Summary
Overview
Work History
Education
Skills
Timeline
Generic

JOHN HALBERT

Littleton,CO

Summary

System administrator with expertise in hardware, software, and security planning. Proficient in selecting, installing, configuring, and managing system components. Strong skills in Windows and Linux environments, complemented by advanced knowledge in information security.

Overview

13
13
years of professional experience

Work History

SR System Administrator (contractor)

TTEC
02.2025 - Current
  • I provide comprehensive support for our VMware environment, which encompasses 3,432 server virtual machines. This includes maintaining our Cisco UCS infrastructure until all workloads are successfully migrated to the cloud. Furthermore, I am actively involved in our Google Cloud initiatives, focusing on server build-outs, updates, and the development of patching and software deployment strategies within that environment. I trained other techs, and I am the lead.

Microsoft System Administrator (contractor)

State of Colorado - Department of Education
02.2024 - 02.2025
  • I provide comprehensive support for our VMware environment, which includes managing 247 server virtual machines. I was the lead tech. My responsibilities also encompass the maintenance and updating of our Cisco UCS infrastructure and the administration of Pure Storage, which serves as our Fibre Channel NAS. I developed and implemented an alerting system using SolarWinds. Furthermore, I have extensive experience in server builds and upgrades, spanning from Windows Server 2008 to 2022. I am proficient in managing our VDI network, having successfully updated it from version 2022 to 2406, which included updating all agents. Additionally, I manage both Active Directory and Intune, and oversee Windows patching for all servers.

Windows System Administrator

Church Mutual
05.2022 - 02.2024
  • Upgraded VMware hosts across 50 hosts and 8 clusters, enhancing infrastructure stability.
  • Upgraded VMware guest agents on 1,800 servers to improve system performance.
  • Supported Windows patching and maintenance for 3,000 servers using SCCM.
  • Executed manual deployments in DMZ environments to ensure security compliance.
  • Provisioned servers for multiple projects and upgrades since 2012, ensuring timely delivery.
  • Created and updated Citrix gold images and deployed software monthly.
  • Maintained consistency in Citrix through software updates, optimizing user experience.

Data Center Manager/Administrator

Stevinson Auto/Asbury Auto
Lakewood, CO
12.2016 - 04.2022
  • During my tenure at Stevinson, I was responsible for the comprehensive management of the Cisco network, Windows Server 2016 infrastructure, and Exchange Server 2016. I also supported nine Avaya Phone Systems and provided technical assistance to 650 users. I ran a team of 4 guys and worked with 30 different vendors. Key initiatives included upgrading network equipment and servers, as well as migrating the entire company from Windows 7 to Windows 10.
  • I developed and implemented Mimecast scripts to proactively block and prevent email-borne attacks, incorporating the latest threat vector intelligence. My leadership responsibilities included creating weekly schedules for the IT team and developing project plans while providing training to my IT staff. I also initiated the migration of various services to cloud-based platforms.
  • My expertise encompasses Active Directory, Exchange, VMware, Cisco switches, and HP switches. I have experience in building Cisco firewalls and VPN networks, installing new Avaya phone systems, and providing comprehensive training to entire store locations. Furthermore, I engineered a Linux-based image server to facilitate rapid computer reimaging and established highly secure Linux servers for backups and HR program storage.

Account Admin/T2

Denovo
Boulder, CO
10.2014 - 12.2016
  • My primary responsibilities include managing inbound calls and performing comprehensive user account administration (creation, modification, and deletion) for all Denovo and its clientele. I am also responsible for creating and updating documentation and run books.
  • Key achievements include:
  • Developing a custom MSI for Lewan to streamline SAP software installations on Citrix servers.
  • Creating PowerShell and VB scripts for:
  • Generating reports in Active Directory and Exchange.
  • Automating software installations.
  • Automating the creation of Active Directory, Exchange, and Windows Management accounts.
  • Modifying hidden fields in Active Directory and Exchange.
  • Automating Exchange account removal and PST file creation.
  • Resolving complex workstation issues on non-English systems.
  • Developing a script to resolve password-related issues on macOS devices.

Software Deployment and Scripting Software

Tech Systems-Agrium
Loveland, CO
04.2012 - 10.2014
  • My primary role involves software engineering and deployment for an enterprise environment of 16,000 computers, alongside scripting for Windows servers and managing software installations and upgrades. I developed deployment tools using PowerShell and engineered programs utilizing C, C++, and C#.
  • I am adept at end-to-end project management, collaborating with business stakeholders to define objectives, establish delivery expectations, and design complex technical solutions.
  • A significant achievement was the creation of a self-healing program designed to proactively identify and repair issues within both vendor-supplied and internally developed applications. This program operates silently, repairing software before launch and seamlessly applying necessary Windows updates without user prompts or interruptions. This innovation eliminated the need for user support calls, significantly increased user productivity, and allowed IT teams, including myself, to reallocate resources to more complex issues. This initiative notably reduced ticket volume by 75% within the first week, achieving an impressive 180% reduction within six months.
  • Additionally, I engineered a software deployment portal using XML, PowerShell, and C, which provides users with a streamlined and license-paired method for software acquisition and installation.

Education

A.A.S. - IT/Computer Networking Systems

ITT Tech
Thornton, CO
12.2011

Skills

  • Cisco UCS and Azure management
  • Google Cloud deployment
  • Software deployment in SCCM and Citrix
  • Windows Server administration
  • IT project management
  • VMware administration

Timeline

SR System Administrator (contractor)

TTEC
02.2025 - Current

Microsoft System Administrator (contractor)

State of Colorado - Department of Education
02.2024 - 02.2025

Windows System Administrator

Church Mutual
05.2022 - 02.2024

Data Center Manager/Administrator

Stevinson Auto/Asbury Auto
12.2016 - 04.2022

Account Admin/T2

Denovo
10.2014 - 12.2016

Software Deployment and Scripting Software

Tech Systems-Agrium
04.2012 - 10.2014

A.A.S. - IT/Computer Networking Systems

ITT Tech

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