Hi, I'm Justin.

Building Reliable
IT Infrastructure.

I'm an IT Technician in a Managed Service Provider environment, keeping Microsoft 365, Windows, and endpoint security running for business clients day to day.

Off the clock I run a Proxmox lab — Linux, Docker, networking, PowerShell. I break things there so I don't have to learn on a client's network.

View Resume View Projects
5Lab Projects
18PowerShell Scripts
3VLANs Segmented
justin@homelab: ~

justin@homelab:~$ cat ./facts

NAMEJustin Hoffmann

ROLEIT Technician → Sysadmin

LOCATIONPensacola, Florida

FOCUSM365 · Virtualization · Networking

LABProxmox · OPNsense · Docker

STATUSOpen to opportunities

justin@homelab:~$

01 — whoami

About Me

I'm an IT Technician at a Managed Service Provider, where I troubleshoot Windows systems, administer Microsoft 365, manage identities, and support endpoint security and networking for business clients. Every day is a different problem, which is the part I like most.

Outside of work I build and improve my home lab. It's where I test virtualization, Linux, Docker, and networking before it matters in a real environment. Building it myself is how I actually learn.

I care about well-documented infrastructure and automating what I can. I'm working toward a Systems Administrator or Infrastructure Engineer role focused on Microsoft 365, virtualization, and networking.

Professional Experience

  • Microsoft 365 Administration
  • Exchange Online
  • Entra ID
  • Active Directory
  • NinjaOne RMM
  • SentinelOne
  • Guardz
  • Barracuda
  • Huntress
  • SonicWall Firewalls

Home Lab & Learning

  • Proxmox VE
  • Docker & Docker Compose
  • Ubuntu Server
  • Linux Administration
  • PowerShell Scripting
  • Networking & VLANs
  • Terraform & Ansible
  • Prometheus & Grafana
  • Jellyfin Media Server
02 — cat ./experience.log

Experience

Present

IT Technician

Managed Service Provider (MSP)

Day-to-day support for business clients — Microsoft 365, networking, endpoint security, and whatever lands in the ticket queue. Half the job is fixing things. The other half is documenting them well enough that the next person isn't starting from scratch.

  • Administer Microsoft 365 — Exchange Online, Entra ID, and on-prem Active Directory, including the full onboarding/offboarding lifecycle and MFA.
  • Migrated a SonicWall firewall LAN zone across interfaces with zero downtime by pre-staging config and verifying cabling before cutover.
  • Automated network printer diagnostics with cross-platform PowerShell and CUPS scripts, cutting manual troubleshooting on Windows and macOS fleets.
  • Triage EDR-flagged files in Huntress and SentinelOne, separating legitimate driver artifacts from genuine threats.
  • Built and maintain a PowerShell toolkit (18 scripts) for network discovery, system health checks, and security auditing.
  • Provide remote support via NinjaOne, with documentation to keep the next ticket faster than the last.
Microsoft 365Exchange OnlineEntra IDActive DirectoryPowerShellSonicWallIntuneNinjaOneSentinelOneGuardzBarracudaHuntressSonicWall
Ongoing

Home Lab & Continuous Learning

Personal Infrastructure Project

Everything I can't justify testing on a client's network gets tested here first. Proxmox host, VLAN-segmented network behind an OPNsense firewall, self-hosted services in Docker, and a growing PowerShell toolkit — all built, broken, and rebuilt on purpose.

  • Deploy and maintain a Proxmox environment running VMs, LXC containers, and Docker.
  • Segmented the network into VLANs behind an OPNsense firewall, with zero downtime to existing Wi-Fi and media services.
  • Self-host services — reverse proxy, dashboards, media server — documented and version-controlled on GitHub.
  • Practice troubleshooting by intentionally testing and recovering from failures — most recently a DHCP reservation bug traced through live Kea logs.
Proxmox VEDockerOPNsenseVLANsUbuntu ServerLinuxTerraformAnsibleGrafanaPowerShellGitGitHub
03 — ls ./projects/

Featured Projects

Real infrastructure I've built and run — a segmented home network, self-hosted services, a PowerShell toolkit — not tutorials I followed once.

Infrastructure

Proxmox Home Lab

→

The host everything else runs on. Proxmox VE, running the VMs and containers behind every other project here — snapshotted and backed up so I can break things safely.

