IT Support / Systems Technician

David Lorow

Microsoft 365 • Active Directory • Networking • Homelabbing • Ticketing • Documentation

IT / Help Desk technician with hands-on experience in Microsoft 365, Active Directory, ticketing, networking, and endpoint support. Comfortable troubleshooting real business environments and documenting fixes clearly. I also run a Proxmox homelab at home to keep sharpening the same skills.

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Infrastructure & IT

Hands-on IT support experience spanning helpdesk fundamentals and more advanced infrastructure work. I don't just troubleshoot. I dig until I understand the root cause.

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Networking
Physical & logical network tracing
Production
Port Mapping Across Switch Hops
Traced and mapped ports across network switches through multiple switch hops, both physically with a toner/probe and logically with DNS resolution.
Ethernet Connectivity Diagnosis
Identified and resolved ethernet connectivity problems affecting laptops. Setting the address of the gateway fixed it.
Switch Documentation
Documented port mappings for the core and distribution switches.
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System Administration
Active Directory, Intune, PC imaging
Field-Tested
Active Directory / OU Management
Managed devices and organizational units within an Active Directory environment.
Intune & Domain Troubleshooting
Resolved domain and Intune-related issues affecting users on new devices.
PC Imaging & Replacement
Handled computer replacements via imaging. Oftentimes had to shrink the partition before taking the image for efficiency, requiring a defragment first.
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Internal Communications
Signage, intranet, and media production
Multi-Domain
Digital Media Production
Produced digital media for internal communications.
Yodeck & LED Signage
Configured Yodeck displays and LED poster systems for HR and Marketing.
Custom Web Page Embedding
Embedded custom web pages regarding safety within the company intranet for the Quality team.
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System Troubleshooting
Windows repair & hardware diagnosis
Advanced
Boot File Repair (Win10 32-bit)
Repaired low-level Windows 10 boot file corruption on 32-bit systems.
Hardware Performance Diagnosis
Diagnosed and resolved performance issues due to insufficient hardware.
Bluetooth Connectivity
Troubleshot a variety of bluetooth connectivity failures across multiple machines.

Projects

Hardware inside a homelab server

Proxmox Homelab

One machine, three workloads. A single-node Proxmox VE hypervisor consolidating a gaming desktop, a SaaS staging server, and a self-hosted media stack, all remotely accessible with zero exposed ports.

  • Full GPU passthrough to Windows 11 via VFIO/IOMMU for bare-metal graphics inside a VM
  • Fail-closed WireGuard killswitch for VPN-enforced traffic on the media services VM
  • Production-mirroring Docker staging environment for a three-container SaaS
  • Tailscale on the Proxmox host and every VM, with no ports forwarded on the router
Read the deep dive →
Rubber Band Habits source and app screen

App: Rubber Band Habits

A full habit-tracking iOS app built in SwiftUI and shipped to the App Store. Clean, minimal, and opinionated.

  • Good and bad habit types with daily, weekly, and monthly goal tracking
  • Migrated persistence from UserDefaults to SwiftData for a single source of truth
  • Native Apple design language: progress, calendar, and insights views
  • Live on the App Store
Read the deep dive →
MNIST classifier Jupyter notebook

Pytorch: MNIST Linear Classifier

A complete PyTorch training pipeline built from first principles, reaching 90% test accuracy on MNIST.

  • Cross-entropy loss, backpropagation, and bias-variance understood from the math up
  • Greedy 1D hyperparameter search across learning rate, weight decay, and batch size
  • GPU acceleration (CUDA / Apple Silicon MPS) with fixed-seed reproducibility
  • Loss/accuracy curves and confusion matrix visualized in a Jupyter notebook
Read the deep dive →