Linux Systems Administrator, Sr. with Security Clearance

Caelum Research Corporation; Maryland; On-site; USD 90,000 - 140,000; Full time

Benefits offered by this job

401(k)

401(k) matching

Health insurance

Life insurance

Paid time off

Parental leave

Vision insurance

Employee assistance program

Job summary

Caelum Research Corporation seeks a highly skilled Senior Linux Systems Administrator to support a critical government IT services contract at Aberdeen Proving Ground, MD. The role requires deep expertise in Red Hat Enterprise Linux, automation, and high-availability infrastructures.

As a senior SME, you will install, configure, and optimize Linux servers, drive automated deployment and configuration management, mentor junior engineers, and ensure security compliance with DISA STIGs across

Qualifications

• High School Diploma / GED with 11+ years of related IT experience.
• Associate's degree with 9+ years of related IT experience.
• Bachelor's degree with 7+ years of related IT experience.
• Master's degree with 5+ years of related IT experience.

Responsibilities

• Install, configure, and manage UNIX variants, with a heavy emphasis on Red Hat Linux server operating systems and middleware.
• Provide mentorship to junior administrators and technical staff as a senior resource.
• Manage automated installation, build, deployment, and configuration management frameworks.
• Write and utilize scripts to automate tasks using Bash, Python, PowerShell, Ruby, or Perl.
• Build, maintain, and support clustered, scalable, high-availability systems including load balancers and virtualization.
• Apply TCP/IP, firewall, routing, and VLAN concepts to troubleshoot networks and system issues.
• Utilize enterprise monitoring tools for event and performance monitoring; perform capacity planning.
• Harden systems using DISA STIGs and manage IAM configurations for security compliance.
• Plan and execute operating system upgrades and migrations with minimal mission impact.

Skills

Linux administration

Automation

Scripting

High availability

Networking

Performance monitoring

Security compliance

System lifecycle management

Mentorship

Education

High School Diploma or GED

Associate's degree

Bachelor's degree

Master's degree

Tools

ACAS

Windows administration

Database technologies

Job description

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, automated build and deployment, and automated 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

• 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

• 401(k)
• 401(k) matching
• Employee assistance program
• Flexible spending account
• Health insurance
• Life insurance
• Paid time off
• Parental leave
• Referral program
• Vision insurance

Work Location

In person