JRG.
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Open to new opportunities

John R.
Gallagher

Network Security Engineer / Software Developer / AI Agent & Infrastructure Specialist / RF / SDR & Avionics

15+ years securing enterprise network infrastructure — firewalls, IDS/IPS, VPN, Active Directory, vulnerability assessment — extended into RF, OSINT, and hardware attack surface.

Download résumé Email (832) 224-1001 Kingwood, TX

Hiring for — pick a role to reorder this page

15+ yrs
Network security & infrastructure
Firewalls, VPNs, Active Directory, and audits for SMBs and enterprise networks since 2009.
0 inbound ports
Self-hosted production stack
Docker, Postgres, Nginx/Certbot and a Tailscale mesh I run and administer myself — no managed hosting in the path.
6 systems
Built end to end, shipped
Analytics platform, SEO toolkit, ADS-B tracker, RF firmware, OSINT dashboards, market engines — plus 8 client sites.
MCSE
A+ · Citrix · MCP certified
AAS
Network Administration

Targeting

Network Security Engineer · DevOps / Infrastructure · Full-Stack Engineer

Work mode

On-site (Houston metro) · Hybrid · Remote

Authorization

US work authorized — no sponsorship required

Live from GitHub

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Profile

01 — Section

Skills & Stack

Ordered for Network Security roles — most relevant areas first.

Network Security

01

core for network security

  • Firewall, IDS/IPS, VPN, Tailscale
  • Active Directory & Domain Admin
  • Cisco, VLANs, Subnetting, BGP/OSPF
  • Vulnerability assessment & audits

RF & Hardware Security

03

core for network security

  • SDR: RTL-SDR, HackRF + PortaPack
  • Sub-GHz protocol reverse engineering
  • Embedded C firmware, ESP32, CC1101
  • Drone SiK radio & MAVLink telemetry

OSINT & Threat Intel

04

core for network security

  • OSINT collection & dossier workflows
  • Subdomain enum & recon automation
  • AI-assisted pentest tooling (local LLM)
  • Geospatial infrastructure mapping

Avionics & Aviation

08

core for network security

  • Avionics installation & bench testing
  • Pitot-static system certification
  • ADS-B receiver builds, tracking & SDR analysis

Software & DevOps

02
  • Full-stack web & API integration
  • Docker, Postgres/Supabase, Nginx
  • VPS (Linux/Ubuntu), Certbot SSL
  • Python, C/C++, TypeScript, Git

AI Agents & Systems

05
  • OpenClaw + Claude Code agent workflows
  • Agent skills, plugins & task pipelines
  • Prompt engineering & agent evaluation
  • Self-hosted local AI infrastructure

Web Development for Business

06
  • Marketing sites for local service businesses
  • React/TypeScript, Vite, Tailwind, SSR
  • Local SEO, schema markup, Core Web Vitals
  • Deployment on Vercel, VPS, and Cloudflare

Markets & Quant Tooling

07
  • Crypto & equity sentiment pipelines (Python)
  • Cross-venue arbitrage scanning
  • Prediction markets: Polymarket, Kalshi
  • PineScript indicators & portfolio risk

Certifications

06
MCSE (Microsoft Certified Systems Engineer)CompTIA A+Citrix Certified ProfessionalMCP

Continuous learning

Penetration TestingSDR & RF Protocol AnalysisOSINT & Threat IntelligenceAI Agent Systems (OpenClaw, Claude Code)Cloud & Self-Hosted Infrastructure

02 — Section

Selected Projects

Systems I designed, built, and self-hosted end to end — most relevant to Network Security first, each with a full case study.

SDR / Embedded Firmware

RF & Hardware Security Lab

Sub-GHz protocol research and custom embedded firmware — SDR capture, decode, and replay across real-world radio hardware.

Sub-GHz
Capture, decode, controlled replay
Embedded C
Firmware written, not just flashed
4 rigs
HackRF, CC1101, ESP32, RTL-SDR
  • ProtoPirate22 — embedded C firmware for sub-GHz protocol work
  • AVsassSDR — aviation SDR / ADS-B signal testing tooling
  • HackRF + PortaPack, CC1101, and ESP32 based capture and transmit rigs
  • Drone SiK radio detection and MAVLink telemetry analysis
CHackRFCC1101ESP32RTL-SDRMAVLink
Case study

Open-Source Intelligence

OSINT & Intel Dashboards

Collection and analysis tooling that turns scattered public data into a single monitored picture.

