>_cronin/BOB CRONIN · STEALTHCAT
PERSONAL PROFILE / DEVELOPER

// CYBER OPERATIONS · SOFTWARE · SERVICE

BOB
CRONIN

Cyber Operations · Software Development · Technical Instruction

Building as @StealthCat.

Understand the system.
Build what comes next.

Air Force veteran. Cyber operations professional. Developer and educator. From aircraft avionics to open-source software, I turn complex problems into practical tools.

Explore projects View experience
PythonC / C++RustGo+ more
EVANS, GA / U.S. AIR FORCE VETERANscroll to explore

01 / WHOAMI

A builder’s mindset.
A mission that matters.

My career connects aircraft systems, national-security cyber operations, and software that makes everyday work easier.

I’m an Air Force veteran based in Evans, Georgia, with experience in software and exploit development, penetration testing, malware analysis, reverse engineering, incident response, and technical instruction. I bring the same practical approach to understanding a system, developing a solution, and helping others use it.

Beyond my professional work, I build and share projects on GitHub as StealthCat. I also serve as a director of Roxy’s Second Hope in Georgia and Hope Gardens Cat Rescue in Tennessee.

Cyber operationsSoftware developmentTechnical educationNonprofit leadership
12+ years

Active-duty Air Force service

13 certifications

Plus operational & teaching qualifications

300+ hours / year

Programming & computer science instruction

2 rescues

Director roles in Georgia & Tennessee

02 / EXPERIENCE.LOG

Experience,
in production.

AUG 2016 — PRESENTNational Security AgencyAugusta, Georgia

Journeyman Exploitation Operator

Cyber operations, enterprise software development, and technical education supporting national-level requirements.

Selected accomplishments
  • Wrote and taught Python courses for the U.S. Air Force and National Security Agency; course materials were also used by U.S. Cyber Command.
  • Built enterprise Python tools that streamlined hundreds of daily operations.
  • Created a real-time data pipeline that reduced data delay from 12 hours to 5 minutes.
  • Served as a certified adjunct faculty member for the National Cryptologic Schools, delivering more than 300 hours of annual instruction.
PythonCyber operationsInstruction
OCT 2012 — AUG 2016United States Air ForceAugusta, Georgia

Cyber Warfare Operations

Selected for a new Air Force cyber operations training pipeline and graduated at the top of the class in training that included Undergraduate Cyber Training and RIOT.

Selected accomplishments
  • Developed a VMware training and test range that cut testing and deployment time in half.
  • Led work to identify and productize Android and iOS vulnerabilities, increasing development output by 30%.
Virtualized rangesVulnerability researchMobile security
DEC 2009 — OCT 2012United States Air ForceMcChord Air Force Base, Washington

Integrated Avionics Systems Instructor

Served as a certified Air Force instructor and course designer, training maintenance personnel to diagnose, troubleshoot, and repair C-17 Globemaster III avionics and communications systems.

Selected accomplishments
  • Developed web-based training administration software for 3,200 personnel across three locations.
  • Created more than 240 hours of training material for the 62nd Airlift Wing.
  • Coordinated more than $1.2 million in contracts to improve training equipment, classrooms, and instructor facilities.
C-17A avionicsCurriculum developmentProgram management
MAR 2004 — DEC 2008United States Air ForceMcChord Air Force Base, Washington

Integrated Avionics Systems Technician

Maintained integrated aircraft systems and was selected ahead of 628 other craftsmen for the Prime Nuclear Airlift Force and Presidential Airlift Support Team.

Avionics maintenancePresidential airliftNuclear airlift

03 / REPOSITORIES

Selected projects.
Practical engineering.

github.com/StealthCat

A selection of my public work across DNS policy, storage operations, embedded interfaces, and technical education. Each project links to its source.

Showing 7 projects.

01 / DNS & NETWORK POLICY

Blockinator_

One place to manage DNS decisions across clients, networks, and resolvers. A self-hosted policy controller with blocklists, whitelists, schedules, query history, and traffic statistics.

DNS policySQLite / MySQLDocker
View policy controller
Problem, approach & implementation
The problem
Managing consistent DNS rules across clients and different resolver platforms.
What I built
A policy controller with a management interface, query history, schedules, and companion integrations for Technitium, PowerDNS, and CoreDNS.
Implementation
Authenticated policy decisions over HTTP/HTTPS, IPv4/IPv6 and hostname scopes, SQLite or MySQL storage, and Docker deployment.
// RESOLVER INTEGRATIONSTechnitium ↗PowerDNS ↗CoreDNS ↗
Blockinator repository artwork: DNS network paths surrounding a policy shield.
Blockinator · project artwork
ESP Home Panel Classic theme showing light brightness, fan speed, media controls, and time.

