Cloud & Microsoft 365
- Microsoft 365 Admin
- Exchange Online
- SharePoint
- Teams
- Azure AD
- Cloud Migration
- IaaS
Houston, TX · IT & Cybersecurity
Jonathan Castro
IT Technician → Director of IT
I run the entire technology backbone of an 82-person company — security, cloud, automation, and the apps that hold it all together.
- 0Years sole IT ownership
- 0Users supported
- 0Cloud migrated
- 0Projects built
01 — About
The one-person IT department.
I'm Jonathan — the entire IT department at Final Expense Direct, a life-insurance company in Houston. For nearly nine years I've owned every layer of the stack: the network, the servers, Microsoft 365, the phone system, the CRM, security, and the help desk.
The last four years I've run all of it solo, after years working alongside the company's Director of IT. When something doesn't exist yet, I build it — automations, dashboards, internal web and desktop apps, even AI agents that handle calls and qualify leads.
I'm currently finishing a Master of Science in Cybersecurity (GPA 3.73) — and I do all of this while raising my daughter full-time. I like hard problems, clean systems, and shipping things that actually work.
02 — Skills
A deep, hands-on toolkit.
Built over a decade of being the person everything lands on.
Cybersecurity
- MFA & RBAC
- Firewall / VPN
- Vulnerability Scanning
- IDS / IPS
- Incident Response
- Forensics
- NIST CSF 2.0
- CMMC / 800-171
- SSL/TLS
Automation & Integration
- Power Automate
- Microsoft Graph API
- Zapier
- Webhooks
- GoHighLevel
- SuiteCRM
- Workflow Design
Networking & Telephony
- Network Administration
- Network Security
- DNS Management
- Nginx / Reverse Proxy
- VoIP
- ViciDial
- Twilio
Servers & Systems
- Windows Server
- Debian Linux
- Kali / BackBox
- Dell PowerEdge
- Backup & Recovery
- SFTP / Remote Access
Development & Scripting
- Python
- PowerShell
- HTML / CSS / JS
- WordPress Development
- Electron
- SQL
03 — What I Build
If it doesn't exist, I build it.
Cloud & Infrastructure Migration
Moving entire companies off on-prem and into the cloud — phone systems, CRMs, file storage, and 80+ users — with zero downtime.
Cybersecurity & Network Defense
Hardened Linux servers, intrusion detection, honeypots, automated banning, and dashboards that watch the network in real time.
Automation & Systems Integration
Power Automate + Graph API flows, Zapier pipelines, and webhook integrations that wipe out repetitive manual work.
Web Development & Design
Fast, modern, responsive sites — from WordPress business builds to hand-coded portfolios and creative fan sites.
Custom Apps & Desktop Tools
Internal web apps and full Electron desktop applications that solve problems no off-the-shelf product does.
Data Analysis & Dashboards
Turning messy call-center and sales data into clean reports, pivots, and interactive dashboards that drive decisions.
AI Agents & Custom Tooling
Voice and chat AI agents for lead handling and qualification, plus custom tooling that automates my own workflows.
04 — Featured Projects
A few things I've shipped.
Real work, described at a high level — no client data shown.
Security
Network Security Monitor
Real-time network defense: Suricata IDS, a honeypot, automated IP banning, and a live dashboard for traffic and threats.
Security
Debian Server Hardening Suite
End-to-end lockdown of a Debian server — firewall rules, monitoring, log parsing, and automated reporting.
Apps
Insurance Underwriting App
A web and Electron desktop app that matches clients to carriers using digitized underwriting guides.
Apps
IT Help-Desk Bot
A Microsoft Teams tab app that answers common IT questions and triages help-desk tickets for staff.
Apps
Study & Education App
A custom study application with an admin back-end and a guided, student-friendly user experience.
Automation
Teams Recordings → SharePoint
A Power Automate + Graph API flow that auto-centralizes every Teams meeting recording into SharePoint.
Automation
CRM Lead-Sync
Real-time, two-way lead syncing between GoHighLevel and SuiteCRM via webhook automation — no more manual entry.
Data
Call-Center Analytics
Campaign and conversion analysis on dialer data — agent and vendor performance, funnels, and capacity math (fully anonymized).
Web
Insurance Rate-Quote Engine
An in-house quote engine that prices burial-insurance plans across multiple carriers, replacing a third-party tool.
Web
Creative Web Builds
A range of sites — an author/manuscript site, anime fan sites, and a local business site — each with its own custom look.
AI
Voice & Chat AI Agents
Conversational AI that handles inbound calls and pre-qualifies leads — built on a CRM voice platform with custom prompts and logic.
AI
Custom AI Skills
Authored reusable AI workflow skills — project memory, an automated website builder, and a call-flow analyzer.
05 — Education
Sharpening the edge.
M.S. in Cybersecurity
In progressCoursework: Risk Management, Information Security Governance, Incident Response Planning, NIST CSF 2.0, CMMC / NIST 800-171 Compliance, Cyberterrorism, and Healthcare Cybersecurity.
B.S. in Cybersecurity
CompletedFoundations in security architecture, networking, systems administration, and risk — the groundwork behind everything on this page.
06 — Contact
Let's build something.
Got a project, a role, or a problem that needs solving? Reach out directly.
Email me