enterprise, clinical, and retail environments — including phone-based helpdesk, onsite field service, and enterprise deployment. CompTIA A+ certified with a consistent track record of first-call resolution and calm, precise support under pressure.

What I Do

Helpdesk & Remote Support

Phone-based and remote desktop support for Windows 10/11, Active Directory, MS Office 365, and VPN — with consistent first-call resolution across enterprise and clinical environments.

Network Infrastructure

Configuration and deployment of Cisco Meraki switches, access points, Palo Alto GlobalProtect firewalls, and VLAN infrastructure — across 20+ enterprise office and retail site builds.

Field Service & Deployment

On-site installation, calibration, and troubleshooting of enterprise hardware — POS systems, clinical diagnostic imaging equipment, and full office infrastructure — across the East Coast.

Device Management & MDM

JAMF administration for Mac fleet management, MDM provisioning, policy enforcement, and device imaging across multi-OS enterprise environments using Intune and Active Directory.

Resume

15+ Years of Experience

Experience

2021 – 2026
TD Synnex NY, NJ, CT Tri-State Area
Advanced Field Engineer / Service Desk Contractor

Delivered enterprise IT field support across 50+ client sites — law firms, retail chains, and data centers — achieving 95%+ first-contact resolution and eliminating escalations while managing full SLA compliance.

  • Resolved 95%+ of assigned incidents at first-contact across 50+ enterprise client sites including law firms, retail chains, and data centers — eliminating escalations and reducing client downtime.
  • Configured and deployed POS systems, Cisco Meraki switches, Palo Alto GlobalProtect firewalls, and VLAN infrastructure during 20+ new store and office setups across the tri-state area.
  • Managed a rolling queue of service requests using Salesforce, ServiceMax, and TrueContext — maintaining accurate case documentation, daily driving logs, mileage reports, and SLA compliance.
  • Performed remote desktop (RDP) and phone-based troubleshooting for connectivity, performance, and application issues on Windows 10 laptops, desktops, and peripheral hardware.
  • Supported JAMF-managed Mac fleet at Procore Inc. (Wall St, NY), resolving 30+ user issues weekly via JIRA and provisioning loaner devices, peripherals, and MDM-enrolled endpoints.
  • Maintained and submitted detailed expense reports covering mileage, fuel, and travel-related costs; recovered and tracked parts packages daily from FedEx Ground locations.
  • Installed, deinstalled, and replaced enterprise networking hardware — Meraki APs, switches, Palo Alto firewalls — and oversaw software updates, firmware upgrades, and IT infrastructure documentation.
2024 – 2026
TD Synnex Nationwide
Field Service Engineer – Philips Digital Pathology (Contract)

Reduced scanner downtime across high-volume clinical labs by installing and calibrating Philips Ultrafast and SG300 diagnostic imaging systems — traveling extensively across NY, NJ, CT, PA, MD, and VA.

  • Reduced scanner downtime in high-volume clinical labs by performing on-site installation, calibration, and rapid troubleshooting of Philips Ultrafast and SG300 diagnostic imaging systems.
  • Traveled extensively across the East Coast — including NY, NJ, CT, PA, MD, and VA — via both flights and long-distance driving to meet client SLAs and deployment schedules.
  • Coordinated multi-state service schedules independently, managing flight bookings, overnight stays, and vehicle travel to ensure timely on-site support for clinical laboratory clients.
  • Delivered technical training to laboratory staff on proper scanner operation, improving self-sufficiency and reducing repeat support calls by an estimated 30%.
  • Conducted hardware and software calibrations to maintain high-quality clinical diagnostic imaging standards across all client laboratory environments.
  • Documented all service activity in Salesforce and ServiceMax, ensuring full case traceability and audit-ready reporting for clinical compliance requirements.
2022 – 2023
TD Synnex (Contractor for Procore Inc.) Wall Street, New York, NY
IT Support / Helpdesk

Provided JIRA-based helpdesk support and JAMF Mac fleet administration for a fast-paced financial district office — managing hardware, access control, and infrastructure refreshes across a multi-OS environment.

