Linux Systems Admin — Cybersecurity Compliance (A&D)

ATR International; San Jose (CA); Hybrid; USD 120,000 - 150,000; Full time

Job summary

ATR International seeks a Linux Systems Administrator with a strong cybersecurity compliance background for hybrid work in San Jose, CA. The role focuses on securing Linux infrastructure and ensuring compliance with NIST 800-171, CMMC, DFARS, and ITAR-related controls.

You will harden systems, manage patches, and support audits while collaborating with IT security, engineering, and program teams to meet export control and data handling requirements.

Qualifications

• 3–5+ years of Linux system administration experience.
• Experience with cybersecurity compliance frameworks (NIST 800-171, CMMC, RMF, or similar).
• Experience in aerospace, defense, or ITAR-regulated environments.
• Familiarity with STIG/CIS hardening practices.
• Scripting in Bash or Python for automation.
• Strong understanding of network security fundamentals.
• Experience with Linux installation and deployment.

Responsibilities

• Administer, maintain, and troubleshoot Linux servers.
• Configure network interfaces and firewall rules across distros.
• Implement system hardening standards (CIS Benchmarks, STIGs).
• Support compliance audits for NIST 800-171, CMMC, DFARS.
• Monitor, patch, remediate, and manage POA&Ms.
• Collaborate with IT security, engineering, and program teams on export control and data handling.
• Maintain documentation of configurations, security controls, and audit evidence.
• Support incident response and security monitoring.
• Manage user access controls, LDAP and SMB/Samba, logging, and backups.

Skills

Linux system administration

Cybersecurity compliance

Bash/Python scripting

Network security fundamentals

System hardening

Education

Bachelor's degree in CS/InfoSec or equivalent

Tools

Ansible

Puppet

RHCSA/RHCE certification

Job description

ATR International seeks a Linux Systems Administrator with a strong cybersecurity compliance background for hybrid work in San Jose, CA. The role focuses on securing Linux infrastructure and ensuring compliance with NIST 800-171, CMMC, DFARS, and ITAR-related controls.

You will harden systems, manage patches, and support audits while collaborating with IT security, engineering, and program teams to meet export control and data handling requirements.