Local LLM
Reasoning layer, zero API cost
0 bytes
Query data sent to third parties
Name → dossier
Automated collection to scored report
  • Real-time global intelligence dashboards for news, markets, and geopolitical events
  • Infrastructure mapping from open geospatial data
  • Recon automation: subdomain enumeration and asset discovery with local LLM analysis
  • AI agent skills that take a target from a name to a scored dossier
PythonTypeScriptOllama / local LLMOSM dataScrapers
Case study

Aviation & Infrastructure Networking

ADS-B Flight Tracker

Self-hosted flight tracking stack with custom visualization and mesh networking across every node.

1090 MHz
Live ADS-B decoded on-site
0
Inbound firewall ports opened
Pi Zero 2 W
Receiver footprint, OLED health display
  • Web-based flight tracker with amber CRT-style visualization for local ADS-B coverage
  • Raspberry Pi Zero 2 W ADS-B receiver with SSD1306 OLED display
  • Tailscale mesh across VPS, home network, and ADS-B devices via subnet router pattern
  • One-script receiver setup that publishes to multiple flight-tracking networks
SDRRTL-SDRRaspberry PiTailscaleLinuxWeb UI
Case study

Crypto Analytics Platform

Frameworx

Multi-source crypto analytics platform aggregating market, on-chain, prediction-market, and social signals into one analysis surface.

5
External data sources unified
1 VPS
Entire stack, one compose file
Nightly
Off-box backups with restore drills
  • Integrated CoinGecko, TokenMetrics, DefiLlama, Polymarket, and ScrapingDog/X feeds
  • AI ensemble analysis, real-time WebSockets, and geopolitical risk overlays
  • Migrated backend from Supabase Cloud to self-hosted Docker on a Hostinger KVM2 VPS
  • Configured Nginx/Certbot SSL, Cloudflare DNS, and automated Postgres backups
DockerPostgresWebSocketsNginxCloudflareAI ensembles
Case study frameworx.site

Local SEO Toolkit

SEO Tracker

Dockerized toolkit for local search visibility, built on a dedicated Postgres instance.

Geo-grid
Rank sampled per coordinate, not once
Dedicated
Postgres instance, isolated in Docker
NAP
Citation consistency checked automatically
  • Geo-grid map-pack rank tracking across coordinate grids
  • Google Business Profile metrics ingestion
  • NAP citation consistency checks
DockerPostgresGoogle APIsPythonGeo-grid
Case study

Quant / Prediction Markets

Market Signal Engines

Sentiment pipelines, arbitrage scanners, and prediction-market tooling for crypto and equities.

Cross-venue
Arbitrage spreads compared per cycle
2 markets
Polymarket and Kalshi as signal feeds
Backbone
Became the data layer under Frameworx
  • Python sentiment pipelines scoring equities and crypto from social and news text
  • Cross-venue futures arbitrage scanner surfacing spread opportunities
  • Polymarket / Kalshi prediction-market data and strategy tooling
  • Custom PineScript indicators used in live technical workflows
PythonPineScriptPolymarket APIKalshiPostgres
Case study

03 — Section

Client Work & Web Builds

Sites designed, built, and deployed for local businesses across the Houston area.

Lonestar Aircraft Service

Marketing site for an avionics and aircraft service shop

ReactTypeScriptVercel
Visit site

HTX Data Recovery

Service site for a Houston data recovery business

ReactTypeScriptLocal SEO

Kingwood Data

IT services site with service-area and contact funnels

ReactTypeScriptLocal SEO

Atascocita IT

Revamp of an existing managed-IT provider site

HTMLCSSRebuild

Kings Park IT

Fast static site for a local IT shop

Static HTMLPerformance

TrueHH

Small-business web presence build

ReactTypeScript

TX Birding

Regional interest site with mapped location data

ReactMapsContent

TX Stick

Flight school site and landing pages

ReactTypeScript
Visit site

Source repositories for client builds are private. Live links shown where the site is published.

