Linux System Administrator with Security Clearance

Aspen Consulting Group is currently seeking a skilled Linux System Administrator to join our team and support mission-critical infrastructure in a dynamic environment. This role involves managing Red Hat Enterprise Linux systems that drive high-performance workloads, including GPU development, and ensuring secure, stable, and efficient operations. The ideal candidate will bring expertise in Linux administration, automation, and system security, with a willingness to support networking hardware and infrastructure expansion. This is a cleared full-time position on-site at Aberdeen Proving Ground (APG), Maryland. Key Responsibilities

• Administer Linux / RHEL systems and for development, optimizing performance, reliability, and security in compute-intensive environments.
• Maintain PXE boot and Cobbler infrastructure for efficient system provisioning, imaging, and bare-metal deployments.
• Develop automation scripts and Ansible playbooks to streamline configuration management, software deployments, and routine administrative tasks.
• Configure and manage local storage solutions, including partitions and logical volumes, ensuring scalable and resilient storage performance.
• Manage user accounts and access controls through Identity Management (IdM), maintaining compliance and operational efficiency.
• Implement and maintain system security policies, including firewall configurations, SELinux rules, and file access controls (fapolicy), to protect against vulnerabilities and unauthorized access.
• Perform container management tasks in support of development and production workloads, using tools such as Podman or Docker.
• Support Allied Telesis and Arista switches, assisting in the management of network hardware to ensure reliable connectivity and performance.
• Assist with purchasing decisions for new equipment, providing technical insight and recommendations to guide future infrastructure growth. Qualifications
• Active TS / SCI clearance with CI Poly required.
• Security+ (Above baseline and computing environment certifications)
• Strong troubleshooting, problem-solving, and communication skills.
• Proven experience as a Linux or RHEL System Administrator, preferably in enterprise or research environments.
• Red Hat (RHCSA, RHCE) Linux Certification with minimum 5 years of UNIX platform experience.
• Strong background in automation, scripting, and Ansible.
• Ability to write Python scripts using REST / APIs with secure TLS and use of public key cryptography (certificates).
• Basic knowledge, understanding and experiencing configuring or administering to any of the following : nftables, “Iptables”, firewalld, or any other web-based firewall application.
• Some experience and knowledge on system compliance, patching, maintenance, and security.
• Hands-on knowledge of PXE boot, Cobbler, and system provisioning practices.
• Familiarity with Allied Telesis and Arista switch management a plus. About our Company

Since 2001, Aspen Consulting Group has been recognized for our expert knowledge in hardware design and fabrication, software development, information operations, systems engineering, development, integration, and testing. ACG has offices in central NJ and an on-site presence at APG, MD and JB-MDL, NJ. About our Benefits

Aspen Consulting Group offers an excellent benefits package! The company currently pays 100% of employee medical, dental, and vision premiums and funds a Health Reimbursement Account (HRA) that covers initial out of pocket costs. Summary of Coverage