Linux Systems Administrator, Sr.

Caelum Research Corporation

Maryland

On-site

USD 90,000 - 140,000

Full time

14 days+

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Benefits offered by this job

401(k)

Dental insurance

Health insurance

Paid time off

Tuition reimbursement

Job summary

Caelum Research Corporation is looking for a Senior Linux Systems Administrator to provide expert support for a vital government IT contract. This full-time position is based on-site at Aberdeen Proving Ground, MD, where the candidate will oversee Linux infrastructures while mentoring junior staff.

Successful applicants will have significant experience with Linux systems and automation, and certifications in security and Linux technologies are strongly preferred. The role comes with a competitive salary ranging from $90,000 to $140,000 per year, along with comprehensive benefits.

Qualifications

Deep technical expertise in Red Hat Enterprise Linux (RHEL).
Minimum of 5 years of directly related IT experience with a Master's degree.
Current Security+ certification or equivalent.

Responsibilities

Install, configure, and manage UNIX variants.
Provide mentorship and guidance to junior staff.
Automate routine tasks through scripting.

Skills

Linux Systems Administration

Scripting Proficiency

Networking & Troubleshooting

Technical Mentorship

Automation & Deployment

Security & Compliance

Education

Bachelor’s Degree in IT discipline

Master’s Degree in IT discipline

Associate’s degree in IT discipline

High School Diploma / GED

Tools

Red Hat Enterprise Linux (RHEL)

ACAS

Windows Server

Job description

Senior Linux 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 Linux Systems Administrator to support a critical government IT services contract. The successful candidate will act as a primary subject matter expert for Linux infrastructure, automation, and high‑availability systems. This role requires deep technical expertise in Red Hat Enterprise Linux (RHEL), enterprise production environments, and network storage. As a senior member of the team, the candidate will also provide technical guidance and mentorship to other IT professionals.

Core Responsibilities & Technical Qualifications

Linux Systems Administration: Install, configure, and manage UNIX variants, with a heavy emphasis on Red Hat Linux server operating systems and associated middleware.
Technical Mentorship: Act as a senior technical resource, providing mentorship, guidance, or team lead support to junior administrators and technical staff.
Automation & Deployment: Manage complex production environments using automated installation, build and deployment, and configuration management frameworks.
Scripting Proficiency: Write and utilize operating system commands and scripts to automate routine tasks, utilizing one or more of the following: Bash, Python, PowerShell, Ruby, or Perl.
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.
System Lifecycle Management: Plan and execute seamless operating system upgrades and environment migrations with minimal mission impact.

Preferred Qualifications

Vulnerability Scanning (ACAS): Experience utilizing the Assured Compliance Assessment Solution (ACAS) for vulnerability scanning, analysis, and compliance reporting.
Windows Administration: Familiarity or experience with Microsoft server operating systems, Windows event and performance monitoring, and Microsoft 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 Linux‑based certification (e.g., Red Hat Certified System Administrator [RHCSA] or Red Hat Certified Engineer [RHCE]) is strongly preferred.

Job Type: Full‑time

Salary: $90,000 – $140,000 per year

Benefits