04 — Section

Infrastructure & Homelab

Everything on this page runs on infrastructure I administer myself — one VPS, a Tailscale mesh, and hardware on my own bench.

Topology

        [ Cloudflare DNS ]
                │
        [ Nginx + Certbot ]
                │
   ┌──── Docker Compose (KVM2 VPS) ────┐
   │  Postgres · APIs · workers        │
   └───────────────┬───────────────────┘
                   │  Tailscale mesh (no inbound ports)
       ┌───────────┼───────────────┐
       ▼           ▼               ▼
  [ home LAN ]  [ Pi ADS-B ]  [ local AI / RF bench ]

Hostinger KVM2 VPS

Docker Compose host: Postgres, APIs, workers. Nginx TLS with Certbot renewals, Cloudflare DNS in front.

UbuntuDockerNginxPostgres

Tailscale mesh

WireGuard-based tailnet joining VPS, home LAN, and field devices. Subnet router exposes the LAN with zero inbound ports open.

WireGuardSubnet routerACLs

Raspberry Pi ADS-B node

Pi Zero 2 W with RTL-SDR decoding 1090 MHz, OLED health display, feeding the tracker and public networks.

RTL-SDRRaspberry Pisystemd

Local AI + RF bench

Self-hosted local models for OSINT and agent workloads, plus HackRF/CC1101/ESP32 rigs for sub-GHz work.

OllamaHackRFESP32

05 — Section

Experience

  1. Avionics Installer

    Jan 2026 – Jun 2026

    Lonestar Aircraft Service

    • Performed avionics installations on general aviation aircraft
    • Conducted pitot-static system testing and certification checks
    • Applied precision troubleshooting and technical documentation to aircraft systems

  2. Lead Technician

    2024

    Kingwood IT · Kingwood, TX

    • Managed a team of technicians and oversaw day-to-day technical operations
    • Provided advanced on-site support across Apple and multi-platform environments
    • Resolved complex hardware and software issues while maintaining high customer satisfaction

  3. Computer & Mobile Device Repair Specialist

    2022 – 2024

    Simply Honest Mobile · Kingwood, TX

    • Advanced hardware repairs, component-level diagnostics, and custom modifications
    • Critical data recovery and secure data migration for business and personal clients
    • On-site support and circuit-board level troubleshooting

  4. Web Developer & Web3 Consultant

    2019 – 2024

    Self-Employed · Remote

    • Designed, built, and deployed marketing and service sites for local Houston-area businesses
    • Consulted on Web3 projects, smart contract implementations, and blockchain integrations
    • Cryptocurrency market analysis and custom PineScript trading indicators
    • Advised clients on portfolio diversification and risk management

  5. Network Technology Consultant

    2012 – 2017

    Self-Employed · Remote

    • Designed and implemented secure network infrastructures (firewalls, VPNs, access controls) for SMBs
    • Network audits, vulnerability assessments, and ongoing IT security contracts

Earlier experience

Network Administrator — Chemtran USA (2009–2012) & Kingwood Dental Care (2003–2012) · Database Administrator & Web Solutions — 1dayEbiz/Dealer-Made (2005–2008) · IT/Network Technician — Net-Tech Services (2005)

06 — Section

Writing

Notes on the systems I build — infrastructure, security, and AI agent workflows.

July 28, 2026 · 6 min read

Migrating Frameworx from managed Postgres to self-hosted Docker

Why I moved the Frameworx backend onto a Hostinger KVM2 VPS, and the Nginx, Certbot, and backup setup that keeps it boring.

Read post

June 14, 2026 · 5 min read

A Tailscale mesh that ties my VPS, home lab, and ADS-B nodes together

Subnet routers, tagged devices, and least-privilege ACLs — how I reach every box without exposing a single inbound port.

Read post

May 2, 2026 · 4 min read

How I actually ship with AI agents

Agents are great at scaffolding and terrible at judgment. Here is the workflow I use to keep the speed without the mess.

Read post
All posts

07 — Section

Résumé & Contact

Full résumé (PDF)

Complete work history, certifications, and technical competencies — ready to view or download.

Download résumé spinets-twist-0v@icloud.com

Education

Associate of Applied Science — Network Administration

North Harris Montgomery Community College · 2004