---
title: 'Senior Systems Administrator IV at Caelum Research Corporation'
canonical: 'https://feeny.ai/job/senior-systems-administrator-iv-caelum-research-corporation-aberdeen-5nrdd44892dg'
type: 'job'
last_seen: '2026-09-25'
---

# Senior Systems Administrator IV at Caelum Research Corporation

- **Company:** Caelum Research Corporation
- **Location:** Aberdeen, MD
- **Compensation:** $90k–$135k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-09-24
- **Last confirmed live:** 2026-09-25
- **Apply:** https://jobs.gem.com/caelumresearch/am9icG9zdDrywhxpJw6a0gwHdYXWSJQN

## Job description

Senior Windows Systems Administrator

- Position: Systems Administrator IV
- Supported Program: U.S. Army Test & Evaluation Command
- Clearance Requirement: DoD Secret
- Location: On-site at Aberdeen Proving Ground, MD

## Role Overview

We are seeking a highly skilled Senior Windows Systems Administrator to support a critical government IT services contract. The successful candidate will act as a primary subject matter expert for Windows infrastructure, automation, virtualization, and high-availability systems. This role requires deep technical expertise in Microsoft Windows Server, enterprise production environments, network storage, and virtualization technologies. As a senior member of the team, the candidate will also provide technical guidance, leadership, and mentorship to other IT professionals.

Core Responsibilities & Technical Qualifications

- Windows Systems Administration: Install, configure, and manage Microsoft server operating systems, with a heavy emphasis on Windows Server operating systems, Active Directory (AD) configuration, Group Policy (GPO) management, and associated middleware.
- Virtualization Management: Manage a VMware environment, including systems deployment, patching, STIG/hardening, and troubleshooting.
- Technical Mentorship: Act as a senior technical resource, providing mentorship, guidance, or team lead support to junior administrators and technical staff; may lead 5 or more employees.
- Centralized Logging & Analytics (Elastic Stack): Configure, maintain, and utilize the Elastic Stack (ELK) to ingest, analyze, and visualize system logs and performance metrics across the enterprise to proactively identify system anomalies and security events.
- Automation & Deployment: Manage complex production environments using automated installation, automated build and deployment, and automated configuration management frameworks.
- Scripting Proficiency: Write and utilize operating system commands and scripts to automate routine tasks, utilizing PowerShell and being familiar with others like Python or Bash.
- High-Availability Infrastructure: Build, maintain, and support clustered, scalable, and high-availability systems, including load balancing, web servers, application servers, and server virtualization.
- Networking & Troubleshooting: Apply foundational networking principles (TCP/IP, firewalls, routing, VLANs) to perform general network troubleshooting and resolve complex system issues.
- Performance Monitoring & Optimization: Utilize enterprise monitoring tools for event and performance monitoring. Conduct performance tuning, capacity planning, and bottleneck resolution.
- Security & Compliance: Apply Defense Information Systems Agency (DISA) Security Technical Implementation Guides (STIGs) to harden systems, remediate advanced security vulnerabilities, manage identity and access configurations, and ensure overall system security compliance. Experience with ESS (e.g., McAfee/Trellix) is required.
- System Lifecycle Management: Plan and execute seamless operating system upgrades and environment migrations with minimal mission impact.
- Hardware and Storage: Support enterprise hardware and storage environments, including CISCO Unified Computing System (UCS) and technologies such as Commvault, NetApp, or VSAN.

## Preferred Qualifications

- Vulnerability Scanning (ACAS): Experience utilizing the Assured Compliance Assessment Solution (ACAS) for vulnerability scanning, analysis, and compliance reporting.
- Linux Administration: Familiarity or experience with Linux server operating systems (e.g., RHEL), event and performance monitoring, and associated middleware.
- Database Technologies: Knowledge of database technologies, including installation and configuration of database management systems and migration of databases.

Education and Experience Requirements

Candidates must meet one of the following education and experience combinations. Education must be in a directly related IT discipline (e.g., Computer Science, Information Systems, Computer/Software Engineering, Management Information Systems, or Computer Forensics/Security).

- High School Diploma / GED: Minimum of 11 years of directly related IT experience.
- Associate's degree: Minimum of 9 years of directly related IT experience.
- Bachelor's Degree: Minimum of 7 years of directly related IT experience.
- Master's Degree: Minimum of 5 years of directly related IT experience.

Certifications

- DoD Directive 8570.01 Compliance: Must possess a current Security+ certification (or equivalent IAT Level II baseline certification).
- Computing Environment (CE): Must hold at least one current Computing Environment certification, or be able to obtain one within 6 months of start. Given the technical requirements of this role, a Microsoft-based certification (e.g., Microsoft Certified: Windows Server Hybrid Administrator Associate, MCSE) is strongly preferred.

