Security Engineer IV - Linux- HHS STIM

Job Description: Security Engineer IV – Linux Systems

Key Responsibilities

• Design, implement, maintain, and troubleshoot Red Hat Enterprise Linux (RHEL) Server environments (v8-v9).
• Develop and maintain advanced automation and scripting solutions (BASH, Perl, JavaScript, Python) to optimize operations and resolve issues.
• Administer and maintain enterprise Linux environments, including Ansible, RHEL Satellite, firewall configurations (NFTables/Firewalld/IPTables), DNS (ISC2 BIND), and Postfix/SMTP relay services.
• Ensure interoperability and integration between Linux/UNIX and Windows environments.
• Support container runtime environments such as Mirantis (formerly Docker) and cloud services like AWS.
• Implement and maintain GitLab for source control and automation processes.
• Develop, document, and maintain standard operating procedures, system designs, and configuration records.
• Provide technical leadership and mentoring to junior engineers, fostering knowledge transfer and best practices.
• Collaborate with cross-functional IT and security teams on enterprise infrastructure projects, providing guidance and support.
• Participate in 24/7/365 on-call rotation, providing timely resolution for critical incidents.
• Troubleshoot LAN/WAN connectivity, performance, and throughput issues across distributed environments.
• Ensure compliance with federal cybersecurity standards, including NIST 800-53 Rev. 5, CIS Controls, and DISA STIGs.

Required Qualifications

• Bachelor’s degree in Computer Science, Information Systems, Cybersecurity, or related field (or equivalent combination of education, certifications, and experience).
• 10+ years of professional experience in Linux/UNIX system administration, including Red Hat Enterprise Linux (v8-v9).
• Expertise in automation tools such as Ansible and RHEL Satellite.
• Hands-on experience with scripting languages (BASH, Python, Perl, JavaScript).
• Knowledge of DNS (BIND), SMTP relay, Linux clustering, NFSv3/v4, PXE boot, and SELinux.
• Experience with Mirantis Container Runtime (Docker), AWS cloud environments, and GitLab.
• Current Red Hat certification such as RHCSA, RHCE, or RHCA (one version release current or previous).
• Strong problem-solving, analytical, and troubleshooting skills, with ability to work independently and within teams.
• Ability to clearly communicate complex technical concepts to non-technical stakeholders.
• Demonstrated knowledge of federal security standards (CIS Controls, NIST 800-53, DISA STIGs).