ESP Home Panel · control interface
View full-size screenshot ↗

02 / EMBEDDED & HOME AUTOMATION

ESP Home Panel

A themed, 7-inch ESP32-S3 touchscreen for Home Assistant. Lights, fan and media controls, local weather, optional sensors, and browser-based configuration in one interface.

ESP-IDFLVGLMQTT
Explore the firmware
Problem, approach & implementation
The problem
Putting frequently used home controls and local conditions within easy reach.
What I built
A themed 7-inch touch interface with lighting, fan, media, weather, and optional sensor support.
Implementation
ESP-IDF firmware and LVGL rendering on ESP32-S3; Home Assistant discovery and state synchronization over MQTT; browser-based configuration.

03 / STORAGE & SYSTEMS

NASitron

A remote OpenZFS management workspace for Ubuntu NAS hosts: storage health, pool I/O, drive inventory, snapshots, replication, and guarded maintenance actions over SSH.

OpenZFSSSHObservability
Explore NASitron ↗
Problem, approach & implementation
The problem
Understanding storage health and administering multiple ZFS hosts from one place.
What I built
A browser-based workspace for topology, drive inventory, historical metrics, snapshots, replication, and maintenance.
Implementation
Remote SSH collection, stable disk identities, historical telemetry, health alerts, and reviewed workflows for consequential storage actions.
NASitron repository artwork showing storage servers and a telemetry trace.
NASitron · project artwork
04

WEATHER & EMBEDDED DISPLAYS

HeatIndexDisplay

ESP32-S3 displays that turn personal weather-station data into readable heat index, wind chill, and local conditions, using Ambient Weather or Weather Underground.

ESP32-S3Weather telemetry
↗
05

DISTRIBUTED COMPUTING

BOINC Web

A multi-host BOINC dashboard and JSON API with live task updates, project and host information, lightweight history, and direct GUI RPC communication.

PythonWebSocketsSQLite
↗
06

POWER MONITORING

Victron VE.Direct NUT Driver

An experimental native Network UPS Tools driver that maps Victron SmartShunt and BMV battery telemetry to standard NUT variables for monitoring and automation.

Serial telemetryNetwork UPS Tools
↗
07

TEACHING & KNOWLEDGE SHARING

Teaching Examples

Python teaching examples covering threading, multiprocessing, sockets, argument parsing, object inheritance, and graphical interfaces.

PythonProgramming fundamentals
↗

04 / TECHNICAL EDUCATION

Build the skill.
Share the knowledge.

Course design. Technical instruction.
Practical programming.

I write the curriculum, build the examples, and teach the course.

I’ve written and taught Python courses for the U.S. Air Force and National Security Agency, with course materials also used by U.S. Cyber Command. My experience connects software development with formal instructional design and classroom delivery.

AIR FORCE

Certified instructor
& course designer

Technical instruction and curriculum development, including avionics systems training and more than 240 hours of training material for the 62nd Airlift Wing.

NATIONAL CRYPTOLOGIC SCHOOLS

Certified
adjunct faculty

Programming and computer science instruction, with more than 300 hours of annual teaching.

HANDS-ON LEARNING

Python, taught
through practice

Public examples covering concurrency, sockets, object inheritance, argument parsing, and graphical interfaces.

Explore teaching examples ↗

05 / CREDENTIALS

The knowledge
behind the work.

Offensive security. Defensive operations.
Forensics. Intelligence. Development.

Select a discipline to explore the credentials behind my work. Professional certifications are listed separately from agency, military, and instructional qualifications.

