Senior Linux Systems Administrator – DoD Secret, Onsite

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

Benefits offered by this job

401(k)

401(k) matching

Employee assistance program

Flexible spending account

Health insurance

Life insurance

Paid time off

Parental leave

Referral program

Vision insurance

Job summary

Caelum Research Corporation seeks a Senior Linux Systems Administrator to support a critical DoD IT services contract on-site at Aberdeen Proving Ground, MD. You will lead Linux infrastructure, automation, and high-availability workloads.

The role requires deep RHEL expertise, strong scripting, and security hardening per STIGs, plus mentoring junior staff and ensuring mission continuity in production environments.

Qualifications

• Experience in Linux system administration in enterprise production environments.
• Strong scripting skills (bash, python, or similar) for automation.
• Experience with STIGs and security hardening for DoD/ government systems.
• Mentorship or lead experience is a plus.

Responsibilities

• Install, configure, and manage Red Hat Linux servers and middleware.
• Mentor junior admins and provide senior-level guidance.
• Automate deployment, configuration, and maintenance tasks.
• Maintain high-availability infrastructure and perform capacity planning.
• Troubleshoot network, storage, and performance issues.

Skills

Linux Administration

Automation

Scripting

High Availability

Networking

Education

Bachelor's Degree

Associate's Degree

High School Diploma / GED

Master's Degree

Tools

ACAS

RHEL

RHCSA/RHCE

Job description

Caelum Research Corporation seeks a Senior Linux Systems Administrator to support a critical DoD IT services contract on-site at Aberdeen Proving Ground, MD. You will lead Linux infrastructure, automation, and high-availability workloads.

The role requires deep RHEL expertise, strong scripting, and security hardening per STIGs, plus mentoring junior staff and ensuring mission continuity in production environments.