Senior IT Systems Administrator (Linux Admin)

CHAOS Industries•El Segundo, CA

1d•Onsite

About The Position

CHAOS Industries is seeking a Senior IT Systems Administrator with deep Linux expertise to design, build, secure, and operate infrastructure used by engineering and program teams. The role is responsible for keeping Linux servers, services, and cloud workloads reliable, patched, and compliant in a defense environment. The administrator will serve as a technical lead for Linux systems engineering, set standards, own complex technical problems, mentor teammates, and partner with cybersecurity, service desk, engineering, and program teams. The role owns the Linux server environment, including architecture, configuration management, patching, monitoring, backup and recovery, and hardening. It also leads infrastructure projects such as platform migrations, new site standups, and environment consolidations. The role includes an on-call rotation and occasional after-hours maintenance windows for critical systems. Travel is minimal, up to roughly 10%, for occasional trips to company offices and new sites. Work is primarily sedentary at a computer, with occasional lifting of equipment up to 25 lbs and work in server or network rooms. The position requires U.S. person status for access to CUI and export-controlled data (ITAR/EAR).

Requirements

Bachelor’s degree in Information Technology, Computer Science, Information Systems, or another related field, or equivalent work experience.
7+ years of progressive experience administering enterprise Linux server environments such as RHEL, Rocky, CentOS, Ubuntu, or Debian.
Expert command-line and troubleshooting skills, with deep knowledge of systemd, networking, storage (LVM, file systems, NFS), and performance tuning.
Strong Bash and Python scripting and automation skills, and experience with configuration management tools such as Ansible.
Experience hardening Linux systems and remediating vulnerabilities in regulated environments, including SELinux, auditd, DISA STIG or CIS baselines, and NIST SP 800-171 or CMMC requirements.
Experience integrating Linux with enterprise identity services (Active Directory, LDAP, Kerberos, SSSD) and managing SSH, sudo, and privileged access.
Experience owning patch management, monitoring, backup, and disaster recovery, including restore testing and meeting recovery objectives.
Track record of leading infrastructure projects and mentoring other engineers, with strong documentation and communication skills.
U.S. person status, as required for access to CUI and export-controlled data (ITAR/EAR).

Nice To Haves

Experience running Linux in Azure, AWS, or Azure Government and Microsoft GCC High environments, including hybrid and multi-cloud designs.
Experience with containers and orchestration (Docker, Podman, or Kubernetes) and virtualization platforms such as KVM or VMware.
Linux or cloud certification such as RHCSA, RHCE, LFCS, or Azure or AWS Associate-level certification; security certification such as Security+ or CISSP.
Experience with infrastructure as code and CI/CD tooling such as Terraform, Git-based workflows, or pipelines.
Experience supporting CMMC, NIST 800-171, or FedRAMP assessments, and an active U.S. government security clearance or the ability to obtain one.

Responsibilities

Architect, administer, and maintain physical, virtual, and cloud Linux server environments, including provisioning, configuration, patching, monitoring, and lifecycle management across Red Hat-family and Debian-family distributions.
Design and maintain automation and configuration management using Ansible, shell, and Python to standardize builds, enforce configuration, and streamline patching, reporting, and routine administration.
Build and maintain hardened, standardized server images and templates aligned with security baselines such as DISA STIG and CIS benchmarks, including SELinux, auditd, and FIPS-validated cryptography where required.
Manage Linux storage and networking, including LVM, file systems, NFS, DNS, firewalls, and system tuning for performance and capacity.
Integrate Linux systems with enterprise identity services, including Active Directory, LDAP, Kerberos, and SSSD; enforce SSH key management, sudo policy, MFA, and privileged access controls.
Deploy and manage Linux workloads in virtualized and cloud environments, including Azure and AWS virtual machines, and support containerized workloads where applicable.
Serve as technical lead and final escalation point for complex incidents; perform root-cause analysis and drive permanent fixes.
Mentor and coach junior systems administrators and service desk staff, and set technical standards, best practices, and peer review for the team.
Lead infrastructure projects from planning through delivery, including platform migrations, site buildouts, and integration of newly acquired environments.
Own backup, disaster recovery, and business continuity design for Linux systems, including regular restore testing and recovery objectives.
Monitor system health, logs, and performance with centralized monitoring and logging tools; remediate vulnerabilities in partnership with cybersecurity.
Support compliance requirements such as CMMC, NIST SP 800-171, and FedRAMP by maintaining configuration documentation, logs, and access reviews, and providing audit evidence.
Review technical designs and changes, follow the change control process, and communicate maintenance windows and impacts to stakeholders.
Evaluate and recommend tools and technologies, and contribute to the infrastructure roadmap, capacity planning, and budget inputs.
Create and maintain system documentation, runbooks, and architecture diagrams.
Participate in an on-call rotation and occasional after-hours maintenance windows for critical systems.
Travel occasionally to company offices and new sites, up to roughly 10%.