  • Virtual Machines & LXC Containers
  • Docker Integration
  • Snapshots & Backups
  • Linux Administration
Proxmox VEDockerUbuntuLinuxNetworking
View Project →

Automation

Infrastructure as Code & Observability

→

Rebuilt my Docker host from scratch — provisioned by Terraform, configured by Ansible, monitored by Prometheus, Grafana, and Loki. No more clicking through a UI and hoping I remember what I did.

  • Terraform VM Provisioning
  • Ansible Configuration
  • Prometheus + Grafana
  • Loki Log Aggregation
  • Uptime Kuma Alerting
TerraformAnsiblePrometheusGrafanaDocker
View Project →

Administration

Microsoft 365 Administration

→

My day job. Microsoft 365 administration across a rotating set of client tenants — identities, licensing, Exchange Online, and security.

  • Exchange Online
  • Entra ID
  • Microsoft 365 Licensing
  • Multi-Factor Authentication
  • User Provisioning
Microsoft 365ExchangeEntra IDPowerShell
View Project →

Networking

Networking Lab — Phase 1: Segmentation

→

Segmented a flat home network behind an OPNsense firewall — three VLANs, 802.1Q trunking over a single NIC, per-VLAN DHCP and DNS. Nobody else in the house noticed it happen.

  • OPNsense Firewall (Proxmox VM)
  • VLAN Segmentation (802.1Q)
  • Kea DHCP & Unbound DNS
  • Zero-Downtime Migration
OPNsenseVLANsNetworkingFirewall
View Project →

Automation

PowerShell Automation

→

18 PowerShell scripts for network discovery, system health checks, and security auditing. If I do something by hand twice, it becomes a script.

  • Async Network Scanner
  • Multi-Threaded Runspaces
  • System Health Diagnostics
  • Security & User Auditing
  • CSV Export & Reporting
PowerShellAutomationNetworkingWindows
View Project →
04 — ./arsenal.sh

Skills & Technologies

Microsoft 365 & Identity

The bulk of my ticket queue — provisioning, licensing, MFA policy, and mailbox issues across a rotating set of client tenants.

Microsoft 365Exchange OnlineEntra IDIntuneAzure FundamentalsMFAUser Management
See it in a project →

Windows & Active Directory

Group Policy, permissions, and the occasional domain controller that needs babying — keeping client domains healthy day to day.

Windows 11Windows ServerActive DirectoryGroup PolicyDNSDHCP

Virtualization

Where the home lab actually lives — a Proxmox host running LXC containers and VMs, snapshotted and backed up like production.

Proxmox VEVirtual MachinesLXC ContainersSnapshotsStorageBackups
See it in a project →

Linux & Docker

Every service in the lab runs containerized, defined in Compose files and deployed by Ansible rather than by hand.

Ubuntu ServerDockerDocker ComposeLinux CLITerraformAnsible
See it in a project →

Networking

OPNsense firewall rules and 802.1Q VLAN trunking — segmented my home network into MGMT, SERVERS, and IOT with zero Wi-Fi downtime.

TCP/IPVLANsOPNsenseDNSDHCPTailscaleSonicWall
See it in a project →

Security

The tools standing between client environments and whatever's trying to get in — deployed, monitored, and occasionally the reason I'm still troubleshooting after 5pm.

SentinelOneHuntressGuardzBarracudaIntuneEndpoint Protection

Automation & Development

18 scripts and counting. If I do something by hand more than twice, it becomes a PowerShell script with a param block.

PowerShellCUPSGitGitHubVS CodeScripting
See it in a project →

IT Operations

The unglamorous half of the job — documentation, ticket hygiene, and making sure the next tech (or future me) isn't guessing what a client's setup looks like.

NinjaOneRemote SupportHardware TroubleshootingSoftware DeploymentDocumentationCustomer Support
05 — ./contact.sh

Let's Connect

Whether you're interested in my work, have an IT opportunity, or simply want to connect, I'd love to hear from you.

Interested in working together?

I'm always interested in connecting with other IT professionals, collaborating on projects, and exploring new career opportunities.

Emailjhoffmann3987@yahoo.com
GitHubgithub.com/jhoffmann3987
LocationPensacola, Florida
View ResumeDownload ResumeView GitHub