Benefits:

- 401(k)
- 401(k) matching
- Dental insurance
- Employee assistance program
- Employee discount
- Flexible schedule
- Flexible spending account
- Health insurance
- Life insurance
- Paid time off
- Parental leave
- Professional development assistance
- Referral program
- Tuition reimbursement
- Vision insurance

## About Caelum Research Corporation

## Company Overview
- **One-liner**: Caelum Research Corporation is a woman-owned small business (WOSB) providing information technology, systems engineering, data analytics, cybersecurity, and program management solutions primarily to the U.S. federal government and commercial clients.
- **Entity Type**: Private (Woman-Owned Small Business)
- **Headquarters**: Rockville, Maryland, United States
- **Founded**: 1987
- **Founders**: Michael Yeh, Ph.D. and Diana Yeh

## Core Business
- **Primary industry/industries**: Federal IT Services, Defense & Government Contracting, Cybersecurity, Systems Engineering, Data Management
- **Target customers**: B2G (Business-to-Government) — primarily U.S. federal agencies including the Department of Defense (DoD), NASA, and other science and research agencies; also serves commercial customers.
- **Mission or purpose statement**: To deliver quality products and services that create value through efficiencies and innovation, exceeding customer expectations, and meeting commitments, driven by a culture of integrity, teamwork, innovation, and quality.

## Products & Services
- **Enterprise IT & Cloud Technology**: Services including enterprise architecture, cloud migration, datacenter modernization, managed IT services, DevSecOps, and help desk support.
- **Cybersecurity**: Security architecture and engineering, risk management framework, vulnerability management, identity and access management, and disaster recovery.
- **Data Management & Analytics**: Full data lifecycle engineering, data governance, database administration, data modeling, data visualization/BI dashboards, and application of AI/ML.
- **Software Engineering**: Agile SDLC methodology, application modernization, UI/UX design, mobile application development, and legacy system support.
- **Logistics Support**: RAM/ILSC, change management, IT asset/inventory management, and warehouse/logistics support.
- **Strategic Program Support**: PMO/OCIO support, IT service design, business process engineering, and knowledge management.

## Market Standing
- **Valuation/Market Cap**: Not publicly available (private company)
- **Key Metric**: Total Employees — 239 (as of most recent Built In data)
- **Notable Investors/Partners**: Prime contract vehicles include Army ITES-3S, Navy SeaPort-NxG, GSA MAS – IT Services, and MDA SHIELD. Holds a Top Secret facility clearance (FCL).
- **Growth Signals**: Employees located in 11 states across the U.S. (CONUS and OCONUS); over 37 years of sustained operations; holds multiple prime contract vehicles and industry certifications.

## Competitive Advantages
- **Woman-Owned Small Business (WOSB) status** with SBA-certified HUBZone designation, providing a competitive edge in securing federal contracts.
- **Established track record**: Over 37 years of experience supporting U.S. government agencies, including the DoD and NASA.
- **Prime contract vehicles** across multiple agencies, giving direct access to mission-critical work without relying on subcontracts.
- **Top Secret facility clearance** enabling work on classified programs.

## Strategic Focus
- Expanding capabilities in **data management and AI/ML** applications.
- Continuing to support **cloud migration and datacenter modernization** across federal clients.
- Strengthening cybersecurity offerings aligned with the **Risk Management Framework (RMF)**.
- Maintaining a **hybrid work model** to attract talent from across the U.S. while supporting on-site requirements at client locations.

## Why Work Here
- **Work environment**: Hybrid workspace — employees engage in a combination of remote and on-site work, with client sites across the continental U.S. and overseas.
- **Company culture**: Emphasis on integrity, teamwork, innovation, and quality. A woman-owned business that fosters opportunities for professional growth with supportive management and continuous process improvement.
- **Stability**: Over 37 years in business with consistent federal contracts; offers a stable, mission-focused work environment.
- **Diverse project exposure**: Opportunity to work with multiple federal agencies (DoD, NASA) and on a wide range of technologies from legacy systems to modern cloud and AI/ML solutions.
- **Employee base**: 239 total employees across 11 states, indicating a distributed workforce with on-site, hybrid, and remote options.

## Sources
1. [caelum.com](https://caelum.com/)
2. [caelum.com - About](https://caelum.com/about/)
3. [caelum.com - Employment](https://caelum.com/jobs/)
4. [Built In - Caelum Research Corporation](https://builtin.com/company/caelum-research-corporation)
5. [caelum.com - Company One-Pager (2026)](https://caelum.com/wp-content/uploads/2026/02/Caelum-One-Pager-2026_v3.pdf)

## Other roles at Caelum Research Corporation

- [AWS Cloud Engineer](https://feeny.ai/job/aws-cloud-engineer-caelum-research-corporation-carlise-694xqgbzeqyd) — Carlise, PA
- [Project Manager (Copy)](https://feeny.ai/job/project-manager-copy-caelum-research-corporation-huntsville-djah15c1ahan) — Huntsville, AL
- [Project Manager (Copy)](https://feeny.ai/job/project-manager-copy-caelum-research-corporation-huntsville-y06afnvycs5z) — Huntsville, AL
- [Project Manager](https://feeny.ai/job/project-manager-caelum-research-corporation-huntsville-6bcw5h003h1a) — Huntsville, AL
- [Computer Technician III (Ft.Bliss)](https://feeny.ai/job/computer-technician-iii-ft-bliss-caelum-research-corporation-fort-bliss-qvxv5dcj2xnc) — Fort Bliss, TX