  • Provided IT helpdesk support through a JIRA ticketing system, troubleshooting and resolving hardware, software, and access issues for office employees in a fast-paced financial district environment.
  • Assisted with network hardware installation and configuration including switches and access points, ensuring seamless connectivity across the office environment.
  • Managed IT inventory, provisioning loaner devices, peripherals, and accessories; maintained accurate records of equipment issued and returned by office patrons.
  • Supported JAMF administration for Mac device management, policy enforcement, and MDM provisioning across a multi-OS office fleet.
  • Installed, deinstalled, and replaced Cisco Meraki switches, Meraki access points, and Palo Alto GlobalProtect firewalls as part of scheduled IT infrastructure refresh projects.
  • Utilized Google Workspace and Microsoft 365 to manage collaboration, access control, and productivity tools across the office environment.
2013 – 2014
Unisys Technical Resources NY, NJ, CT
Dell Driving Field Technician

Resolved 25+ desktop, laptop, and printer issues weekly across corporate, business, and residential client sites — managing up to 200 miles of daily travel with full administrative accountability.

  • Resolved 25+ desktop, laptop, and printer issues weekly across corporate, business, and residential client sites while managing up to 200 miles of daily travel.
  • Maintained a detailed daily repair and replacement parts list; recovered and tracked hardware packages daily from FedEx Ground locations to ensure uninterrupted service delivery.
  • Accurately maintained daily driving and mileage logs as well as client service orders, ensuring full administrative accountability for each dispatched visit.
  • Assisted financial institutions and office personnel with hardware and software problems, providing hands-on troubleshooting and owning desktop and network issues through to full resolution.
2008 – 2013
Best Buy Bronx, NY
Geek Squad Assistant Supervisor

Performed 100+ hardware and software repairs per week while supervising a 7-person service team — training 20+ technicians and managing high-volume customer escalations in English and Spanish.

  • Performed 100+ hardware and software repairs per week while supervising a 7-person service team — maintaining throughput and quality across a high-volume retail service desk.
  • Managed all incoming calls and customer escalations; resolved 25+ customer issues daily via in-person and phone triage, offering repair, return, or replacement solutions in English and Spanish.
  • Trained 20+ new technicians and computing sales associates on IT support procedures, diagnostic tools, and customer-facing communication standards.
  • Created detailed and meticulous support service tickets for entry into the repair queue, improving accuracy and handoff efficiency across the service team.
  • Troubleshot Windows, macOS, iOS, and Android systems — OS reinstalls, virus removal, hardware diagnostics, and software configuration — for walk-in and scheduled clients.

Education

2008
PerScholas Institute Bronx, NY
CompTIA A+ IT Technician Certification

Completed 200+ hours of hands-on technical training covering networking, hardware, software, security, server infrastructure, virtualization, and mobile devices. Certified July 2008.

  • 200+ hours of structured coursework and lab training at PerScholas Institute, Bronx, NY.
  • Curriculum covered networking fundamentals, hardware repair, OS support, security, server management, virtualization, and mobile device support.
  • CompTIA A+ certification earned July 2008 — foundational credential for IT support and field service professionals.
2006
EOC – Equal Opportunity Center Bronx, NY
GED Diploma

General Educational Development diploma completed October 2006 at the Equal Opportunity Center, Bronx, NY.

Certifications

CompTIA A+ IT Technician
PerScholas Institute · Bronx, NY
July 2008 · 200+ Training Hours

Languages

🇺🇸
English
Native Proficiency
Full professional fluency · Customer support & technical communication
🇵🇷
Spanish
Native Proficiency
Full professional fluency · Bilingual client support & staff training

Support & OS Skills

Windows 10/11 & Active Directory95%
Microsoft 365 & Google Workspace95%
macOS & JAMF MDM85%
JIRA / Salesforce / ServiceMax90%
VPN / RDP / Remote Support90%

Networking & Hardware

Hardware Repair & Field Service95%
Device Imaging & Deployment90%
Cisco Meraki & VLAN Config85%
Palo Alto GlobalProtect / VPN85%
Printer Support (Local & Network)90%