Professional certifications

13 certifications · ISC2 & GIAC
Offensive securityGXPN · GPEN · GAWN3
GIAC

GXPN

GIAC Exploit Researcher and Advanced Penetration Tester

GIAC

GPEN

GIAC Certified Penetration Tester

GIAC

GAWN

GIAC Assessing and Auditing Wireless Networks

Defense & incident responseGCIA · GCIH · GCED3
GIAC

GCIA

GIAC Certified Intrusion Analyst

GIAC

GCIH

GIAC Certified Incident Handler

GIAC

GCED

GIAC Certified Enterprise Defender

Malware analysis & forensicsGREM · GCFE · GCFA · GASF4
GIAC

GREM

GIAC Reverse Engineering Malware

GIAC

GCFE

GIAC Certified Forensic Examiner

GIAC

GCFA

GIAC Certified Forensic Analyst

GIAC

GASF

GIAC Advanced Smartphone Forensics

Security leadership, intelligence & developmentCISSP · GCTI · GPYC3
ISC2

CISSP

Certified Information Systems Security Professional

GIAC

GCTI

GIAC Cyber Threat Intelligence

GIAC

GPYC

GIAC Python Coder

Operational & instructional qualifications

Agency and military qualifications
Operations, instruction & course designNSA · U.S. Air Force · National Cryptologic Schools4
NATIONAL SECURITY AGENCY

Journeyman CNE

Journeyman Computer Network Exploitation Operator

UNITED STATES AIR FORCE

Certified Instructor

Air Force technical instruction and classroom delivery

UNITED STATES AIR FORCE

Certified Course Designer

Air Force curriculum and instructional systems design

NATIONAL CRYPTOLOGIC SCHOOLS

Certified Adjunct Faculty

Programming and computer science instruction

Education

A.S., Cybersecurity

Community College of the Air Force

A.S., Integrated Avionics

Community College of the Air Force

Military technical & leadership training
  • 2004 Air Force Basic Military Training; Electronic Principles; Communication / Navigation / Mission Systems
  • 2005 C-130 E/H AN/APN-59 Radar System Maintenance; C-130 Self-Contained Navigation System
  • 2006 C-130 Traffic Collision Avoidance System; IMDS for Flight Line
  • 2007 C-17A Communication & Navigation Systems Transition; Air Force Training Course; Airman Leadership School
  • 2008 Air Force Training Course
  • 2010 Instructional Systems Designer
  • 2011 Principles of Instruction
  • 2012 IT Fundamentals Basic; Cyber Systems Operations Security+ Certification Apprentice; Cyber Surety Security+ Certification Apprentice
  • 2013 Cyberspace Defense Operations; Intermediate Network Warfare Training
  • 2015 Cyberspace 200

Technical toolkit

Python · Perl · C · C++ · Rust · PHP · Java · Go

Software & exploit development · Penetration testing · MITRE ATT&CK · Malware analysis · Reverse engineering · Incident response · Virtualized test environments

06 / SERVICE & LEADERSHIP

Different missions.
Same commitment.

UNITED STATES AIR FORCE

Technical Sergeant · E-6

March 2004 – September 2016

12 years, 5 months, and 17 days of honorable active service, spanning integrated avionics and cyber warfare operations.

01

Presidential Airlift Support Team

Selected member during my Air Force avionics career.

02

Prime Nuclear Airlift Force

Selected member supporting the nuclear airlift mission.

SELECTED RECOGNITION

Service & distinction

  • Air Force Achievement Medal
  • Nuclear Deterrence Operations Service Medal
Additional service recognition
  • Air Force Outstanding Unit Award 4 Oak Leaf Clusters
  • Air Force Good Conduct Medal 3 Oak Leaf Clusters
  • Global War on Terrorism Expeditionary Medal
  • National Defense Service Medal
  • Global War on Terrorism Service Medal
  • Air Force Overseas Ribbon Long
  • Air Force Expeditionary Service Ribbon with Gold Border 1 Oak Leaf Cluster
  • Air Force Longevity Service 2 Oak Leaf Clusters
  • USAF NCO PME Graduate Ribbon
  • Air Force Training Ribbon

COMMUNITY LEADERSHIP

Technology is personal. So is service.

Alongside my technical work, I serve as a director of two animal-rescue charities.

GEORGIA DIRECTOR

Roxy’s Second Hope

Helping vulnerable cats and kittens get the care they need and a chance at a permanent, loving home.

Meet Roxy’s Second Hope
TENNESSEE DIRECTOR

Hope Gardens Cat Rescue

A small rescue in North Nashville with a focus on feral cats and animal welfare in its community.

Meet Hope Gardens Cat Rescue

07 / CONTACT

Let’s build
a connection.

For professional connections, technical collaboration,
or a conversation about my work.

EMAILbob@bobcronin.comPROFESSIONALConnect on LinkedInOPEN SOURCEgithub.com/StealthCat