Hello, I'm Ray

Corey Miller

Experienced System Administrator at Federal Government

IT Administrator | Systems Thinker | Problem Solver: With over 7 years of experience in federal and enterprise environments, I help keep systems running, users productive, and technology aligned with mission-critical needs. Skilled in automation, diagnostics, and infrastructure support—driven to build resilient systems that make work easier for everyone.

CompTIA CySA+
CompTIA Network+
CCNA
Systems Thinking
Adaptability
Strategic Problem Solving
Cross-Functional Communication
Initiative & Ownership
Mentorship & Peer Development
Operational Awareness
Conflict Navigation

Skills

Experiences

1
United States Marine Corps

Jul 2022 - Dec 2023

New York City Metropolitan Area

Elite military branch where technical excellence, operational readiness, and infrastructure reliability are mission-critical.

System Administrator (GS-9)

Jul 2022 - Dec 2023

Responsibilities:
  • Administer, secure, and troubleshoot IT infrastructure supporting federal operations and critical communications
  • Manage Active Directory, user provisioning, and system rollouts in a high-stakes, security-focused environment
  • Ensure continuous availability of essential services through scripting, process standardization, and proactive maintenance
  • Coordinate across units to resolve complex issues affecting network integrity and endpoint performance
Compass Point

Jun 2021 - Jul 2022

New York City Metropolitan Area

Full-service IT consultancy providing solutions for private and public sector clients.

System Analyst

Jun 2021 - Jul 2022

Responsibilities:
  • Delivered Tier 2/3 support, systems analysis, and user training for enterprise clients
  • Diagnosed software, hardware, and access control issues using a mix of scripting, logs, and monitoring tools
  • Assisted in rollouts, migrations, and documentation across hybrid environments
2
3
Leukemia & Lymphoma Society

Oct 2020 - Jun 2021

Rye Brook, NY

Non-profit organization focused on curing blood cancers and improving quality of life for patients.

Help Desk Specialist

Oct 2020 - Jun 2021

Responsibilities:
  • Supported 1,300+ users in a Windows-based environment with troubleshooting and rapid issue resolution
  • Performed Active Directory tasks (moves, adds, changes), endpoint remediation, and user onboarding
NYC HRA Department of Social Services

Dec 2018 - Oct 2020

New York City Metropolitan Area

Largest municipal social services agency in the U.S., supporting millions of New Yorkers annually.

Remote Site Administrator (Internship)

Dec 2018 - Oct 2020

Responsibilities:
  • Provided on-site and remote desktop support across satellite offices
  • Assisted with network troubleshooting, imaging, and access control
4
5
United States Air Force

Aug 2010 - Dec 2017

Columbus, Mississippi

Technical and tactical branch of the U.S. Armed Forces specializing in air, space, and cyber operations.

Electronic Security Technician

Aug 2010 - Dec 2017

Responsibilities:
  • Installed, maintained, and tested electronic security systems on military installations
  • Handled classified communications equipment and incident response support
  • Managed financial planning and budget allocations for operational units
  • Oversaw identity verification systems, physical access controls, and visitor screening protocols
  • Provided law enforcement, force protection, and emergency response on base

Education

York College (CUNY)
2020-2022
Information Systems Management
Taken Courses:
  • Advanced Algorithms
  • Machine Learning
  • Distributed Systems
  • Database Systems
  • Software Engineering
  • Computer Networks
Queensborough Community College
2017-2019
Computer Science and Information Security — Associate in Science degree (AS)
Taken Courses:
  • Data Structures and Algorithms
  • Computer Architecture
  • Operating Systems
  • Programming Languages
  • Software Engineering
  • Computer Graphics
  • Artificial Intelligence
  • Web Development
Various Providers
2017-2024
Professional Certifications
Multiple Platforms
2018-Present
Online Learning & Continuous Education

Projects

600-System Compliance Standardization
Project Lead / IT Administrator Jan 2023 – Nov 2023

Led a proactive initiative to bring 600+ federal systems into compliance with new security and configuration baselines. Created audit checklists, automated validation scripts, and coordinated with leadership to complete rollout ahead of schedule.

professional powershell compliance endpoint-management leadership
Remote Imaging & Automation Toolkit
Systems Administrator Jul 2022 – Present

Developed a modular imaging and onboarding toolkit using PowerShell and batch scripting to automate OS deployment, app installation, and remote setup in constrained environments with limited tooling.

automation powershell windows deployment scripts
Tier 3 Remote Troubleshooting Suite
Escalation Technician Apr 2022 – Present

Built a suite of remote tools for enterprise clients to diagnose and resolve issues related to DNS, GPO application, service failures, and user access without logging in interactively. Improved response time and decreased recurring tickets.

msp troubleshooting powershell scripting enterprise-support
Active Directory Cleanup & Optimization
Systems Analyst Jun 2021 – Jan 2022

Audited and cleaned up AD objects across multiple OUs, eliminating stale accounts, resolving permission overlaps, and improving group membership logic with automated checks. Reduced user provisioning errors and streamlined access audits.

activedirectory powershell it-ops identity-management
Technician SOP & Mentorship Program
Peer Trainer / Process Owner Jan 2023 – Present

Documented core support workflows, built onboarding materials, and led mentorship for junior techs. Standardized triage, escalation, and deployment practices across teams to increase consistency and reduce ramp-up time.

professional mentoring documentation training process-improvement leadership