Security Automation
Automating tasks that improve visibility, speed up checks, and reduce repetitive manual effort across systems and workflows.
Simple View • Sentinel Portfolio
Security-minded builder focused on practical systems, automation, and lab-driven learning.
I’m Matt Chelminski, an IT and security-focused builder who enjoys turning messy real-world problems into clean, useful solutions. My work centers on Windows administration, PowerShell and Python automation, networking, security tooling, and homelab projects that can be tested, documented, and improved over time.
Core Strengths
The strongest themes across this portfolio are practical security thinking, systems automation, technical troubleshooting, and building small tools that are actually useful.
Windows & Admin Workflows
Practical administration, remote inventory, reporting, environment checks, and repeatable operational tasks.
Networking & Security Fundamentals
Strong interest in subnetting, traffic awareness, host visibility, service behavior, and security-minded configuration.
Homelab Engineering
Self-hosted services, internal tooling, experiment-driven learning, and iterative testing in controlled environments.
Experience Snapshot
A quick overview of the type of work this portfolio supports: practical operations, technical problem-solving, scripting, and applied security thinking.
IT / Systems Support & Technical Operations
Operational troubleshooting, endpoint work, reporting, and environment support
Hands-on work with systems, technical support, process improvement, documentation, and practical fixes that reduce friction for real users and real environments.
Automation & Scripting
PowerShell, Python, and task-focused tooling
Building scripts and utilities that collect data, simplify repeated actions, improve reporting, and make operational work more reliable and consistent.
Security-Oriented Projects
Labs, awareness tools, sinkholes, honeypots, and internal testing
Projects designed to improve understanding of visibility, defense, phishing awareness, DNS controls, alerts, and practical security workflows in lab settings.
Featured Projects
A mix of automation, security, and lab work designed to be practical, reproducible, and easy to understand.
Remote Inventory & Reporting
Collect system and software data across multiple hosts and export clean reports for review, troubleshooting, and decision-making.
Windows Administration Automation
Repeatable workflows for auditing, configuration checks, endpoint review, and day-to-day operating-system administration tasks.
Homelab Services
Self-hosted dashboards, infrastructure experiments, internal services, and learning environments built to improve technical depth through hands-on practice.
Phishing Awareness Tools
Interactive training utilities and safe analysis workflows for spotting suspicious emails, weak signals, and common red flags.
DNS Sinkhole / Blocking
Experiments focused on blocking malicious or unwanted domains while improving insight into request behavior and filtering results.
Honeypot Alerts
Trap services with detection and notifications designed to surface suspicious activity in a way that is clear, visible, and actionable.
Web Projects
Browser-based utilities and learning apps that support security, networking, conversions, awareness training, and day-to-day technical work.
Multi-use Converter
Binary, ASCII, hex, and Base64 conversions in one place for fast utility work.
Multi-use Media Converter
Format conversion helpers and utility workflows in a single browser-based tool.
Hashes + HMAC + Ciphers
MD5, SHA, HMAC, and basic crypto demos for learning and experimentation.
Subnet / CIDR Visualizer
Quick CIDR breakdowns, subnetting help, and address range visualization.
Password Strength Analyzer
Entropy hints, pattern awareness, and practical strength feedback.
Phishing Email Analyzer (Offline)
Header and URL checks for offline awareness and investigation workflows.
Security Awareness Mini-Games
Quick training games and short exercises designed to reinforce awareness through interaction.
Encryption
Learning-focused encryption examples that help explain core concepts through simple browser-based demos.
Notes & Writeups
These note pages come directly from the DesktopWebPage notes section and are now featured more prominently here as part of the static portfolio. They help show personality, learning style, and practical technical thinking through quick references and focused writeups.
Hacker Pour-Over Lab
A playful note page centered on routine, consistency, experimentation, and controlled process.
IT Truths Wall
Short reminders, lessons learned, and technical observations pulled from hands-on work.
Useful Tools
A curated list of tools, where they fit, and why they matter in practical workflows.
Cheatsheets
Fast command lookups, useful flags, and quick mini-checklists for day-to-day technical work.
Tech Stack
Technologies used with an emphasis on strong fundamentals, maintainable automation, and security-aware operations.
Languages & Scripting
PowerShell, Python, JavaScript, and Bash for automation, tooling, browser apps, and systems work.
Platforms
Windows administration, Kali Linux, Ubuntu, Debian, virtualization, and practical homelab environments.
Security & Networking
Networking fundamentals, traffic awareness, secure configuration, detection-oriented thinking, and operational visibility.
Contact
The best way to reach me is through one of the channels below.