David Tobar
IT professional with 18+ years across server administration, cybersecurity, and network infrastructure — for city government, healthcare, and private-sector clients alike. Based in Key West, FL.
Hands-on experience, steady under pressure.
Over 18 years in IT, I've built a career on solving complex problems calmly — from hospital desktop fleets to city network infrastructure to cybersecurity operations for a public utility.
My background spans server and network administration, cybersecurity monitoring and hardening, virtualization, and automation — most recently as a Server Administrator / Cybersecurity Administrator for the Florida Keys Aqueduct Authority, following several years managing IT for the City of Key West and running my own IT consulting practice.
I'm comfortable owning a problem end-to-end: diagnosing the issue, implementing a fix, and documenting it clearly so the next person isn't left guessing. Fluent in English and Spanish.
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Security-focusedSIEM monitoring, vulnerability assessments, and layered defenses.
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Infrastructure & virtualizationServer hardware, VMware ESXi, backup & recovery systems.
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Automation-mindedPowerShell & shell scripting to cut manual work and human error.
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Government & enterprise experienceCity of Key West, NYC Health + Hospitals, and public utility environments.
Technical toolkit.
Built up across two decades of hands-on systems, network, and security work.
Operating Systems
Infrastructure & Virtualization
Security
Tools
Scripting / CLI
Hardware
CompTIA Security+ — 2025
University of Miami — Miami, FL
Cybersecurity Professional Certificate — 2021
Katharine Gibbs School — New York, NY
Associate of Occupational Studies — Computer Networking Operation
Katharine Gibbs School — New York, NY
Languages
English & Spanish — Fluent
Where I've worked.
Sixteen years across public utilities, city government, healthcare, and private consulting.
- Built and maintained backup and recovery procedures to protect data integrity across mission-critical systems.
- Implemented multi-layered security measures, including intrusion detection and encryption, to guard against cyber threats.
- Monitored network traffic and system logs (SIEM) for anomalous activity, running regular vulnerability and risk assessments.
- Managed installation, configuration, and maintenance of server hardware and software, including integrating new servers into the environment.
- Automated backup rotation and log management with Linux shell and PowerShell scripts, reducing manual intervention.
- Designed, configured, and maintained network firewalls using pfSense to strengthen client cybersecurity.
- Deployed Network Attached Storage (NAS) solutions to streamline data storage and accessibility.
- Configured and deployed VMware ESXi virtualization environments for clients.
- Installed and configured OBS and live-streaming hardware to support business communication and engagement.
- Diagnosed and restored Point of Sale (POS) system connectivity to keep client operations running.
- Oversaw network infrastructure at City Hall and satellite offices, including the Fire Station, Police Department, and Marine Ports.
- Configured, troubleshot, and deployed network equipment for the city's communication infrastructure.
- Monitored and maintained virtual servers via VMware vSphere ESXi.
- Tuned configurations on document archiving and workflow servers to improve efficiency.
- Managed Active Directory user accounts and responded to SIEM alerts in ManageEngine Log360.
- Implemented Barracuda Email Protection and used Carbon Black Endpoint Protection to contain and secure compromised devices.
- Provided installation, configuration, and troubleshooting support for all on-site city software.
- Supported document workflow through Frevvo and FileBound software.
- Resolved staff calls, emails, and tickets through ManageEngine Service Desk Plus.
- Supported the City Financial Department's use of OneSolution software.
- Maintained City equipment inventory with ManageEngine Desktop Central.
- Troubleshot Microsoft Office 365 and provided email and Active Directory account support.
- Assisted Key West residents and business owners via phone, email, and Land Management Software tickets.
- Coordinated activities to meet Workplace Computing Group service level objectives.
- Worked with the WCG team to enforce standardized operating procedures enterprise-wide.
- Supported deployment of territory-specific projects aligned with facility needs.
- Contributed to initiatives on facility contracting, payment policies, vendor transitions, and product design changes.
- Identified pooled technical resource needs ahead of demand across assigned facilities.
- Managed the full lifecycle of Dell workstations — installation, configuration, testing, upgrades, monitoring, and troubleshooting.
- Managed hardware and software inventory and procurement.
- Collaborated with technicians and network administrators to keep the desktop computing environment running smoothly.
- Worked with Nursing and Respiratory teams to resolve software issues involving ventilator-monitoring Bernoulli devices.
- Assessed nursing stations for hardware needs, particularly medication carts.
- Supported critical clinical software including Quadramed, Clinivision, CBORD, and the Nurse Call Responder System.
Interested in working together?
Open to new opportunities and consulting work — send a message and I'll follow up.